[Federal Register Volume 89, Number 20 (Tuesday, January 30, 2024)]
[Rules and Regulations]
[Pages 5773-5794]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-01530]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 141

[EPA-HQ-OW-2023-0541; FRL-11620-01-OW]


Expedited Approval of Alternative Test Procedures for the 
Analysis of Contaminants Under the Safe Drinking Water Act; Analysis 
and Sampling Procedures

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

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SUMMARY: This action announces the Environmental Protection Agency's 
(EPA's) approval of alternative testing methods for use in measuring 
the levels of contaminants in drinking water to determine compliance 
with national primary drinking water regulations. The Safe Drinking 
Water Act authorizes EPA to approve the use of alternative testing 
methods through publication in the Federal Register. EPA is using this 
streamlined authority to make 93 additional methods available for 
analyzing drinking water samples. This expedited approach provides 
public water systems, laboratories, and primacy agencies with more 
timely access to new measurement techniques and greater flexibility in 
the selection of analytical methods, thereby reducing monitoring costs 
while maintaining public health protection.

DATES: This action is effective January 30, 2024.

ADDRESSES: EPA has established a docket for this action under Docket ID 
No. EPA-HQ-OW-2023-0541. All documents in the docket are listed on the 
https://www.regulations.gov website. Although listed in the index, some 
information is not publicly available, e.g., confidential business 
information (CBI) or other information whose disclosure is restricted 
by statute. Certain other material, such as copyrighted material, is 
not placed on the internet and will be publicly available only in hard 
copy form. Publicly available docket materials are available 
electronically through https://www.regulations.gov.

FOR FURTHER INFORMATION CONTACT: Teresa Wells, Technical Support 
Branch, Standards and Risk Management Division, Office of Ground Water 
and Drinking Water (MS 140), Environmental Protection Agency, 26 West 
Martin Luther King Drive, Cincinnati, OH 45268; telephone number: (513) 
569-7128; email address: [email protected].

[[Page 5774]]


SUPPLEMENTARY INFORMATION:

I. General Information

A. Does this action apply to me?

    Public water systems are the regulated entities required to measure 
contaminants in drinking water samples. In addition, EPA Regions as 
well as States and Tribal governments with authority to administer the 
regulatory program for public water systems under the Safe Drinking 
Water Act (SDWA) may measure contaminants in water samples. When EPA 
sets a monitoring requirement in its national primary drinking water 
regulations for a given contaminant, the agency also establishes (in 
the regulations) standardized test procedures for analysis of the 
contaminant. This action makes alternative testing methods available 
for particular drinking water contaminants beyond the testing methods 
currently established in the regulations. EPA is providing public water 
systems, required to test water samples, with a choice of using either 
a test procedure already established in the existing regulations or an 
alternative testing method that has been approved in this action or in 
prior expedited approval actions. Categories and entities that may 
ultimately be affected by this action include:

------------------------------------------------------------------------
                                 Examples of potentially
            Category                regulated entities       NAICS \1\
------------------------------------------------------------------------
State, local, & Tribal           State, local, and                924110
 governments.                     Tribal governments
                                  that analyze water
                                  samples on behalf of
                                  public water systems
                                  required to conduct
                                  such analysis; State,
                                  local, and Tribal
                                  governments that
                                  directly operate
                                  community and non-
                                  transient non-
                                  community water
                                  systems required to
                                  monitor.
Industry.......................  Private operators of             221310
                                  community and non-
                                  transient non-
                                  community water
                                  systems required to
                                  monitor.
Municipalities.................  Municipal operators of           924110
                                  community and non-
                                  transient non-
                                  community water
                                  systems required to
                                  monitor.
------------------------------------------------------------------------
\1\ North American Industry Classification System.

    This table is not intended to be exhaustive, but rather provides a 
guide for readers regarding entities likely to be interested in this 
action. Other types of entities not listed in the table could also have 
some interest. To determine whether your facility is affected by this 
action, you should carefully examine the applicability language in the 
Code of Federal Regulations (CFR) at 40 CFR 141.2 (definition of a 
public water system). If you have questions regarding the applicability 
of this action to a particular entity, consult the person listed in the 
preceding FOR FURTHER INFORMATION CONTACT section.

Abbreviations and Acronyms Used in This Action

CFR: Code of Federal Regulations
EPA: United States Environmental Protection Agency
NAICS: North American Industry Classification System
QC: Quality Control
SDWA: The Safe Drinking Water Act
VCSB: Voluntary Consensus Standard Bodies

II. Background

A. What is the purpose of this action?

    In this action, EPA is approving 93 analytical methods for 
determining contaminant concentrations in drinking water samples 
collected under SDWA. Regulated entities required to sample and monitor 
may use either the testing methods already established in existing 
regulations or the alternative testing methods being approved in this 
action or in prior expedited approval actions. The new methods are 
listed along with other methods similarly approved through previous 
expedited actions in 40 CFR part 141, appendix A to subpart C and on 
EPA's drinking water methods website at https://www.epa.gov/dwanalyticalmethods.

B. What is the basis for this action?

    When EPA determines that an alternative analytical method is 
``equally effective'' (i.e., as effective as a method that has already 
been promulgated in the regulations), SDWA allows EPA to approve the 
use of the alternative testing method through publication in the 
Federal Register (see section 1401(1) of SDWA). EPA is using this 
streamlined approval authority to make 93 additional methods available 
for determining contaminant concentrations in drinking water samples 
collected under SDWA. EPA has determined that, for each contaminant or 
group of contaminants listed in section III of this preamble, the 
additional testing methods being approved in this action are as 
effective as one or more of the testing methods already approved in the 
regulations for those contaminants. Section 1401(1) of SDWA states that 
the newly approved methods ``shall be treated as an alternative for 
public water systems to the quality control and testing procedures 
listed in the regulation.'' Accordingly, this action makes these 
additional 93 analytical methods legally available as options for 
meeting EPA's monitoring requirements.
    This action does not add regulatory language, but does, for 
informational purposes, update an appendix to the regulations at 40 CFR 
part 141 that lists all methods approved under section 1401(1) of SDWA. 
Accordingly, while this action is not a rule, it is updating CFR text 
and therefore is being published in the ``Final Rules'' section of the 
Federal Register.

III. Summary of Approvals

    EPA is approving 93 methods that are equally effective relative to 
methods previously promulgated in the regulations. By means of this 
action, these 93 methods are added to appendix A to subpart C of 40 CFR 
part 141.

A. Methods Developed by Voluntary Consensus Standard Bodies (VCSB)

    1. ASTM International. EPA compared the most recent version of one 
ASTM International method for determination of radium-226 by radon 
emanation to the earlier version of the method that is currently 
approved in 40 CFR 141.25(a). Changes between the earlier approved 
version and the most recent version of the method are described more 
fully in Smith 2023. The revisions involve primarily editorial changes 
(e.g., updated references, definitions, terminology, procedural 
clarifications, and reorganization of text). The revised method is the 
same as the approved version with respect to sample collection and 
handling protocols, sample preparation, analytical methodology, and 
method performance data; thus, EPA finds it is equally effective 
relative to the approved method.
    EPA is thus approving the use of the following ASTM method for 
radium-226 as listed in the following table:

[[Page 5775]]



----------------------------------------------------------------------------------------------------------------
       ASTM revised version            Approved method          Contaminant            Regulation citation
----------------------------------------------------------------------------------------------------------------
D 3454-21 (ASTM 2021).............  D 3454-97 (ASTM 1997)  Radium-226..........  40 CFR 141.25(a).
----------------------------------------------------------------------------------------------------------------

    The ASTM method is available from ASTM International, 100 Barr 
Harbor Drive, West Conshohocken, PA 19428-2959 or https://www.astm.org.
    2. Standard Methods for the Examination of Water and Wastewater 
(Standard Methods). The 24th edition of Standard Methods for the 
Examination of Water and Wastewater (APHA 2023) was published in 2023. 
EPA compared 90 methods in the 24th edition to earlier versions of 
those methods that are currently approved in 40 CFR parts 141 and 143. 
Changes between the approved version and the version of each method 
published in the 24th edition are summarized in Smith and Wendelken 
(2023) and Best (2023). The revisions primarily involve editorial 
changes (e.g., correction of errors, procedural clarifications and 
reorganization of text). The methods in the following table are the 
same as the earlier approved versions with respect to the sample 
handling protocols, analytical procedures and method performance data. 
For these reasons, EPA has concluded that the versions in the 24th 
edition are equally effective relative to the currently approved 
versions in the regulations. Therefore, EPA is approving the use of 90 
Standard Methods in the 24th edition for the contaminants and their 
respective regulations listed in the following table:

----------------------------------------------------------------------------------------------------------------
 Standard methods, 24th edition (APHA
                2023)                      Approved method            Contaminant          Regulation citations
----------------------------------------------------------------------------------------------------------------
2120 B...............................  2120 B-01, online        Color..................  40 CFR 143.4(b).
                                        version (APHA 2001a).
2130 B...............................  2130 B-01, online        Turbidity..............  40 CFR 141.74(a)(1).
                                        version (APHA 2001b).
2150 B...............................  2150 B-97, online        Odor...................  40 CFR 143.4(b).
                                        version (APHA 1997a).
2320 B...............................  2320 B-97, online        Alkalinity.............  40 CFR 141.23(k)(1).
                                        version (APHA 1997b).
2510 B...............................  2510 B-97, online        Conductivity...........  40 CFR 141.23(k)(1).
                                        version (APHA 1997c).
2540 C...............................  2540 C-97, online        Total Dissolved Solids.  40 CFR 143.4(b).
                                        version (APHA 1997d).
2550.................................  2550-00, online version  Temperature............  40 CFR 141.23(k)(1).
                                        (APHA 2000a).
3111 B...............................  3111 B-99, online        Calcium, copper,         40 CFR 141.23(k)(1); 40
                                        version (APHA 1999a).    magnesium, nickel,       CFR 143.4(b).
                                                                 sodium, iron,
                                                                 manganese, silver,
                                                                 zinc.
3111 D...............................  3111 D-99, online        Barium, aluminum.......  40 CFR 141.23(k)(1); 40
                                        version (APHA 1999a).                             CFR 143.4(b).
3112 B...............................  3112 B-99, online        Mercury................  40 CFR 141.23(k)(1).
                                        version (APHA 1999b).
3113 B...............................  3113 B, 19th Edition     Antimony, arsenic,       40 CFR 141.23(k)(1); 40
                                        (APHA 1995).             barium, beryllium,       CFR 143.4(b).
                                                                 cadmium, chromium,
                                                                 copper, lead, nickel,
                                                                 selenium, aluminum,
                                                                 iron, manganese,
                                                                 silver.
3114 B...............................  3114 B-97, online        Arsenic, selenium......  40 CFR 141.23(k)(1).
                                        version (APHA 1997e).
3120 B...............................  3120 B-99, online        Barium, beryllium,       40 CFR 141.23(k)(1); 40
                                        version (APHA 1999c).    calcium, chromium,       CFR 143.4(b).
                                                                 copper, magnesium,
                                                                 nickel, silica,
                                                                 aluminum, iron,
                                                                 manganese, silver,
                                                                 zinc.
3500-Ca B............................  3500-Ca B-97, online     Calcium................  40 CFR 141.23(k)(1).
                                        version (APHA 1997f).
3500-Mg B............................  3500-Mg B-97, online     Magnesium..............  40 CFR 141.23(k)(1).
                                        version (APHA 1997g).
4110 B...............................  4110 B-00, online        Fluoride, nitrate,       40 CFR 141.23(k)(1); 40
                                        version (APHA 2000b).    nitrite, ortho-          CFR 143.4(b).
                                                                 phosphate, chloride,
                                                                 sulfate.
4500-Cl D,F,G,H......................  4500-Cl D,F,G,H-00,      Free chlorine..........  40 CFR 141.74(a)(2); 40
                                        online versions (APHA                             CFR 141.131(c)(1).
                                        2000c).
4500-Cl D,E,F,G,I....................  4500-Cl D,E,F,G,I-00,    Total chlorine.........  40 CFR 141.74(a)(2); 40
                                        online versions (APHA                             CFR 141.131(c)(1).
                                        2000c).
4500-Cl D,F,G........................  4500-Cl D,F,G-00,        Combined chlorine......  40 CFR 141.131(c)(1).
                                        online versions (APHA
                                        2000c).
4500-Cl-B,D..........................  4500-Cl-B,D-97, online   Chloride...............  40 CFR 143.4(b).
                                        versions (APHA 1997h).
4500-ClO2 C..........................  4500-ClO2 C-00, online   Chlorine dioxide.......  40 CFR 141.74(a)(2).
                                        version (APHA 2000d).
4500-ClO2 E..........................  4500-ClO2 E-00, online   Chlorine dioxide.......  40 CFR 141.74(a)(2); 40
                                        version (APHA 2000d).                             CFR 141.131(c)(1).
4500-ClO2 E..........................  4500-ClO2 E-00, online   Chlorite...............  40 CFR 141.131(b)(1).
                                        version (APHA 2000d).
4500-CN-C,E,F,G......................  4500-CN-C,E,F,G, 20th    Cyanide................  40 CFR 141.23(k)(1).
                                        Edition (APHA 1998).
4500-F-B,C,D,E.......................  4500-F-B,C,D,E-97,       Fluoride...............  40 CFR 141.23(k)(1).
                                        online versions (APHA
                                        1997i).

