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 Environmental Protection Agency 40 CFR Part 141
[EPA-HQ-OW-2023-0541; FRL-11620-01-OW]
 AGENCY: Environmental Protection Agency (EPA).
 ACTION: Final rule.
 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: 
                        *wells.teresa@epa.gov.*


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: Category
Examples of potentially regulated entities
NAICS 1State, local, & Tribal governments
State, local, and 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
924110Industry
Private operators of community and non-transient non-community water systems required to monitor
221310Municipalities
Municipal operators of community and non-transient non-community water systems required to monitor
9241101
                         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:
                    ( print page 5775) ASTM revised version
Approved method
Contaminant
Regulation citationD 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 citations2120 B
2120 B-01, online version (APHA 2001a)
Color
40 CFR 143.4(b).2130 B
2130 B-01, online version (APHA 2001b)
Turbidity
40 CFR 141.74(a)(1).2150 B
2150 B-97, online version (APHA 1997a)
Odor
40 CFR 143.4(b).2320 B
2320 B-97, online version (APHA 1997b)
Alkalinity
40 CFR 141.23(k)(1).2510 B
2510 B-97, online version (APHA 1997c)
Conductivity
40 CFR 141.23(k)(1).2540 C
2540 C-97, online version (APHA 1997d)
Total Dissolved Solids
40 CFR 143.4(b).2550
2550-00, online version (APHA 2000a)
Temperature
40 CFR 141.23(k)(1).3111 B
3111 B-99, online version (APHA 1999a)
Calcium, copper, magnesium, nickel, sodium, iron, manganese, silver, zinc
40 CFR 141.23(k)(1); 40 CFR 143.4(b).3111 D
3111 D-99, online version (APHA 1999a)
Barium, aluminum
40 CFR 141.23(k)(1); 40 CFR 143.4(b).3112 B
3112 B-99, online version (APHA 1999b)
Mercury
40 CFR 141.23(k)(1).3113 B
3113 B, 19th Edition (APHA 1995)
Antimony, arsenic, barium, beryllium, cadmium, chromium, copper, lead, nickel, selenium, aluminum, iron, manganese, silver
40 CFR 141.23(k)(1); 40 CFR 143.4(b).3114 B
3114 B-97, online version (APHA 1997e)
Arsenic, selenium
40 CFR 141.23(k)(1).3120 B
3120 B-99, online version (APHA 1999c)
Barium, beryllium, calcium, chromium, copper, magnesium, nickel, silica, aluminum, iron, manganese, silver, zinc
40 CFR 141.23(k)(1); 40 CFR 143.4(b).3500-Ca B
3500-Ca B-97, online version (APHA 1997f)
Calcium
40 CFR 141.23(k)(1).3500-Mg B
3500-Mg B-97, online version (APHA 1997g)
Magnesium
40 CFR 141.23(k)(1).4110 B
4110 B-00, online version (APHA 2000b)
Fluoride, nitrate, nitrite, ortho-phosphate, chloride, sulfate
40 CFR 141.23(k)(1); 40 CFR 143.4(b).4500-Cl D,F,G,H
4500-Cl D,F,G,H-00, online versions (APHA 2000c)
Free chlorine
40 CFR 141.74(a)(2); 40 CFR 141.131(c)(1).4500-Cl D,E,F,G,I
4500-Cl D,E,F,G,I-00, online versions (APHA 2000c)
Total chlorine
40 CFR 141.74(a)(2); 40 CFR 141.131(c)(1).4500-Cl D,F,G
4500-Cl D,F,G-00, online versions (APHA 2000c)
Combined chlorine
40 CFR 141.131(c)(1).4500-Cl
                            −
                            B,D
4500-Cl
                            −
                            B,D-97, online versions (APHA 1997h)
Chloride
40 CFR 143.4(b).4500-ClO
                            2
                             C
4500-ClO
                            2
                             C-00, online version (APHA 2000d)
Chlorine dioxide
40 CFR 141.74(a)(2).4500-ClO
                            2
                             E
4500-ClO
                            2
                             E-00, online version (APHA 2000d)
Chlorine dioxide
40 CFR 141.74(a)(2); 40 CFR 141.131(c)(1).4500-ClO
                            2
                             E
4500-ClO
                            2
                             E-00, online version (APHA 2000d)
Chlorite
40 CFR 141.131(b)(1).4500-CN
                            −
                            C,E,F,G
4500-CN
                            −
                            C,E,F,G, 20th Edition (APHA 1998)
Cyanide
40 CFR 141.23(k)(1).4500-F
                            −
                            B,C,D,E
4500-F
                            −
                            B,C,D,E-97, online versions (APHA 1997i)
Fluoride
40 CFR 141.23(k)(1).( print page 5776)4500-H+
                             B
4500-H+
                             B-00, online version (APHA 2000e)
pH
40 CFR 141.23(k)(1).4500-NO
                            3−
                            D
4500-NO
                            3−
                            D-00, online version (APHA 2000f)
Nitrate
40 CFR 141.23(k)(1).4500-NO
                            3−
                            E,F
4500-NO
                            3−
                            E,F-00, online versions (APHA 2000f)
Nitrate, nitrite
40 CFR 141.23(k)(1).4500-NO
                            2−
                            B
4500-NO
                            2−
                            B-00, online version (APHA 2000g)
Nitrite
40 CFR 141.23(k)(1).4500-O
                            3
                             B
4500-O
                            3
                             B-97, online version (APHA 1997j)
Ozone
40 CFR 141.74(a)(2).4500-P E,F
4500-P E,F, 19th Edition, (APHA 1995)
Ortho-phosphate
40 CFR 141.23(k)(1).4500-SiO
                            2
                             C,D,E
4500-SiO
                            2
                             C,D,E-97, online versions (APHA 1997k)
Silica
40 CFR 141.23(k)(1).4500-SO
                            42−
                            C,D,E,F
4500-SO
                            42−
                            C,D,E,F, 19th Edition (APHA 1995)