[[Page 5776]]

 
4500-H\+\ B..........................  4500-H\+\ B-00, online   pH.....................  40 CFR 141.23(k)(1).
                                        version (APHA 2000e).
4500-NO3-D...........................  4500-NO3-D-00, online    Nitrate................  40 CFR 141.23(k)(1).
                                        version (APHA 2000f).
4500-NO3-E,F.........................  4500-NO3-E,F-00, online  Nitrate, nitrite.......  40 CFR 141.23(k)(1).
                                        versions (APHA 2000f).
4500-NO2-B...........................  4500-NO2-B-00, online    Nitrite................  40 CFR 141.23(k)(1).
                                        version (APHA 2000g).
4500-O3 B............................  4500-O3 B-97, online     Ozone..................  40 CFR 141.74(a)(2).
                                        version (APHA 1997j).
4500-P E,F...........................  4500-P E,F, 19th         Ortho-phosphate........  40 CFR 141.23(k)(1).
                                        Edition, (APHA 1995).
4500-SiO2 C,D,E......................  4500-SiO2 C,D,E-97,      Silica.................  40 CFR 141.23(k)(1).
                                        online versions (APHA
                                        1997k).
4500-SO4\2\-C,D,E,F..................  4500-SO4\2\-C,D,E,F,     Sulfate................  40 CFR 143.4(b).
                                        19th Edition (APHA
                                        1995).
5310 B,C.............................  5310 B,C-00, online      Dissolved and Total      40 CFR 141.131(d).
                                        versions (APHA 2000h).   Organic Carbon.
5540 C...............................  5540 C-00, online        Foaming agents.........  40 CFR 143.4(b).
                                        version (APHA 2000i).
5910 B...............................  5910 B-00, online        UV Absorption at 254 nm  40 CFR 141.131(d).
                                        version (APHA 2000j).
6251 B...............................  6251 B-94, online        HAA5...................  40 CFR 141.131(b)(1).
                                        version (APHA 1994).
6610 B...............................  EPA Method 531.2, Rev.   Carbofuran, oxamyl.....  40 CFR 141.24(e)(1).
                                        1.0 (USEPA 2001).
6640 B...............................  EPA Method 515.4, Rev.   2,4-D; 2,4,5-TP;         40 CFR 141.24(e)(1).
                                        1.0 (USEPA 2000).        Dalapon; Dinoseb;
                                                                 Pentachlorophenol;
                                                                 Picloram.
6651 B...............................  6651 B, 20th Edition,    Glyphosate.............  40 CFR 141.24(e)(1).
                                        (APHA 1998).
7110 B...............................  7110 B-00, online        Gross alpha and gross    40 CFR 141.25(a).
                                        version (APHA 2000k).    beta.
7110 C...............................  7110 C-00, online        Gross alpha............  40 CFR 141.25(a).
                                        version (APHA 2000k).
7110 D...............................  EPA Method 900.0 (USEPA  Gross alpha and gross    40 CFR 141.25(a).
                                        1980).                   beta.
7120.................................  7120-97, online version  Gamma emitters           40 CFR 141.25(a).
                                        (APHA 1997l).            (includes radioactive
                                                                 cesium and iodine).
7500-Cs B............................  7500-Cs B-00, online     Radioactive Cesium and   40 CFR 141.25(a).
                                        version (APHA 2000l).    Gamma emitters.
7500-\3\H B..........................  7500-\3\H B-00, online   Tritium................  40 CFR 141.25(a).
                                        version (APHA 2000m).
7500-I B.............................  7500-I B-00, online      Radioactive Iodine and   40 CFR 141.25(a).
                                        version (APHA 2000n).    Gamma emitters.
7500-I C,D...........................  7500-I C,D-00, online    Radioactive Iodine.....  40 CFR 141.25(a).
                                        versions (APHA 2000n).
7500-Ra B,C..........................  7500-Ra B,C-01, online   Radium-226.............  40 CFR 141.25(a).
                                        versions (APHA 2001c).
7500-Ra D............................  7500-Ra D-01, online     Radium-228.............  40 CFR 141.25(a).
                                        version (APHA 2001c).
7500-Ra E............................  GA Method (2004).......  Radium-226 and Radium-   40 CFR 141.25(a).
                                                                 228.
7500-Sr B............................  7500-Sr B-01, online     Strontium-89 and         40 CFR 141.25(a).
                                        version (APHA 2001d).    Strontium-90.
7500-U B,C...........................  7500-U B,C-00, online    Uranium................  40 CFR 141.25(a).
                                        versions (APHA 2000o).
9221 A,C.............................  9221 A,C, 20th Edition,  Total coliforms........  40 CFR 141.74(a)(1).
                                        (APHA 1998).
9221 B...............................  9221 B, 20th Edition,    Total coliforms........  40 CFR 141.74(a)(1) 40
                                        (APHA 1998).                                      CFR 141.852(a)(5)
                                                                                          [B.1, B.2, B.3, B.4].
9221 D...............................  9221 D, 20th Edition,    Total coliforms........  40 CFR 141.852(a)(5)
                                        (APHA 1998).                                      [D.1, D.2, D.3].
9221 E...............................  9221 E, 20th Edition,    Fecal coliforms........  40 CFR 141.74(a)(1).
                                        (APHA 1998).
9221 F...............................  9221 F, 20th Edition,    E. coli................  40 CFR 141.402(c)(2) 40
                                        (APHA 1998).                                      CFR 141.852(a)(5)
                                                                                          [F.1].
9222 A...............................  9222 A 20th Edition,     Total coliforms........  40 CFR 141.74(a)(1).
                                        (APHA 1998).
9222 B,C.............................  9222 B,C, 20th Edition,  Total coliforms........  40 CFR 141.74(a)(1) 40
                                        (APHA 1998).                                      CFR 141.852(a)(5).
9222 D...............................  9222 D, 20th Edition,    Fecal coliforms........  40 CFR 141.74(a)(1).
                                        (APHA 1998).
9222 H...............................  9222 G, 20th Edition,    E. coli................  40 CFR 141.852(a)(5).
                                        (APHA 1998).
9222 I...............................  9222 G, 20th Edition,    E. coli................  40 CFR 141.402(c)(2) 40
                                        (APHA 1998).                                      CFR 141.852(a)(5).
9222 J...............................  m-ColiBlue24 Test (Hach  Total coliforms........  40 CFR 141.852(a)(5).
                                        Company 1999).
9222 J...............................  m-ColiBlue24 Test (Hach  E. coli................  40 CFR 141.402(c)(2) 40
                                        Company 1999).                                    CFR 141.852(a)(5).
9223 B...............................  9223 B, 20th Edition     Total coliforms........  40 CFR 141.74(a)(1); 40
                                        (APHA 1998).                                      CFR 141.852(a)(5).

[[Page 5777]]

 
9223 B...............................  9223 B, 20th Edition     E. coli................  40 CFR 141.402(c)(2);
                                        (APHA 1998).                                      40 CFR 141.852(a)(5).
9230 B...............................  9230 C, 20th Edition     Enterococci............  40 CFR 141.402(c)(2).
                                        (APHA 1998).
9230 C...............................  9230 C, 20th Edition     Enterococci............  40 CFR 141.402(c)(2).
                                        (APHA 1998).
9230 D...............................  (Budnick 1996).........  Enterococci............  40 CFR 141.402(c)(2).
----------------------------------------------------------------------------------------------------------------

    The 24th edition can be obtained from the American Public Health 
Association (APHA), 800 I Street NW, Washington, DC 20001-3710. 
Approved online versions are available at http://www.standardmethods.org.

B. Methods Developed by Vendors

    1. Hach Method 10312--Spectrophotometric Measurement of Fluoride in 
Finished Drinking Water Aluminum-Chromeazurol S complex (AL-CAS) Using 
Planar Reagent-filled Cuvettes (Hach 2022a). Hach Method 10312 uses a 
reagent solution containing an intensely colored aluminum-chromeazurol 
S complex. The presence of fluoride in the sample removes aluminum from 
the complex, releasing the free chromeazurol S ion. The free 
chromeazurol S ion has peak absorbance in a different region of the 
visible spectrum. The quantifiable change in absorbance is directly 
proportional to the fluoride concentration. Test results are measured 
at 427 nm using a colorimeter.
    Approved methods for fluoride are listed at 40 CFR 141.23(k)(1). 
The performance characteristics of Hach Method 10312 were compared to 
the performance characteristics of the approved Standard Methods 4500-F 
D (Standard Methods 1997i). The validation study report (Hach 2022b) 
summarizes the results obtained from three different facilities and 
laboratories. Method detection limits and method limits, precision and 
accuracy performance in high and low ionic strength water, and matrix 
spike studies were determined at all sites.
    EPA has determined that Hach Method 13012 is equally effective 
relative to Standard Methods 4500-F D. The basis for this determination 
is discussed in Adams 2023a. Therefore, EPA is approving the Hach 
Method 10312 for determining fluoride in drinking water. A copy of the 
method is available from Hach Company, 5600 Lindbergh Drive, Loveland, 
Colorado 80539.
    2. Yokogawa Method 820--Measurement of Turbidity in Drinking Water 
by Right Angle Scattered Light Turbidity Analyzer (Yokogawa 2022a). 
Yokogawa Method 820 uses a right-angle scattering turbidimeter with an 
LED light source with a peak emitting wavelength between 650 and 670 
nm. The method is based upon a comparison of the intensity of light 
scattered by the sample under defined conditions with the intensity of 
light scattered by a standard reference suspension.
    Approved methods for turbidity are listed at 40 CFR 141.74(a)(1). 
The performance characteristics of the Yokogawa Method 820 were 
compared to the performance characteristics of the approved EPA Method 
180.1 (USEPA 1993). The validation study report (Yokogawa 2022b) 
summarizes the results obtained from the turbidimeters tested at three 
different utilities. Method resolution, linearity, limits of detection, 
and precision and accuracy were determined at the first site, with 
subsequent sites evaluating precision and accuracy performance.
    EPA has determined that the Yokogawa Method 820 is equally 
effective relative to EPA Method 180.1. The basis for this 
determination is discussed in Adams 2023b. Therefore, EPA is approving 
the Yokogawa Method 820 for determining turbidity in drinking water. A 
copy of the method is available from Yokogawa Electric Corporation, 2-
9-32 Nakamachi, Musashino-shi, Tokyo, Japan 180-8750.

IV. Statutory and Executive Order Reviews

    As noted in section II of this preamble, under the terms of SDWA 
section 1401(1), this streamlined method approval action is not a rule. 
Accordingly, the Congressional Review Act, 5 U.S.C. 801 et seq., as 
added by the Small Business Regulatory Enforcement Fairness Act of 
1996, does not apply because this action is not a rule for purposes of 
5 U.S.C. 804(3). Similarly, this action is not subject to the 
Regulatory Flexibility Act because it is not subject to notice and 
comment requirements under the Administrative Procedure Act or any 
other statute. In addition, because this approval action is not a rule, 
but simply makes alternative testing methods available as options for 
monitoring under SDWA, EPA has concluded that other statutes and 
executive orders generally applicable to rulemaking do not apply to 
this approval action.

V. References

Adams, W. 2023a. Memo to the record describing basis for expedited 
approval of Hach Method 10312. May 9, 2023. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.)
Adams, W. 2023b. Memo to the record describing basis for expedited 
approval of Yokogawa Method 820. May 9, 2023. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.)
American Public Health Association (APHA). 1994. Standard Method 
6251 B-94. Disinfection By-Products: Haloacetic Acids and 
Trichlorophenol. B. Micro Liquid-Liquid Extraction Gas 
Chromatographic Method. Approved by Standard Methods Committee 1994. 
Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Associate (APHA). 1995. 19th Edition of 
Standard Methods for the Examination of Water and Wastewater. 
American Public Health Association, 800 I Street NW, Washington, DC 
20001-3710.
American Public Health Association (APHA). 1997a. Standard Method 
2150 B-97. Odor. B. Threshold Odor Test. Approved by Standard 
Methods Committee 1997. Standard Methods Online (Available at 
https://www.standardmethods.org)
American Public Health Association (APHA). 1997b. Standard Method 
2320 B-97. Alkalinity. B. Titration Method. Approved by Standard 
Methods Committee 1997. Standard Methods Online (Available at 
https://www.standardmethods.org)
American Public Health Association (APHA). 1997c. Standard Method 
2510 B-97. Conductivity. B. Laboratory Method. Approved by Standard 
Methods Committee 1997. Standard Methods Online (Available at 
https://www.standardmethods.org)
American Public Health Association (APHA). 1997d. Standard Method 
2540 C-97. Solids. C. Total Dissolved Solids Dried at 180 [deg]C. 
Approved by Standard Methods Committee 1997. Standard Methods Online 
(Available at https://www.standardmethods.org)
American Public Health Association (APHA). 1997e. Standard Method 
3114 B-97. Arsenic and Selenium by Hydride Generation/Atomic 
Emission Spectrometry. B. Manual Hydride Generation/Atomic 
Absorption

[[Page 5778]]

Spectrometric Method. Approved by Standard Methods Committee 1997. 
Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 1997f. Standard Method 
3500-Ca B-97. Calcium. B. EDTA Titrimetric Method. Approved by 
Standard Methods Committee 1997. Standard Methods Online (Available 
at https://www.standardmethods.org)
American Public Health Association (APHA). 1997g. Standard Method 
3500-Mg B-97. Magnesium. B. Calculation Method. Approved by Standard 
Methods Committee 1997. Standard Methods Online (Available at 
https://www.standardmethods.org)
American Public Health Association (APHA). 1997h. Standard Methods 
4500-Cl-B, D-97. Chloride. B. Argentometric Method. D. 
Potentiometric Method. Approved by Standard Methods Committee 1997. 
Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 1997i. Standard Methods 
4500-F-B, C, D, E-97. Fluoride. B. Preliminary 
Distillation Step. C. Ion-Selective Electrode Method. D. SPADNS 
Method. E. Complexone Method. Approved by Standard Methods Committee 
1997. Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 1997j. Standard Method 
4500-O3 B-97. Ozone (Residual). B. Indigo Colorimetric 
Method. Approved by Standard Methods Committee 1997. Standard 
Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 1997k. Standard Methods 
4500-SiO2 C, D, E-97. Silica. C. Molybdosilicate Method. 
D. Heteropoly Blue Method. E. Automated Method for Molybdate-
Reactive Silica. Approved by Standard Methods Committee 1997. 
Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 1997l. Standard Method 
7120 B-97. Gamma-Emitting Radionuclides. B. Gamma Spectroscopic 
Method. Approved by Standard Methods Committee 1997. Standard 
Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 1998. 20th Edition of 
Standard Methods for the Examination of Water and Wastewater. 
American Public Health Association, 800 I Street NW, Washington, DC 
20001-3710.
American Public Health Association (APHA). 1999a. Standard Methods 
3111 B, D-99. Metals by Flame Atomic Absorption Spectrometry. B. 
Direct Air-Acetylene Flame Method. D. Direct Nitrous Oxide-Acetylene 
Flame Method. Approved by Standard Methods Committee 1999. Standard 
Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 1999b. Standard method 
3112 B-99. Metals by Cold-Vapor Atomic Absorption Spectrometry. B. 
Cold-Vapor Spectrometric Method. Approved by Standard Methods 
Committee 1999. Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 1999c. Standard Method 
3120 B-99. Metals by Plasma Emission Spectroscopy. B. Inductively 
Coupled Plasma (ICP) Method. Approved by Standard Methods Committee 
1999. Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 1999d. Standard Method 
4500-CN-C-99. Cyanide. C. Total Cyanide after Distillation. Approved 
by Standard Methods Committee 1999. Standard Methods Online 
(Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000a. Standard Method 
2550-00. Temperature. Approved by Standard Methods Committee 2000. 
Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000b. Standard Method 
4110 B-00. Determination of Anions by Ion Chromatography. B. Ion 
Chromatography with Chemical Suppression of Eluent Conductivity. 
Approved by Standard Methods Committee 2000. Standard Methods Online 
(Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000c. Standard Methods 
4500-Cl D, E, F, G, H, I-00. Chlorine (Residual). D. Amperometric 
Titration Method. E. Low-Level Amperometric Titration Method. F. DPD 
Ferrous Titrimetric Method. G. DPD Colorimetric Method. H. 
Syringaldehyde (FACTS) Method. I. Iodometric Electrode Technique. 
Approved by Standard Methods Committee 2000. Standard Methods Online 
(Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000d. Standard Methods 
4500-ClO2 C, E-00. Chlorine Dioxide. C. Amperometric 
Method I. E. Amperometric Method II. Approved by Standard Methods 
Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000e. Standard Method 
4500-H\+\ B-00. pH Value. B. Electrometric Method. Approved by 
Standard Methods Committee 2000. Standard Methods Online (Available 
at https://www.standardmethods.org)
American Public Health Association (APHA). 2000f. Standard Methods 
4500-NO3-D, E, F-00. Nitrogen (Nitrate). D. Nitrate 
Electrode Method. E. Cadmium Reduction Method. F. Automated Cadmium 
Reduction Method. Approved by Standard Methods Committee 2000. 
Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000g. Standard Method 
4500-NO2-B-00. Nitrogen (Nitrite). B. Colorimetric 
Method. Approved by Standard Methods Committee 2000. Standard 
Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000h. Standard Methods 
5310 B, C-00. Total Organic Carbon (TOC). B. High Temperature 
Combustion Method. C. Persulfate-Ultraviolet or Heated Persulfate 
Oxidation Method. Approved by Standard Methods Committee 2000. 
Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000i. Standard Method 
5540 C-00. Surfactants. C. Anionic Surfactants as MBAs. Approved by 
Standard Methods Committee 2000. Standard Methods Online (Available 
at https://www.standardmethods.org)
American Public Health Association (APHA). 2000j. Standard Method 
5910 B-00. UV-Absorbing Organic Constituents. B. Ultraviolet 
Absorption Method. Approved by Standard Methods Committee 2000. 
Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000k. Standard Methods 
7110 B,C-00. Gross Alpha and Gross Beta Radioactivity (Total, 
Suspended, and Dissolved). B. Evaporation Method for Gross Alpha-
Beta. C. Coprecipitation Method for Alpha Radioactivity in Drinking 
Water. Approved by Standard Methods Committee 2000. Standard Methods 
Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000l. Standard Method 
7500-Cs B-00. Radioactive Cesium. B. Precipitation Method. Approved 
by Standard Methods Committee 2000. Standard Methods Online 
(Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000m. Standard Method 
7500-\3\H B-00. Tritium. Liquid Scintillation Spectrometric Method. 
Approved by Standard Methods Committee 2000. Standard Methods Online 
(Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2000n. Standard Methods 
7500-I B, C, D-00. Radioactive Iodine. B. Precipitation Method. C. 
Ion-Exchange Method. D. Distillation Method. Approved by Standard 
Methods Committee 2000. Standard Methods Online (Available at 
https://www.standardmethods.org)
American Public Health Association (APHA). 2000o. Standard Methods 
7500-U B, C-00. Uranium. B. Radiochemical Method. C. Isotopic 
Method. Approved by Standard Methods Committee 2000. Standard 
Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2001a. Standard Method 
2120 B-01. Color. B. Visual Comparison Method. Approved by Standard 
Methods Committee 2001. Standard Methods Online (Available at 
https://www.standardmethods.org)
American Public Health Association (APHA). 2001b. Standard Method 
2130 B-01.

[[Page 5779]]

Turbidity. B. Nephelometric Method. Approved by Standard Methods 
Committee 2001. Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2001c. Standard Methods 
7500-Ra B, C, D, E-01. Radium. B. Precipitation Method. C. Emanation 
Method. D. Sequential Precipitation. E. Gamma Spectroscopy Method. 
Approved by Standard Methods Committee 2001. Standard Methods Online 
(Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2001d. Standard Method 
7500-Sr B-01. Total Radioactive Strontium and Strontium-90. B. 
Precipitation Method. Approved by Standard Methods Committee 2000. 
Standard Methods Online (Available at https://www.standardmethods.org)
American Public Health Association (APHA). 2023. 24th Edition of 
Standard Methods for the Examination of Water and Wastewater. 
American Public Health Association, 800 I Street NW, Washington, DC 
20001-3710.
ASTM International. 1997. ASTM D 3454-97. Standard Test Method for 
Radium-226 in Water. ASTM International, 100 Barr Harbor Drive, West 
Conshohocken, PA 19428-2959. (Available at https://www.astm.org.)
ASTM International. 2021. ASTM D 3454-21. Standard Test Method for 
Radium-226 in Water. ASTM International, 100 Barr Harbor Drive, West 
Conshohocken, PA 19428-2959. (Available at https://www.astm.org.)
Best, J. 2023. Memo to the record describing basis for expedited 
approval of methods in the 24th edition of Standard Methods for the 
Examination of Water and Wastewater. August 10, 2023. (Available at 
https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.)
Budnick. 1996. Evaluation of Enterolert for Enumeration of 
Enterococci in Recreational Waters, Applied and Environmental 
Microbiology, October 1996, p. 3881-3884.
GA. 2004. Method for the Determination of Radium-228 and Radium-226 
in Drinking Water by Gamma-ray Spectrometry using HPGE or Ge(Li) 
Detectors. December 2004. Revision 1.2. Environmental Resource 
Center, Georgia Institute for Technology, 620 Cherry Street, 
Atlanta, Georgia 30332-0335. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.)
Hach Company. 2022a. Hach Method 10312. Spectrophotometric 
Measurement of Fluoride in Finished Drinking Water Aluminum-
Chromeazurol S complex (AL-CAS) Using Planar Reagent-filled 
Cuvettes. August 2022. Revision 1.0. Hach Company, 5600 Lindbergh 
Drive, Loveland, Colorado 80539. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.)
Hach Company. 2022b. Alternate Test Procedure (ATP) Validation Study 
Report of Hach Method 10312 for the Determination of Fluoride in 
Finished Drinking Water Using Planar Reagent-filled Cuvettes. August 
2022. Hach Company, 5600 Lindbergh Drive, Loveland, Colorado 80539. 
(Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-
2023-0541.)
Hach Company. 1999. Total Coliforms and E. coli Membrane Filtration 
Method m-ColiBlue24[supreg] Broth. August 1999. Revision 2. Hach 
Company, 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. 
(Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-
2023-0541.)
Smith, G. 2023. Memo to the record describing basis for expedited 
approval of updated method from ASTM International. April 2023. 
(Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-
2023-0541.)
Smith, G. and Wendelken, S. 2023. Memo to the record describing 
basis for expedited approval of methods in the 24th edition of 
Standard Methods for the Examination of Water and Wastewater. June 
2023. (Available at https://www.regulations.gov; docket ID No. EPA-
HQ-OW-2023-0541.)
USEPA. 1980. EPA Method 904.0. Radium-228 in Drinking Water in 
``Prescribed Procedures for Measurement of Radioactivity in Drinking 
Water,'' EPA-600/4-80-032, August 1980. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.)
USEPA. 1993. EPA Method 180.1, Revision 2.0. Determination of 
Turbidity by Nephelometry in ``Methods for the Determination of 
Inorganic Substances in Environmental Samples,'' EPA/600/R-93/100, 
August 1993. (Available at https://www.regulations.gov; docket ID 
No. EPA-HQ-OW-2023-0541.)
USEPA. 2000. EPA Method 515.4, Revision 1.0. Determination of 
Chlorinated Acids in Drinking Water by Liquid-Liquid 
Microextraction, Derivatization and Fast Gas Chromatography with 
Electron Capture Detection. EPA/815/B-00/001. April 2000. (Available 
at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541 
and at https://www.nemi.gov.)
USEPA. 2001. EPA Method 531.2, Revision 1.0. Measurement of N-
methylcarbamoyloximes and N-methylcarbamates in Water by Direct 
Aqueous Injection HPLC with Postcolumn Derivatization. EPA 815-B-01-
002. September 2001. (Available at https://www.regulations.gov; 
docket ID No. EPA-HQ-OW-2023-0541 and at https://www.nemi.gov.)
Yokogawa Electric Corporation. 2022a. Yokogawa Method 820. 
Measurement of Turbidity in Drinking Water by Right Angle Scattered 
Light Turbidity Analyzer. November 30, 2022. Revision 1.0. Yokogawa 
Electric Corporation, 2-9-32 Nakamachi, Musashino-shi, Tokyo, Japan 
180-8750. (Available at https://www.regulations.gov; docket ID No. 
EPA-HQ-OW-2023-0541.)
Yokogawa Electric Corporation. 2022b. Alternate Test Procedure (ATP) 
Validation Study Report of Yokogawa Method 820 for the Measurement 
of Turbidity in Drinking Water by Right Angle Scattered Light 
Turbidity Analyzer. November 8, 2022. Yokogawa Electric Corporation, 
2-9-32 Nakamachi, Musashino-shi, Tokyo, Japan 180-8750. (Available 
at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.)

List of Subjects in 40 CFR Part 141

    Environmental protection, Chemicals, Indians--lands, 
Intergovernmental relations, Reporting and recordkeeping requirements, 
Water supply.

Jennifer L. McLain,
Director, Office of Ground Water and Drinking Water.

    For the reasons stated in the preamble, the Environmental 
Protection Agency amends 40 CFR part 141 as follows:

PART 141--NATIONAL PRIMARY DRINKING WATER REGULATIONS

0
1. The authority citation for part 141 continues to read as follows:

    Authority:  42 U.S.C. 300f, 300g-1, 300g-2, 300g-3, 300g-4, 
300g-5, 300g-6, 300j-4, 300j-9, and 300j-11.


0
2. Amend Appendix A to subpart C of part 141 by:
0
a. Revising the table entitled ``Alternative Testing Methods for 
Contaminants Listed at 40 CFR 141.23(k)(1)'';
0
b. Revising the table entitled ``Alternative Testing Methods for 
Contaminants Listed at 40 CFR 141.24(e)(1)'';
0
c. Revising the table entitled ``Alternative Testing Methods for 
Contaminants Listed at 40 CFR 141.25(a)'';
0
d. Revising the table entitled ``Alternative Testing Methods for 
Contaminants Listed at 40 CFR 141.74(a)(1)'';
0
e. Revising the table entitled ``Alternative Testing Methods for 
Disinfectant Residuals Listed at 40 CFR 141.74(a)(2)'';
0
f. Revising the table entitled ``Alternative Testing Methods for 
Contaminants Listed at 40 CFR 141.131(b)(1)'';
0
g. Revising the table entitled ``Alternative Testing Methods for 
Disinfectant Residuals Listed at 40 CFR 141.131(c)(1)'';
0
h. Revising the table entitled ``Alternative Testing Methods for 
Parameters Listed at 40 CFR 141.131(d)'';
0
i. Revising the table entitled ``Alternative Testing Methods for 
Contaminants Listed at 40 CFR 141.402(c)(2)'';

[[Page 5780]]

0
j. Revising the table entitled ``Alternative Testing Methods for 
Contaminants Listed at 40 CFR 141.852(a)(5)'';
0
k. Revising the table entitled ``Alternative Testing Methods for 
Contaminants Listed at 40 CFR 143.4(b)'';
    The revisions and additions read as follows:

Appendix A to Subpart C of Part 141--Alternative Testing Methods 
Approved for Analyses Under the Safe Drinking Water Act

* * * * *

                                                           Alternative Testing Methods for Contaminants Listed at 40 CFR 141.23(k)(1)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                        SM 23rd
           Contaminant                Methodology         EPA method        SM 21st edition     SM 22nd edition     edition,\49\ SM      SM online \3\         ASTM \4\              Other
                                                                                  \1\                \28\          24th edition \66\
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Alkalinity......................  Titrimetric.......  ..................  2320 B............  2320 B............  2320 B............  ..................  D1067-06 B, 11 B,
                                                                                                                                                           16 B.
Antimony........................  Hydride--Atomic     ..................  ..................  ..................  ..................  ..................  D 3697-07, -12, -
                                   Absorption.                                                                                                             17.
                                  Atomic Absorption;  ..................  3113 B............  3113 B............  3113 B............  3113 B-04, B-10...
                                   Furnace.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
Arsenic.........................  Atomic Absorption;  ..................  3113 B............  3113 B............  3113 B............  3113 B-04, B-10...  D 2972-08 C, -15 C
                                   Furnace.
                                  Hydride Atomic      ..................  3114 B............  3114 B............  3114 B............  3114 B-09.........  D 2972-08 B, -15 B
                                   Absorption.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
Barium..........................  Inductively         ..................  3120 B............  3120 B............  3120 B............
                                   Coupled Plasma.
                                  Atomic Absorption;  ..................  3111 D............  3111 D............  3111 D............
                                   Direct.
                                  Atomic Absorption;  ..................  3113 B............  3113 B............  3113 B............  3113 B-04, B-10...
                                   Furnace.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
Beryllium.......................  Inductively         ..................  3120 B............  3120 B............  3120 B............
                                   Coupled Plasma.
                                  Atomic Absorption;  ..................  3113 B............  3113 B............  3113 B............  3113 B-04, B-10...  D 3645-08 B, -15 B
                                   Furnace.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
Cadmium.........................  Atomic Absorption;  ..................  3113 B............  3113 B............  3113 B............  3113 B-04, B-10...
                                   Furnace.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
Calcium.........................  EDTA titrimetric..  ..................  3500-Ca B.........  3500-Ca B.........  3500-Ca B.........  ..................  D 511-09, -14 A...
                                  Atomic Absorption;  ..................  3111 B............  3111 B............  3111 B............  ..................  D 511-09, -14 B...
                                   Direct Aspiration.

[[Page 5781]]

 
                                  Inductively         ..................  3120 B............  3120 B............  3120 B............
                                   Coupled Plasma.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
                                  Ion Chromatography  ..................  ..................  ..................  ..................  ..................  D 6919-09, -17....
Chromium........................  Inductively         ..................  3120 B............  3120 B............  3120 B............
                                   Coupled Plasma.
                                  Atomic Absorption;  ..................  3113 B............  3113 B............  3113 B............  3113 B-04, B-10...
                                   Furnace.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
Copper..........................  Atomic Absorption;  ..................  3113 B............  3113 B............  3113 B............  3113 B-04, B-10...  D 1688-07, -12 C,
                                   Furnace.                                                                                                                17 C.
                                  Atomic Absorption;  ..................  3111 B............  3111 B............  3111 B............  ..................  D 1688-07, -12 A,
                                   Direct Aspiration.                                                                                                      17 A.
                                  Inductively         ..................  3120 B............  3120 B............  3120 B............
                                   Coupled Plasma.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
                                  Colorimetry.......  ..................  ..................  ..................  ..................  ..................  ..................  Hach Method
                                                                                                                                                                               8026,\35\ Hach
                                                                                                                                                                               Method 10272.\36\
Conductivity....................  Conductance.......  ..................  2510 B............  2510 B............  2510 B............  ..................  D 1125-14 A.......
Cyanide.........................  Manual              ..................  4500-CN-C.........  4500-CN-C.........  4500-CN-C.........  4500-CN-C-99......  D 2036-06 A.......
                                   Distillation with
                                   MgCl2 followed
                                   by:.
                                  Spectrophotometric  ..................  4500-CN-G.........  4500-CN-G.........  4500-CN-G.........  ..................  D 2036-06 B.......
                                   , Amenable.
                                  Spectrophotometric  ..................  4500-CN-E.........  4500-CN-E.........  4500-CN-E.........  ..................  D2036-06 A........
                                   Manual.
                                  Selective           ..................  4500-CN-F.........  4500-CN-F.........  4500-CN-F.........
                                   Electrode.
                                  Gas Chromatography/ ..................  ..................  ..................  ..................  ..................  ..................  ME355.01.\7\
                                   Mass Spectrometry
                                   Headspace.
Fluoride........................  Ion Chromatography  ..................  4110 B............  4110 B............  4110 B............  ..................  D 4327-11, -17....
                                  Manual              ..................  4500-F-B, D.......  4500-F-B, D.......  4500-F-B, D.......
                                   Distillation;
                                   Colorimetric
                                   SPADNS.
                                  Manual Electrode..  ..................  4500-F-C..........  4500-F-C..........  4500-F-C..........  ..................  D 1179-04, 10 B,
                                                                                                                                                           16 B.
                                  Automated Alizarin  ..................  4500-F-E..........  4500-F-E..........  4500-F-E..........
                                  Arsenite-Free       ..................  ..................  ..................  ..................  ..................  ..................  Hach SPADNS 2
                                   Colorimetric                                                                                                                                Method 10225,\22\
                                   SPADNS.                                                                                                                                     Hach Method
                                                                                                                                                                               10312.\67\

[[Page 5782]]

 
Lead............................  Atomic Absorption;  ..................  3113 B............  3113 B............  3113 B............  3113 B-04, B-10...  D 3559-08 D, 15 D.
                                   Furnace.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
                                  Differential Pulse  ..................  ..................  ..................  ..................  ..................  ..................  Method 1001, Rev.
                                   Anodic Stripping                                                                                                                            1.1.\57\
                                   Voltametry.
Magnesium.......................  Atomic Absorption.  ..................  3111 B............  3111 B............  3111 B............  ..................  D 511-09, -14 B...
                                  Inductively         ..................  3120 B............  3120 B............  3120 B............
                                   Coupled Plasma.
                                  Complexation        ..................  3500-Mg B.........  3500-Mg B.........  3500-Mg B.........  ..................  D 511-09, -14 A...
                                   Titrimetric
                                   Methods.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
                                  Ion Chromatography  ..................  ..................  ..................  ..................  ..................  D 6919-09, -17....
Mercury.........................  Manual, Cold Vapor  ..................  3112 B............  3112 B............  3112 B............  3112 B-09.........  D 3223-12, -17....
Nickel..........................  Inductively         ..................  3120 B............  3120 B............  3120 B............
                                   Coupled Plasma.
                                  Atomic Absorption;  ..................  3111 B............  3111 B............  3111 B............
                                   Direct.
                                  Atomic Absorption;  ..................  3113 B............  3113 B............  3113 B............  3113 B-04, B-10...
                                   Furnace.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
Nitrate.........................  Ion Chromatography  ..................  4110 B............  4110 B............  4110 B............  ..................  D 4327-11, -17....
                                  Automated Cadmium   ..................  4500-NO3-F........  4500-NO3-F........  4500-NO3-F........
                                   Reduction.
                                  Manual Cadmium      ..................  4500-NO3- E.......  4500-NO3- E.......  4500-NO3- E.......
                                   Reduction.
                                  Ion Selective       ..................  4500-NO3- D.......  4500-NO3- D.......  4500-NO3- D.......
                                   Electrode.
                                  Reduction/          ..................  ..................  ..................  ..................  ..................  ..................  Systea Easy (1-
                                   Colorimetric.                                                                                                                               Reagent),\8\ NECi
                                                                                                                                                                               Nitrate-
                                                                                                                                                                               Reductase.\40\
                                  Colorimetric;       ..................  ..................  ..................  ..................  ..................  ..................  Hach TNTplus\TM\
                                   Direct.                                                                                                                                     835/836 Method
                                                                                                                                                                               10206.\23\
                                  Capillary Ion       ..................  ..................  ..................  ..................  ..................  D 6508-15.........
                                   Electrophoresis.
Nitrite.........................  Ion Chromatography  ..................  4110 B............  4110 B............  4110 B............  ..................  D 4327-11, -17....
                                  Automated Cadmium   ..................  4500-NO3-F........  4500-NO3-F........  4500-NO3-F........
                                   Reduction.
                                  Manual Cadmium      ..................  4500-NO3-E........  4500-NO3-E........  4500-NO3-E........
                                   Reduction.

[[Page 5783]]

 
                                  Spectrophotometric  ..................  4500-NO2-B........  4500-NO2-B........  4500-NO2-B........
                                  Reduction/          ..................  ..................  ..................  ..................  ..................  ..................  Systea Easy (1-
                                   Colorimetric.                                                                                                                               Reagent),\8\ NECi
                                                                                                                                                                               Nitrate-
                                                                                                                                                                               Reductase.\40\
                                  Capillary Ion       ..................  ..................  ..................  ..................  ..................  D 6508-15.........
                                   Electrophoresis.
Ortho-phosphate.................  Ion Chromatography  ..................  4110 B............  4110 B............  4110 B............  ..................  D 4327-11, -17....
                                  Colorimetric,       ..................  4500-P E..........  4500-P E..........  4500-P E..........  4500-P E-99.......
                                   ascorbic acid,
                                   single reagent.
                                  Colorimetric,       ..................  4500-P F..........  4500-P F..........  4500-P F..........  4500-P F-99.......  Thermo Fisher
                                   Automated,                                                                                                              Discrete
                                   Ascorbic Acid.                                                                                                          Analyzer.\41\.
                                  Capillary Ion       ..................  ..................  ..................  ..................  ..................  D 6508-15.........
                                   Electrophoresis.
pH..............................  Electrometric.....  \48\ 150.3........  4500-H\+\ B.......  4500-H\+\ B.......  4500-H\+\ B.......  ..................  D 1293-12, -18....
Selenium........................  Hydride-Atomic      ..................  3114 B............  3114 B............  3114 B............  3114 B-09.........  D 3859-08 A, -15 A
                                   Absorption.
                                  Atomic Absorption;  ..................  3113 B............  3113 B............  3113 B............  3113 B-04, B-10...  D 3859-08 B, -15 B
                                   Furnace.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
Silica..........................  Colorimetric......  ..................  ..................  ..................  ..................  ..................  D859-05, 10, 16...
                                  Molybdosilicate...  ..................  4500-SiO2 C.......  4500-SiO2 C.......  4500-SiO2 C.......
                                  Heteropoly blue...  ..................  4500-SiO2 D.......  4500-SiO2 D.......  4500-SiO2 D.......
                                  Automated for       ..................  4500-SiO2 E.......  4500-SiO2 E.......  4500-SiO2 E.......
                                   Molybdate-
                                   reactive Silica.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
                                  Inductively         ..................  3120 B............  3120 B............  3120 B............
                                   Coupled Plasma.
Sodium..........................  Atomic Absorption;  ..................  3111 B............  3111 B............  3111 B............
                                   Direct Aspiration.
                                  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
                                  Ion Chromatography  ..................  ..................  ..................  ..................  ..................  D 6919-09, -17....
Temperature.....................  Thermometric......  ..................  2550..............  2550..............  2550..............  2550-10...........
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


[[Page 5784]]


                                       Alternative Testing Methods for Contaminants Listed at 40 CFR 141.24(e)(1)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                          SM 22nd
                                                                                      edition,\28\ SM
                                                                    SM 21st edition        23rd
         Contaminant              Methodology       EPA method            \1\         edition,\49\ SM   SM online \3\       ASTM \4\          Other
                                                                                       24th edition
                                                                                           \66\
--------------------------------------------------------------------------------------------------------------------------------------------------------
Benzene......................  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
Carbon tetrachloride.........  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
Chlorobenzene................  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
1,2-Dichlorobenzene..........  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
1,4-Dichlorobenzene..........  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
1,2-Dichloroethane...........  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
cis-Dichloroethylene.........  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
trans-Dichloroethylene.......  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
Dichloromethane..............  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
1,2-Dichloropropane..........  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
Ethylbenzene.................  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
Styrene......................  Purge &Trap/Gas   524.3,\9\ 524.4
                                Chromatography/   \29\.
                                Mass
                                Spectrometry.
Tetrachloroethylene..........  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
1,1,1-Trichloroethane........  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
Trichloroethylene............  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
Toluene......................  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
1,2,4-Trichlorobenzene.......  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
1,1-Dichloroethylene.........  Purge &Trap/Gas   524.3,\9\ 524.4
                                Chromatography/   \29\.
                                Mass
                                Spectrometry.
1,1,2-Trichlorethane.........  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.

[[Page 5785]]

 
Vinyl chloride...............  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
Xylenes (total)..............  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
2,4-D........................  Gas               ................  6640 B..........  6640 B..........  6640 B-01, B-06  D 5317-20......
                                Chromatography/
                                Electron
                                Capture
                                Detection (GC/
                                ECD).
2,4,5-TP (Silvex)............  Gas               ................  6640 B..........  6640 B..........  6640 B-01, B-06  D 5317-20......
                                Chromatography/
                                Electron
                                Capture
                                Detection (GC/
                                ECD).
Alachlor.....................  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Atrazine.....................  Liquid            536.\25\
                                Chromatography
                                Electrospray
                                Ionization
                                Tandem Mass
                                Spectrometry
                                (LC/ESI-MS/MS).
                               Solid Phase       525.3,\24\
                                Extraction/Gas    523.\26\
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Benzo(a)pyrene...............  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Carbofuran...................  High-performance  ................  6610 B..........  6610 B..........  6610 B-04......
                                liquid
                                chromatography
                                (HPLC) with
                                post-column
                                derivatization
                                and
                                fluorescence
                                detection.
                               Liquid            ................  ................  ................  ...............  ...............  ME 531.\58\
                                Chromatography/
                                Mass
                                Spectrometry.
Chlordane....................  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Dalapon......................  Ion               557.\14\
                                Chromatography
                                Electrospray
                                Ionization
                                Tandem Mass
                                Spectrometry
                                (IC-ESI-MS/MS).
                               Gas               ................  6640 B..........  6640 B..........  6640 B-01, B-06
                                Chromatography/
                                Electron
                                Capture
                                Detection (GC/
                                ECD).

[[Page 5786]]

 
Di(2-ethylhexyl)adipate......  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Di(2-ethylhexyl)phthalate....  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Dibromochloropropane (DBCP)..  Purge &Trap/Gas   524.3.\9\
                                Chromatography/
                                Mass
                                Spectrometry.
Dinoseb......................  Gas               ................  6640 B..........  6640 B..........  6640 B-01, B-06
                                Chromatography/
                                Electron
                                Capture
                                Detection (GC/
                                ECD).
Endrin.......................  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Ethyl dibromide (EDB)........  Purge &Trap/Gas   524.3.\9\
                                Chromatography/
                                Mass
                                Spectrometry.
Glyphosate...................  High-Performance  ................  6651 B..........  6651 B..........  6651 B-00, B-05
                                Liquid
                                Chromatography
                                (HPLC) with
                                Post-Column
                                Derivatization
                                and
                                Fluorescence
                                Detection.
Heptachlor...................  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Heptachlor Epoxide...........  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Hexachlorobenzene............  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Hexachlorocyclo-pentadiene...  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Lindane......................  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Methoxychlor.................  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).

[[Page 5787]]

 
Oxamyl.......................  High-performance  ................  6610 B..........  6610 B..........  6610 B-04......
                                liquid
                                chromatography
                                (HPLC) with
                                post-column
                                derivatization
                                and
                                fluorescence
                                detection.
Liquid Chromatography/Mass     ................  ................  ................  ................  ...............  ME 531.\58\....
 Spectrometry.
PCBs (as Aroclors)...........  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Pentachlorophenol............  Gas               ................  6640 B..........  6640 B..........  6640 B-01, B-06  D 5317-20......
                                Chromatography/
                                Electron
                                Capture
                                Detection (GC/
                                ECD).
Solid Phase Extraction/Gas     525.3.\24\
 Chromatography/Mass
 Spectrometry (GC/MS).
Picloram.....................  Gas               ................  6640 B..........  6640 B..........  6640 B-01, B-06  D 5317-20......
                                Chromatography/
                                Electron
                                Capture
                                Detection (GC/
                                ECD).
Simazine.....................  Liquid            536.\25\
                                Chromatography
                                Electrospray
                                Ionization
                                Tandem Mass
                                Spectrometry
                                (LC/ESI-MS/MS).
Solid Phase Extraction/Gas     525.3,\24\
 Chromatography/Mass            523.\26\
 Spectrometry (GC/MS).
Toxaphene....................  Solid Phase       525.3.\24\
                                Extraction/Gas
                                Chromatography/
                                Mass
                                Spectrometry
                                (GC/MS).
Total Trihalomethanes........  Purge &Trap/Gas   524.3,\9\
                                Chromatography/   524.4.\29\
                                Mass
                                Spectrometry.
--------------------------------------------------------------------------------------------------------------------------------------------------------


                                         Alternative Testing Methods for Contaminants Listed at 40 CFR 141.25(a)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                    SM 22nd
                                                                                                edition,\28\ SM
           Contaminant                Methodology         EPA method        SM 21st edition    23rd edition,\49\       ASTM \4\          SM online \3\
                                                                                  \1\           SM 24th edition
                                                                                                     \66\
--------------------------------------------------------------------------------------------------------------------------------------------------------
Naturally Occurring:
    Gross alpha and beta........  Evaporation.......  900.0, Rev. 1.0     7110 B............  7110 B............
                                                       \50\.
                                  Liquid              ..................  ..................  7110 D............  D 7283-17.........  7110 D-17.
                                   Scintillation.
    Gross alpha.................  Coprecipitation...  ..................  7110 C............  7110 C............
    Radium 226..................  Radon emanation...  903.1, Rev. 1.0     7500-Ra C.........  7500-Ra C.........  D 3454-05, -18, D
                                                       \53\.                                                       3454-21.
                                  Radiochemical.....  903.0, Rev. 1.0     7500-Ra B.........  7500-Ra B.........  D 2460-07.........
                                                       \54\.
                                  Gamma Spectrometry  ..................  ..................  7500-Ra E.........  ..................  7500-Ra E-07.
    Radium 228..................  Radiochemical.....  904.0, Rev. 1.0     7500-Ra D.........  7500-Ra D.........
                                                       \62\.
                                  Gamma Spectrometry  ..................  ..................  7500-Ra E.........  ..................  7500-Ra E-07.
    Uranium.....................  Radiochemical.....  ..................  7500-U B..........  7500-U B..........
                                  ICP-MS............  ..................  3125..............  ..................  D 5673-05, 10, 16.

[[Page 5788]]

 
                                  Alpha spectrometry  ..................  7500-U C..........  7500-U C..........  D 3972-09.........
                                  Laser               ..................  ..................  ..................  D 5174-07.........
                                   Phosphorimetry.
                                  Alpha Liquid        ..................  ..................  ..................  D 6239-09.........
                                   Scintillation
                                   Spectrometry.
Man-Made:
    Radioactive Cesium..........  Radiochemical.....  ..................  7500-Cs B.........  7500-Cs B.........
                                  Gamma Ray           ..................  7120..............  7120..............  D 3649-06.........
                                   Spectrometry.
    Radioactive Iodine..........  Radiochemical.....  ..................  7500-I B, 7500-I    7500-I B, 7500-I    D 3649-06.........
                                                                           C, 7500-I D.        C, 7500-I D.
                                  Gamma Ray           ..................  7120..............  7120..............  D 4785-08, -20....
                                   Spectrometry.
    Radioactive Strontium 89, 90  Radiochemical.....  ..................  7500-Sr B.........  7500-Sr B.........
    Tritium.....................  Liquid              ..................  7500-\3\H B.......  7500-\3\H B.......  D 4107-08, -20....
                                   Scintillation.
    Gamma Emitters..............  Gamma Ray           ..................  7120, 7500-Cs B,    7120, 7500-Cs B,    D 3649-06, D 4785-
                                   Spectrometry.                           7500-I B.           7500-I B.           08, -20.
--------------------------------------------------------------------------------------------------------------------------------------------------------


                                       Alternative Testing Methods for Contaminants Listed at 40 CFR 141.74(a)(1)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                  SM 21st edition   SM 22nd edition   SM 23rd edition  SM 24th edition
           Organism               Methodology           \1\              \28\              \49\              \66\        SM online \3\        Other
--------------------------------------------------------------------------------------------------------------------------------------------------------
Total Coliform...............  Total Coliform    9221 A, B, C....  9221 A, B, C....  9221 A, B, C....  9221 A, B, C...  9221 A, B, C-06
                                Fermentation
                                Technique.
                               Total Coliform    9222 A, B, C....  ................  9222 A, B, C....  9222 A, B, C...
                                Membrane Filter
                                Technique.
                               ONPG-MUG Test...  9223............  9223 B..........  9223 B..........  9223 B.........  9223 B-04......
Fecal Coliforms..............  Fecal Coliform    9221 E..........  9221 E..........  9221 E..........  9221 E.........  9221 E-06......
                                Procedure.
                               Fecal Coliform    9222 D..........  9222 D..........  9222 D..........  9222 D.........  9222 D-06......
                                Filter
                                Procedure.
Heterotrophic bacteria.......  Pour Plate        9215 B..........  9215 B..........  9215 B..........  ...............  9215 B-04......
                                Method.
Turbidity....................  Nephelometric     2130 B..........  2130 B..........  2130 B..........  2130 B.........  ...............  Hach Method
                                Method.                                                                                                   8195, Rev.
                                                                                                                                          3.0.\52\
                               Laser             ................  ................  ................  ...............  ...............  Mitchell
                                Nephelometry                                                                                              M5271,\10\
                                (on-line).                                                                                                Mitchell
                                                                                                                                          M5331, Rev.
                                                                                                                                          1.2,\42\
                                                                                                                                          Lovibond PTV
                                                                                                                                          6000.\46\
                               LED Nephelometry  ................  ................  ................  ...............  ...............  Mitchell
                                (on-line).                                                                                                M5331,\11\
                                                                                                                                          Mitchell
                                                                                                                                          M5331, Rev.
                                                                                                                                          1.2,\42\
                                                                                                                                          Lovibond PTV
                                                                                                                                          2000,\45\
                                                                                                                                          Yokogawa
                                                                                                                                          820.\68\
                               LED Nephelometry  ................  ................  ................  ...............  ...............  AMI
                                (on-line).                                                                                                Turbiwell,\15\
                                                                                                                                          Lovibond PTV
                                                                                                                                          1000.\44\
                               LED Nephelometry  ................  ................  ................  ...............  ...............  Orion
                                (portable).                                                                                               AQ4500,\12\
                                                                                                                                          Lovibond TB
                                                                                                                                          3500,\64\
                                                                                                                                          Lovibond TB
                                                                                                                                          5000.\65\
                               Laser             ................  ................  ................  ...............  ...............  Lovibond TB
                                Nephelometry                                                                                              6000.\63\
                                (portable).
                               360[deg]          ................  ................  ................  ...............  ...............  Hach Method
                                Nephelometry.                                                                                             10258, Rev.
                                                                                                                                          1.0,\39\ Hach
                                                                                                                                          Method 10258,
                                                                                                                                          Rev. 2.0.\51\
--------------------------------------------------------------------------------------------------------------------------------------------------------


[[Page 5789]]


                                  Alternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.74(a)(2)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                    SM 22nd
                                                                                                edition,\28\ SM
            Residual                  Methodology         EPA methods       SM 21st edition    23rd edition,\49\       ASTM \4\              Other
                                                                                  \1\           SM 24th edition
                                                                                                     \66\
--------------------------------------------------------------------------------------------------------------------------------------------------------
Free Chlorine...................  Amperometric        ..................  4500-Cl D.........  4500-Cl D.........  D 1253-08, -14....
                                   Titration.
                                  DPD Ferrous         ..................  4500-Cl F.........  4500-Cl F.........
                                   Titrimetric.
                                  DPD Colorimetric..  ..................  4500-Cl G.........  4500-Cl G.........  ..................  Hach Method
                                                                                                                                       10260.\31\
                                  Indophenol          ..................  ..................  ..................  ..................  Hach Method
                                   Colorimetric.                                                                                       10241.\34\
                                  Syringaldazine      ..................  4500-Cl H.........  4500-Cl H.........
                                   (FACTS).
                                  On-line Chlorine    EPA 334.0.\16\
                                   Analyzer.
                                  Amperometric        ..................  ..................  ..................  ..................  ChloroSense,\17\
                                   Sensor.                                                                                             ChloroSense, Rev.
                                                                                                                                       1.1.\59\
Total Chlorine..................  Amperometric        ..................  4500-Cl D.........  4500-Cl D.........  D 1253-08, -14....
                                   Titration.
                                  Amperometric        ..................  4500-Cl E.........  4500-Cl E.........
                                   Titration (Low
                                   level
                                   measurement).
                                  DPD Ferrous         ..................  4500-Cl F.........  4500-Cl F.........
                                   Titrimetric.
                                  DPD Colorimetric..  ..................  4500-Cl G.........  4500-Cl G.........  ..................  Hach Method
                                                                                                                                       10260.\31\
                                  Indophenol          127.\55\
                                   Colorimetric.
                                  Iodometric          ..................  4500-Cl I.........  4500-Cl I.........
                                   Electrode.
                                  On-line Chlorine    EPA 334.0.\16\
                                   Analyzer.
                                  Amperometric        ..................  ..................  ..................  ..................  ChloroSense,\17\
                                   Sensor.                                                                                             ChloroSense, Rev.
                                                                                                                                       1.1.\59\
Chlorine Dioxide................  Amperometric        ..................  4500-ClO2 C.......  4500-ClO2 C.......
                                   Titration.
                                  Amperometric        ..................  4500-ClO2 E.......  4500-ClO2 E.......
                                   Titration.
                                  Amperometric        ..................  ..................  ..................  ..................  ChlordioX
                                   Sensor.                                                                                             Plus,\32\
                                                                                                                                       ChlordioX Plus,
                                                                                                                                       Rev. 1.1.\60\
Ozone...........................  Indigo Method.....  ..................  4500-O3 B.........  4500-O3 B.........
--------------------------------------------------------------------------------------------------------------------------------------------------------


                                       Alternative Testing Methods for Contaminants Listed at 40 CFR 141.131(b)(1)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                            SM 22nd
                                                                                                                        edition,\28\ SM
                                                                                                       SM 21st edition        23rd
         Contaminant              Methodology       EPA method         ASTM \4\        SM online \3\         \1\        edition,\49\ SM       Other
                                                                                                                          24th Edition
                                                                                                                              \66\
--------------------------------------------------------------------------------------------------------------------------------------------------------
TTHM.........................  P&T/GC/MS.......  524.3,\9\
                                                  524.4.\29\
HAA5.........................  LLE               ................  ................  6251 B-07.......  6251 B.........  6251 B.........
                                (diazomethane)/
                                GC/ECD.
                               Ion               557.\14\
                                Chromatography
                                Electrospray
                                Ionization
                                Tandem Mass
                                Spectrometry
                                (IC-ESI-MS/MS).
                               Two-Dimensional   ................  ................  ................  ...............  ...............  Thermo Fisher
                                Ion                                                                                                       557.1.\47\
                                Chromatography
                                (IC) with
                                Suppressed
                                Conductivity
                                Detection.
Bromate......................  Two-Dimensional   302.0\18\
                                Ion
                                Chromatography
                                (IC).
                               Ion               557.\14\
                                Chromatography
                                Electrospray
                                Ionization
                                Tandem Mass
                                Spectrometry
                                (IC-ESI-MS/MS).

[[Page 5790]]

 
                               Chemically        ................  D 6581-08 A.....
                                Suppressed Ion
                                Chromatography.
                               Electrolytically  ................  D 6581-08 B.....
                                Suppressed Ion
                                Chromatography.
Chlorite.....................  Chemically        ................  D 6581-08 A.....
                                Suppressed Ion
                                Chromatography.
                               Electrolytically  ................  D 6581-08 B.....
                                Suppressed Ion
                                Chromatography.
Chlorite--daily monitoring as  Amperometric      ................  ................  ................  4500-ClO2 E....  4500-ClO2 E....
 prescribed in 40 CFR           Titration.
 141.132(b)(2)(i)(A).
                               Amperometric      ................  ................  ................  ...............  ...............  ChlordioX
                                Sensor.                                                                                                   Plus,\32\
                                                                                                                                          ChlordioX
                                                                                                                                          Plus, Rev.
                                                                                                                                          1.1.\60\
--------------------------------------------------------------------------------------------------------------------------------------------------------


                                  Alternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.131(c)(1)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                           SM 22\nd\
                                                                                        edition,\28\ SM
              Residual                     Methodology        SM 21\st\ edition \1\   23\rd\ edition,\49\          ASTM \4\                Other
                                                                                       SM 24\th\ edition
                                                                                              \66\
--------------------------------------------------------------------------------------------------------------------------------------------------------
Free Chlorine......................  Amperometric Titration  4500-Cl D.............  4500-Cl D............  D 1253-08, -14.......
                                     DPD Ferrous             4500-Cl F.............  4500-Cl F............
                                      Titrimetric.
                                     DPD Colorimetric......  4500-Cl G.............  4500-Cl G............  .....................  Hach Method
                                                                                                                                    10260.\31\
                                     Indophenol              ......................  .....................  .....................  Hach Method
                                      Colorimetric.                                                                                 10241.\34\
                                     Syringaldazine (FACTS)  4500-Cl H.............  4500-Cl H............
                                     Amperometric Sensor...  ......................  .....................  .....................  ChloroSense,\17\
                                                                                                                                    ChloroSense, Rev.
                                                                                                                                    1.1.\59\
                                     On-line Chlorine        ......................  .....................  .....................  EPA 334.0.\16\
                                      Analyzer.
Combined Chlorine..................  Amperometric Titration  4500-Cl D.............  4500-Cl D............  D 1253-08, -14.......
                                     DPD Ferrous             4500-Cl F.............  4500-Cl F............
                                      Titrimetric.
                                     DPD Colorimetric......  4500-Cl G.............  4500-Cl G............  .....................  Hach Method
                                                                                                                                    10260.\31\
Total Chlorine.....................  Amperometric Titration  4500-Cl D.............  4500-Cl D............  D 1253-08, -14.......
                                     >Low level              4500-Cl E.............  4500-Cl E............
                                      Amperometric
                                      Titration.
                                     DPD Ferrous             4500-Cl F.............  4500-Cl F............
                                      Titrimetric.
                                     DPD Colorimetric......  4500-Cl G.............  4500-Cl G............  .....................  Hach Method
                                                                                                                                    10260.\31\
                                     Iodometric Electrode..  4500-Cl I.............  4500-Cl I............
                                     Amperometric Sensor...  ......................  .....................  .....................  ChloroSense,\17\
                                                                                                                                    ChloroSense, Rev.
                                                                                                                                    1.1.\59\
                                     On-line Chlorine        ......................  .....................  .....................  EPA 334.0.\16\
                                      Analyzer.
Chlorine Dioxide...................  Amperometric Method II  4500-ClO2 E...........  4500-ClO2 E..........
                                     Amperometric Sensor...  ......................  .....................  .....................  ChlordioX Plus,\32\
                                                                                                                                    ChlordioX Plus, Rev.
                                                                                                                                    1.1.\60\
--------------------------------------------------------------------------------------------------------------------------------------------------------

* * * * *

                                         Alternative Testing Methods for Parameters Listed at 40 CFR 141.131(d)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                         SM 23\rd\
                                                     SM 21\st\         SM 22\nd\     edition \49\, SM
          Parameter               Methodology       edition \1\      edition \28\     24\th\ edition    SM online \3\         EPA             Other
                                                                                           \66\
--------------------------------------------------------------------------------------------------------------------------------------------------------
Total Organic Carbon (TOC)...  High Temperature  5310 B..........  5310 B..........  5310 B..........  ...............  415.3, Rev 1.2
                                Combustion.                                                                              \19\.
                               Persulfate-       5310 C..........  5310 C..........  5310 C..........  ...............  415.3, Rev 1.2   Hach Method
                                Ultraviolet or                                                                           \19\.            10267 \38\.
                                Heated
                                Persulfate
                                Oxidation.
                               Wet Oxidation...  5310 D..........  5310 D..........  ................  ...............  415.3, Rev 1.2
                                                                                                                         \19\.
                               Ozone Oxidation.  ................  ................  ................  ...............  ...............  Hach Method
                                                                                                                                          10261 \37\.
Specific Ultraviolet           Calculation       ................  ................  ................  ...............  415.3, Rev 1.2
 Absorbance (SUVA).             using DOC and                                                                            \19\.
                                UV254 data.
Dissolved Organic Carbon       High Temperature  5310 B..........  5310 B..........  5310 B..........  ...............  415.3, Rev 1.2
 (DOC).                         Combustion.                                                                              \19\.

[[Page 5791]]

 
                               Persulfate-       5310 C..........  5310 C..........  5310 C..........  ...............  415.3, Rev 1.2
                                Ultraviolet or                                                                           \19\.
                                Heated
                                Persulfate
                                Oxidation.
                               Wet Oxidation...  5310 D..........  5310 D..........  ................  ...............  415.3, Rev 1.2
                                                                                                                         \19\.
Ultraviolet absorption at 254  Spectrophotometr  5910 B..........  5910 B..........  5910 B..........  5910 B-11......  415.3, Rev 1.2   ...............
 nm (UV254).                    y.                                                                                       \19\.
--------------------------------------------------------------------------------------------------------------------------------------------------------

* * * * *

                                       Alternative Testing Methods for Contaminants Listed at 40 CFR 141.402(c)(2)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                          SM 23\rd\
                                                     SM 20\th\         SM 21\st\         SM 22\nd\      edition \49\,
           Organism               Methodology       edition \6\       edition \1\      edition \28\       SM 24\th\      SM online \3\        Other
                                                                                                         edition \66\
--------------------------------------------------------------------------------------------------------------------------------------------------------
E. coli......................  Colilert........  ................  9223 B..........  9223 B..........  9223 B.........  9223 B-97, B-04
                               Colisure........  ................  9223 B..........  9223 B..........  9223 B.........  9223 B-97, B-04
                               Colilert-18.....  9223 B..........  9223 B..........  9223 B..........  9223 B.........  9223 B-97, B-04
                               Readycult[supreg  ................  ................  ................  ...............  ...............  Readycult[supre
                                ].                                                                                                        g].\20\
                               Colitag.........  ................  ................  ................  ...............  ...............  Modified
                                                                                                                                          ColitagTM
                                                                                                                                          \13\, Modified
                                                                                                                                          Colitag TM,
                                                                                                                                          Version
                                                                                                                                          2.0.\61\
                               Chromocult[supre  ................  ................  ................  ...............  ...............  Chromocult[supr
                                g].                                                                                                       eg].\21\
                               EC-MUG..........  ................  ................  9221 F..........  9221 F.........  9221 F-06......
                               NA-MUG..........  ................  ................  ................  9222 I.........
                               mColiBlue24 Test  ................  ................  ................  9222 J.........
                               Tecta EC/TC \33\
                                \43\.
                               RAPID'E.coli 2
                                \56\.
Enterococci..................  Multiple-Tube     ................  ................  ................  9230 B.........  9230 B-04......
                                Technique.
                               Membrane Filter   ................  ................  ................  9230 C.........
                                Techniques.
                               Fluorogenic       ................  ................  ................  9230 D.........
                                Substrate
                                Enterococcus
                                Test (using
                                Enterolert).
Coliphage....................  Two-Step          ................  ................  ................  ...............  ...............  Fast Phage.\30\
                                Enrichment
                                Presence-
                                Absence
                                Procedure.
--------------------------------------------------------------------------------------------------------------------------------------------------------

* * * * *

                                       Alternative Testing Methods for Contaminants Listed at 40 CFR 141.852(a)(5)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                   SM 23\rd\ edition
            Organism                  Methodology           Method         SM 20\th\, 21\st\   SM 22\nd\ edition    \49\, SM 24\th\      SM online \3\
                                       category                            editions \1\ \6\          \28\            edition \66\
--------------------------------------------------------------------------------------------------------------------------------------------------------
Total Coliforms.................  Lactose             Standard Total      ..................  9221 B.1, B.2.....  9221 B.1, B.2,      9221 B.1, B.2-06.
                                   Fermentation        Coliform                                                    B.3, B.4.
                                   Methods.            Fermentation
                                                       Technique.
                                                      Presence-Absence    ..................  ..................  9221 D.1, D.2, D.3
                                                       (P-A) Coliform
                                                       Test.
                                  Membrane            Standard Total      ..................  ..................  9222 B, C.........
                                   Filtration          Coliform Membrane
                                   Methods.            Filter Procedure
                                                       using Endo Media.
                                                      Simultaneous        ..................  ..................  9222 J............
                                                       Detection of
                                                       Total Coliforms
                                                       and E. coli by
                                                       Dual Chromogen
                                                       Membrane Filter
                                                       Procedure (using
                                                       mColiBlue24
                                                       medium).
                                                      Simultaneous
                                                       Detection of
                                                       Total Coliform
                                                       Bacteria and
                                                       Escherichia coli
                                                       Using
                                                       RAPID'E.coli
                                                       (REC2) in
                                                       Drinking Water
                                                       \56\.
                                  Enzyme Substrate    Colilert[supreg]..  ..................  9223 B............  9223 B............  9223 B-04.
                                   Methods.
                                                      Colisure[supreg]..  ..................  9223 B............  9223 B............  9223 B-04.
                                                      Colilert-18.......  9223 B............  9223 B............  9223 B............  9223 B-04.
                                                      Tecta EC/TC \33\
                                                       \43\.

[[Page 5792]]

 
                                                      Modified
                                                       ColitagTM,
                                                       Version 2.0 \61\.
Escherichia coli................  Escherichia coli    EC-MUG medium.....  ..................  9221 F.1..........  9221 F.1..........  9221 F.1-06.
                                   Procedure
                                   (following
                                   Lactose
                                   Fermentation
                                   Methods).
                                  Escherichia coli    EC broth with MUG   ..................  ..................  9222 H............
                                   Partitioning        (EC-MUG).
                                   Methods
                                   (following
                                   Membrane
                                   Filtration
                                   Methods).
                                                      NA-MUG medium.....  ..................  ..................  9222 I............
                                  Simultaneous        mColiBlue24 medium  ..................  ..................  9222 J............
                                   Detection of
                                   Total Coliforms
                                   and E. coli by
                                   Dual Chromogen
                                   Membrane Filter
                                   Procedure.
                                  Membrane            Simultaneous
                                   Filtration Method.  Detection of
                                                       Total Coliform
                                                       Bacteria and
                                                       Escherichia coli
                                                       Using
                                                       RAPID'E.coli
                                                       (REC2) in
                                                       Drinking Water
                                                       \56\.
                                  Enzyme Substrate    Colilert[supreg]..  ..................  9223 B............  9223 B............  9223 B-04.
                                   Methods.
                                                      Colisure[supreg]..  ..................  9223 B............  9223 B............  9223 B-04.
                                                      Colilert-18.......  9223 B............  9223 B............  9223 B............  9223 B-04.
                                                      Tecta EC/TC \33\
                                                       \43\.
                                                      Modified
                                                       ColitagTM,
                                                       Version 2.0 \61\.
--------------------------------------------------------------------------------------------------------------------------------------------------------


                                         Alternative Testing Methods for Contaminants Listed at 40 CFR 143.4(b)
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                       SM 22\nd\
                                                                                                                    edition,\28\ SM
                                                                                               SM 21\st\ edition        23\rd\
           Contaminant                Methodology         EPA method           ASTM \4\               \1\           edition,\49\ SM      SM online \3\
                                                                                                                    24\th\ edition
                                                                                                                         \66\
--------------------------------------------------------------------------------------------------------------------------------------------------------
Aluminum........................  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
                                  Atomic Absorption;  ..................  ..................  3111 D............  3111 D............
                                   Direct.
                                  Atomic Absorption;  ..................  ..................  3113 B............  3113 B............  3113 B-04, B-10.
                                   Furnace.
                                  Inductively         ..................  ..................  3120 B............  3120 B............
                                   Coupled Plasma.
Chloride........................  Silver Nitrate      ..................  D 512-04 B, 12 B..  4500-Cl\-\B.......  4500-Cl\-\B.......
                                   Titration.
                                  Ion Chromatography  ..................  D 4327-11, -17....  4110 B............  4110 B............
                                  Potentiometric      ..................  ..................  4500-Cl\-\D.......  4500-Cl\-\D.......
                                   Titration.
Color...........................  Visual Comparison.  ..................  ..................  2120 B............  2120 B............
Foaming Agents..................  Methylene Blue      ..................  ..................  5540 C............  5540 C............
                                   Active Substances
                                   (MBAS).
Iron............................  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
                                  Atomic Absorption;  ..................  ..................  3111 B............  3111 B............
                                   Direct.
                                  Atomic Absorption;  ..................  ..................  3113 B............  3113 B............  3113 B-04, B-10
                                   Furnace.
                                  Inductively         ..................  ..................  3120 B............  3120 B............
                                   Coupled Plasma.
Manganese.......................  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
                                  Atomic Absorption;  ..................  ..................  3111 B............  3111 B............
                                   Direct.
                                  Atomic Absorption;  ..................  ..................  3113 B............  3113 B............  3113 B-04, B-10.
                                   Furnace.
                                  Inductively         ..................  ..................  3120 B............  3120 B............
                                   Coupled Plasma.

[[Page 5793]]

 
Odor............................  Threshold Odor      ..................  ..................  2150 B............  2150 B............
                                   Test.
Silver..........................  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
                                  Atomic Absorption;  ..................  ..................  3111 B............  3111 B............
                                   Direct.
                                  Atomic Absorption;  ..................  ..................  3113 B............  3113 B............  3113 B-04, B-10.
                                   Furnace.
                                  Inductively         ..................  ..................  3120 B............  3120 B............
                                   Coupled Plasma.
Sulfate.........................  Ion Chromatography  ..................  D 4327-11, -17....  4110 B............  4110 B............
                                  Gravimetric with    ..................  ..................  4500-SO4 \2\\-\C..  4500-SO4 \2\\-\C..  4500-SO4 \2\\-\C-
                                   ignition of                                                                                         97.
                                   residue.
                                  Gravimetric with    ..................  ..................  4500-SO4 \2\\-\D..  4500-SO4 \2\\-\D..  4500-SO4 \2\\-\D-
                                   drying of residue.                                                                                  97.
                                  Turbidimetric       ..................  D 516-07, 11, 16..  4500-SO4 \2\\-\E..  4500-SO4 \2\\-\E..  4500-SO4 \2\\-\E-
                                   method.                                                                                             97.
                                  Automated           ..................  ..................  4500-SO4 \2\\-\F..  4500-SO4 \2\\-\F..  4500-SO4 \2\\-\F-
                                   methylthymol blue                                                                                   97.
                                   method.
Total Dissolved Solids..........  Total Dissolved     ..................  ..................  2540 C............  2540 C............
                                   Solids Dried at
                                   180 deg C.
Zinc............................  Axially viewed      200.5, Revision
                                   inductively         4.2 \2\.
                                   coupled plasma-
                                   atomic emission
                                   spectrometry
                                   (AVICP-AES).
                                  Atomic Absorption;  ..................  ..................  3111 B............  3111 B............
                                   Direct Aspiration.
                                  Inductively         ..................  ..................  3120 B............  3120 B............
                                   Coupled Plasma.
--------------------------------------------------------------------------------------------------------------------------------------------------------
 * * * * * * *
\1\ Standard Methods for the Examination of Water and Wastewater, 21st edition (2005). Available from American Public Health Association, 800 I Street
  NW, Washington, DC 20001-3710.
\2\ EPA Method 200.5, Revision 4.2. ``Determination of Trace Elements in Drinking Water by Axially Viewed Inductively Coupled Plasma-Atomic Emission
  Spectrometry.'' 2003. EPA/600/R-06/115. (Available at http://www.epa.gov/water-research/epa-drinking-water-research-methods.)
\3\ Standard Methods Online are available at http://www.standardmethods.org. The year in which each method was approved by the Standard Methods
  Committee is designated by the last two digits in the method number. The methods listed are the only online versions that may be used.
\4\ Available from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 or http://astm.org. The methods listed are the only
  alternative versions that may be used.
 * * * * * * *
\6\ Standard Methods for the Examination of Water and Wastewater, 20th edition (1998). Available from American Public Health Association, 800 I Street
  NW, Washington, DC 20001-3710.
\7\ Method ME355.01, Revision 1.0. ``Determination of Cyanide in Drinking Water by GC/MS Headspace,'' May 26, 2009. Available at https://www.nemi.gov or
  from James Eaton, H & E Testing Laboratory, 221 State Street, Augusta, ME 04333. (207) 287-2727.
\8\ Systea Easy (1-Reagent). ``Systea Easy (1-Reagent) Nitrate Method,'' February 4, 2009. Available at https://www.nemi.gov or from Systea Scientific,
  LLC., 900 Jorie Blvd., Suite 35, Oak Brook, IL 60523.
\9\ EPA Method 524.3, Version 1.0. ``Measurement of Purgeable Organic Compounds in Water by Capillary Column Gas Chromatography/Mass Spectrometry,''
  June 2009. EPA 815-B-09-009. Available at https://www.nemi.gov.
\10\ Mitchell Method M5271, Revision 1.1. ``Determination of Turbidity by Laser Nephelometry,'' March 5, 2009. Available at https://www.nemi.gov or from
  Leck Mitchell, Ph.D., PE, 656 Independence Valley Dr., Grand Junction, CO 81507.
\11\ Mitchell Method M5331, Revision 1.1. ``Determination of Turbidity by LED Nephelometry,'' March 5, 2009. Available at https://www.nemi.gov or from
  Leck Mitchell, Ph.D., PE, 656 Independence Valley Dr., Grand Junction, CO 81507.
\12\ Orion Method AQ4500, Revision 1.0. ``Determination of Turbidity by LED Nephelometry,'' May 8, 2009. Available at https://www.nemi.gov or from
  Thermo Scientific, 166 Cummings Center, Beverly, MA 01915, http://www.thermo.com.
\13\ Modified ColitagTM Method. ``Modified ColitagTM Test Method for the Simultaneous Detection of E. coli and other Total Coliforms in Water (ATP D05-
  0035),'' August 28, 2009. Available at https://www.nemi.gov or from CPI International, 5580 Skylane Boulevard, Santa Rosa, CA 95403.
\14\ EPA Method 557. ``Determination of Haloacetic Acids, Bromate, and Dalapon in Drinking Water by Ion Chromatography Electrospray Ionization Tandem
  Mass Spectrometry (IC-ESI-MS/MS),'' September 2009. EPA 815-B-09-012. Available at https://www.nemi.gov.
\15\ AMI Turbiwell, ``Continuous Measurement of Turbidity Using a SWAN AMI Turbiwell Turbidimeter,'' August 2009. Available at https://www.nemi.gov or
  from Markus Bernasconi, SWAN Analytische Instrumente AG, Studbachstrasse 13, CH-8340 Hinwil, Switzerland.
\16\ EPA Method 334.0. ``Determination of Residual Chlorine in Drinking Water Using an On-line Chlorine Analyzer,'' September 2009. EPA 815-B-09-013.
  Available at https://www.nemi.gov.
\17\ ChloroSense. ``Measurement of Free and Total Chlorine in Drinking Water by Palintest ChloroSense,'' August 2009. Available at https://www.nemi.gov
  or from Palintest Ltd, 1455 Jamike Avenue (Suite 100), Erlanger, KY 41018.
\18\ EPA Method 302.0. ``Determination of Bromate in Drinking Water using Two-Dimensional Ion Chromatography with Suppressed Conductivity Detection,''
  September 2009. EPA 815-B-09-014. Available at https://www.nemi.gov.
\19\ EPA 415.3, Revision 1.2. ``Determination of Total Organic Carbon and Specific UV Absorbance at 254 nm in Source Water and Drinking Water,''
  September 2009. EPA/600/R-09/122. Available at http://www.epa.gov/water-research/epa-drinking-water-research-methods.
\20\ Readycult[supreg] Method, ``Readycult[supreg] Coliforms 100 Presence/Absence Test for Detection and Identification of Coliform Bacteria and
  Escherichia coli in Finished Waters,'' January, 2007. Version 1.1. Available from EMD Millipore (division of Merck KGaA, Darmstadt, Germany), 290
  Concord Road, Billerica, MA 01821.
\21\ Chromocult[supreg] Method, ``Chromocult[supreg] Coliform Agar Presence/Absence Membrane Filter Test Method for Detection and Identification of
  Coliform Bacteria and Escherichia coli in Finished Waters,'' November, 2000. Version 1.0. EMD Millipore (division of Merck KGaA, Darmstadt, Germany),
  290 Concord Road, Billerica, MA 01821.
\22\ Hach Company. ``Hach Company SPADNS 2 (Arsenite-Free) Fluoride Method 10225-Spectrophotometric Measurement of Fluoride in Water and Wastewater,''
  January 2011. 5600 Lindbergh Drive, P.O. Box 389, Loveland, Colorado 80539.
\23\ Hach Company. ``Hach Company TNTplus\TM\ 835/836 Nitrate Method 10206-Spectrophotometric Measurement of Nitrate in Water and Wastewater,'' January
  2011. 5600 Lindbergh Drive, P.O. Box 389, Loveland, Colorado 80539.
\24\ EPA Method 525.3. ``Determination of Semivolatile Organic Chemicals in Drinking Water by Solid Phase Extraction and Capillary Column Gas
  Chromatography/Mass Spectrometry (GC/MS),'' February 2012. EPA/600/R-12/010. Available at http://www.epa.gov/water-research/epa-drinking-water-research-methods.

[[Page 5794]]

 
\25\ EPA Method 536. ``Determination of Triazine Pesticides and their Degradates in Drinking Water by Liquid Chromatography Electrospray Ionization
  Tandem Mass Spectrometry (LC/ESI-MS/MS),'' October 2007. EPA 815-B-07-002. Available at the National Service Center for Environmental Publications at
  https://www.epa.gov/nscep.
\26\ EPA Method 523. ``Determination of Triazine Pesticides and their Degradates in Drinking Water by Gas Chromatography/Mass Spectrometry (GC/MS),''
  February 2011. EPA 815-R-11-002. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep.
 * * * * * * *
\28\ Standard Methods for the Examination of Water and Wastewater, 22nd edition (2012). Available from American Public Health Association, 800 I Street
  NW, Washington, DC 20001-3710.
\29\ EPA Method 524.4, Version 1.0. ``Measurement of Purgeable Organic Compounds in Water by Gas Chromatography/Mass Spectrometry using Nitrogen Purge
  Gas.'' May 2013. EPA 815-R-13-002. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep.
\30\ Charm Sciences Inc. ``Fast Phage Test Procedure. Presence/Absence for Coliphage in Ground Water with Same Day Positive Prediction''. Version 009.
  November 2012. 659 Andover Street, Lawrence, MA 01843. Available at www.charmsciences.com.
\31\ Hach Company. ``Hach Method 10260-Determination of Chlorinated Oxidants (Free and Total) in Water Using Disposable Planar Reagent-filled Cuvettes
  and Mesofluidic Channel Colorimetry,'' April 2013. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539.
\32\ ChlordioX Plus. ``Chlorine Dioxide and Chlorite in Drinking Water by Amperometry using Disposable Sensors,'' November 2013.
Available from Palintest Ltd, 1455 Jamike Avenue (Suite 100), Erlanger, KY 41018.
\33\ Tecta EC/TC. ``TechtaTM EC/TC Medium and TechtaTM Instrument: A Presence/Absence Method for the Simultaneous Detection of Total Coliforms and
  Escherichia coli (E. coli) in Drinking Water,'' version 1.0, May 2014. Available from Pathogen Detection Systems, Inc., 382 King Street East,
  Kingston, Ontario, Canada, K7K 2Y2.
\34\ Hach Company. ``Hach Method 10241-Spectrophotometric Measurement of Free Chlorine (Cl2) in Drinking Water,'' November 2015. Revision 1.2. 5600
  Lindbergh Drive, P.O. Box 389, Loveland, CO 80539.
\35\ Hach Company. ``Hach Method 8026-Spectrophotometric Measurement of Copper in Finished Drinking Water,'' December 2015. Revision 1.2. 5600 Lindbergh
  Drive, P.O. Box 389, Loveland, CO 80539.
\36\ Hach Company. ``Hach Method 10272-Spectrophotometric Measurement of Copper in Finished Drinking Water,'' December 2015. Revision 1.2. 5600
  Lindbergh Drive, P.O. Box 389, Loveland, CO 80539.
\37\ Hach Company. ``Hach Method 10261-Total Organic Carbon in Finished Drinking Water by Catalyzed Ozone Hydroxyl Radical Oxidation Infrared
  Analysis,'' December 2015. Revision 1.2. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539.
\38\ Hach Company. ``Hach Method 10267-Spectrophotometric Measurement of Total Organic Carbon (TOC) in Finished Drinking Water,'' December 2015.
  Revision 1.2. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539.
\39\ Hach Company. ``Hach Method 10258-Determination of Turbidity by 360[deg] Nephelometry,'' January 2016. Revision 1.0. 5600 Lindbergh Drive, P.O. Box
  389, Loveland, CO 80539.
\40\ Nitrate Elimination Company Inc. (NECi). ``Method for Nitrate Reductase Nitrate-Nitrogen Analysis of Drinking Water,'' February 2016. Superior
  Enzymes Inc., 334 Hecla Street, Lake Linden, Michigan 49945.
\41\ Thermo Fisher. ``Thermo Fisher Scientific Drinking Water Orthophosphate Method for Thermo Scientific Gallery Discrete Analyzer,'' February 2016.
  Revision 5. Thermo Fisher Scientific, Ratastie 2, 01620 Vantaa, Finland.
\42\ Mitchell Method M5331, Revision 1.2. ``Determination of Turbidity by LED or Laser Nephelometry,'' February 2016. Available from Leck Mitchell,
  Ph.D., PE, 656 Independence Valley Dr., Grand Junction, CO 81507.
\43\ Tecta EC/TC. ``TectaTM EC/TC Medium and the TectaTM Instrument: A Presence/Absence Method for the Simultaneous Detection of Total Coliforms and
  Escherichia coli (E. coli) in Drinking Water,'' version 2.0, March 2017. Available from Pathogen Detection Systems, Inc., 382 King Street East,
  Kingston, Ontario, Canada, K7K 2Y2.
\44\ Lovibond PTV 1000. ``Continuous Measurement of Drinking Water Turbidity using a Lovibond PTV 1000 White Light LED Turbidimeter,'' December 2016.
  Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243.
\45\ Lovibond PTV 2000. ``Continuous Measurement of Drinking Water Turbidity Using a Lovibond PTV 2000 660-nm LED Turbidimeter,'' December 2016.
  Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243.
\46\ Lovibond PTV 6000. ``Continuous Measurement of Drinking Water Turbidity Using a Lovibond PTV 6000 Laser Turbidimeter,'' December 2016. Revision
  1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243.
\47\ Thermo Fisher. ``Thermo Fisher method 557.1: Determination of Haloacetic Acids in Drinking Water using Two-Dimensional Ion Chromatography with
  Suppressed Conductivity Detection,'' January 2017. Version 1.0. Available from Thermo Fisher Scientific, 490 Lakeside Dr., Sunnyvale, CA 94085
  ([email protected]).
\48\ EPA Method 150.3. ``Determination of pH in Drinking Water,'' February 2017. EPA 815-B-17-001. Available at the National Service Center for
  Environmental Publications at https://www.epa.gov/nscep.
\49\ Standard Methods for the Examination of Water and Wastewater, 23rd edition (2017). Available from American Public Health Association, 800 I Street
  NW, Washington, DC 20001-3710.
\50\ EPA Method 900.0, Rev. 1.0. ``Determination of Gross Alpha and Gross Beta in Drinking Water,'' February 2018. EPA 815-B-18-002. Available at the
  National Service Center for Environmental Publications at https://www.epa.gov/nscep.
\51\ Hach Company. ``Hach Method 10258--Determination of Turbidity by 360[deg] Nephelometry.'' March 2018. Revision 2.0. 5600 Lindbergh Drive, P.O. Box
  389, Loveland, CO 80539.
\52\ Hach Company. ``Hach Method 8195-Determination of Turbidity by Nephelometry.'' March 2018. Revision 3.0. 5600 Lindbergh Drive, P.O. Box 389,
  Loveland, CO 80539.
\53\ EPA Method 903.1, Rev. 1.0. ``Radium-226 in Drinking Water Radon Emanation Technique.'' January 2021. EPA 815-B-21-003. Available at the National
  Service Center for Environmental Publications at https://www.epa.gov/nscep.
\54\ EPA Method 903.0, Rev. 1.0. ``Alpha-Emitting Radium Isotopes in Drinking Water.'' January 2021. EPA 815-B-21-002. Available at the National Service
  Center for Environmental Publications at https://www.epa.gov/nscep.
\55\ EPA Method 127. ``Determination of Monochloramine Concentration in Drinking Water.'' January 2021. EPA 815-B-21-004. Available at the National
  Service Center for Environmental Publications at https://www.epa.gov/nscep.
\56\ Bio-Rad. ``Simultaneous Detection of Total Coliform Bacteria and Escherichia coli using RAPID'E. coli 2 (REC2) in Drinking Water.'' May 2020. Bio-
  Rad Laboratories, 2000 Nobel Drive, Hercules, California 94547.
\57\ Method 1001, Rev. 1.1. ``Lead in Drinking Water by Differential Pulse Anodic Stripping Voltammetry.'' May 2020. Palintest Ltd, 400 Corporate
  Circle, Suite J, Golden, CO 80401.
\58\ ME 531, Version 1.0. ``Measurement of N-Methylcarbamoyloximes and N-Methylcarbamates in Drinking Water by LC-MS/MS. September 2019. Maine Health
  Environmental Testing Laboratory, 221 State Street, Augusta, ME 04330.
\59\ ChloroSense, Rev. 1.1. ``Free and Total Chlorine in Drinking Water by Amperometry using Disposable Sensors.'' February 2020. Palintest Ltd, 400
  Corporate Circle, Suite J, Golden, CO 80401.
\60\ ChlordioX Plus, Rev. 1.1. ``Chlorine Dioxide and Chlorite in Drinking Water by Amperometry using Disposable Sensors.'' February 2020. Palintest
  Ltd, 400 Corporate Circle, Suite J, Golden, CO 80401.
\61\ Modified ColitagTM, Version 2.0. ``Modified ColitagTM Test Method for the Simultaneous Determination of Total Coliforms and E. coli in Water.''
  June 2020. Neogen Corporation, 620 Lesher Place, Lansing, MI 48912.
\62\ EPA Method 904.0, Rev. 1.0. ``Radium-228 in Drinking Water.'' March 2022. EPA 815-B-22-003. Available at the National Service Center for
  Environmental Publications at https://www.epa.gov/nscep.
\63\ Lovibond TB 6000. ``Measurement of Drinking Water Turbidity of a Captured Sample using a Lovibond Portable Laser Turbidimeter.'' May 2021. Revision
  1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243.
\64\ Lovibond TB 3500. ``Measurement of Drinking Water Turbidity of a Captured Sample using a Lovibond White Light LED Portable Turbidimeter.'' May
  2021. Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243.
\65\ Lovibond TB 5000. ``Measurement of Drinking Water Turbidity of a Captured Sample using a Lovibond 660-nm LED Portable Turbidimeter.'' May 2021.
  Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243.
\66\ Standard Methods for the Examination of Water and Wastewater, 24th edition (2023). Available from American Public Health Association, 800 I Street
  NW, Washington, DC 20001-3710.
\67\ Hach Company. ``Hach Method 10312--Spectrophotometric Measurement of Fluoride in Finished Drinking Water Aluminum-Chromeazurol S complex (AL-CAS)
  Using Planar Reagent-filled Cuvettes''. August 2022. Revision 1.0. 5600 Lindbergh Drive, Loveland, Colorado 80539.
\68\ Yokogawa Electric Corporation. ``Yokogawa Method 820--Measurement of Turbidity in Drinking Water by Right Angle Scattered Light Turbidity
  Analyzer''. November 2022. Revision 1.0. 2-9-32 Nakamachi, Musashino-shi, Tokyo, Japan 180-8750.

[FR Doc. 2024-01530 Filed 1-29-24; 8:45 am]
BILLING CODE 6560-50-P