Sulfate
40 CFR 143.4(b).5310 B,C.
5310 B,C-00, online versions (APHA 2000h)
Dissolved and Total Organic Carbon
40 CFR 141.131(d).5540 C
5540 C-00, online version (APHA 2000i)
Foaming agents
40 CFR 143.4(b).5910 B
5910 B-00, online version (APHA 2000j)
UV Absorption at 254 nm
40 CFR 141.131(d).6251 B
6251 B-94, online version (APHA 1994)
HAA5
40 CFR 141.131(b)(1).6610 B
EPA Method 531.2, Rev. 1.0 (USEPA 2001)
Carbofuran, oxamyl
40 CFR 141.24(e)(1).6640 B
EPA Method 515.4, Rev. 1.0 (USEPA 2000)
2,4-D; 2,4,5-TP; Dalapon; Dinoseb; Pentachlorophenol; Picloram
40 CFR 141.24(e)(1).6651 B
6651 B, 20th Edition, (APHA 1998)
Glyphosate
40 CFR 141.24(e)(1).7110 B
7110 B-00, online version (APHA 2000k)
Gross alpha and gross beta
40 CFR 141.25(a).7110 C
7110 C-00, online version (APHA 2000k)
Gross alpha
40 CFR 141.25(a).7110 D
EPA Method 900.0 (USEPA 1980)
Gross alpha and gross beta
40 CFR 141.25(a).7120
7120-97, online version (APHA 1997l)
Gamma emitters (includes radioactive cesium and iodine)
40 CFR 141.25(a).7500-Cs B
7500-Cs B-00, online version (APHA 2000l)
Radioactive Cesium and Gamma emitters
40 CFR 141.25(a).7500-3
                            H B
7500-3
                            H B-00, online version (APHA 2000m)
Tritium
40 CFR 141.25(a).7500-I B
7500-I B-00, online version (APHA 2000n)
Radioactive Iodine and Gamma emitters
40 CFR 141.25(a).7500-I C,D
7500-I C,D-00, online versions (APHA 2000n)
Radioactive Iodine
40 CFR 141.25(a).7500-Ra B,C
7500-Ra B,C-01, online versions (APHA 2001c)
Radium-226
40 CFR 141.25(a).7500-Ra D
7500-Ra D-01, online version (APHA 2001c)
Radium-228
40 CFR 141.25(a).7500-Ra E
GA Method (2004)
Radium-226 and Radium-228
40 CFR 141.25(a).7500-Sr B
7500-Sr B-01, online version (APHA 2001d)
Strontium-89 and Strontium-90
40 CFR 141.25(a).7500-U B,C
7500-U B,C-00, online versions (APHA 2000o)
Uranium
40 CFR 141.25(a).9221 A,C
9221 A,C, 20th Edition, (APHA 1998)
Total coliforms
40 CFR 141.74(a)(1).9221 B
9221 B, 20th Edition, (APHA 1998)
Total coliforms
40 CFR 141.74(a)(1) 40 CFR 141.852(a)(5) [B.1, B.2, B.3, B.4].9221 D
9221 D, 20th Edition, (APHA 1998)
Total coliforms
40 CFR 141.852(a)(5) [D.1, D.2, D.3].9221 E
9221 E, 20th Edition, (APHA 1998)
Fecal coliforms
40 CFR 141.74(a)(1).9221 F
9221 F, 20th Edition, (APHA 1998)
*E. coli*
40 CFR 141.402(c)(2) 40 CFR 141.852(a)(5) [F.1].9222 A
9222 A 20th Edition, (APHA 1998)
Total coliforms
40 CFR 141.74(a)(1).9222 B,C
9222 B,C, 20th Edition, (APHA 1998)
Total coliforms
40 CFR 141.74(a)(1) 40 CFR 141.852(a)(5).9222 D
9222 D, 20th Edition, (APHA 1998)
Fecal coliforms
40 CFR 141.74(a)(1).9222 H
9222 G, 20th Edition, (APHA 1998)
*E. coli*
40 CFR 141.852(a)(5).9222 I
9222 G, 20th Edition, (APHA 1998)
*E. coli*
40 CFR 141.402(c)(2) 40 CFR 141.852(a)(5).9222 J
m-ColiBlue24 Test (Hach Company 1999)
Total coliforms
40 CFR 141.852(a)(5).9222 J
m-ColiBlue24 Test (Hach Company 1999)
*E. coli*
40 CFR 141.402(c)(2) 40 CFR 141.852(a)(5).9223 B
9223 B, 20th Edition (APHA 1998)
Total coliforms
40 CFR 141.74(a)(1); 40 CFR 141.852(a)(5).( print page 5777)9223 B
9223 B, 20th Edition (APHA 1998)
*E. coli*
40 CFR 141.402(c)(2); 40 CFR 141.852(a)(5).9230 B
9230 C, 20th Edition (APHA 1998)
Enterococci
40 CFR 141.402(c)(2).9230 C
9230 C, 20th Edition (APHA 1998)
Enterococci
40 CFR 141.402(c)(2).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 °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 
                        ( print 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. 
                        ( print 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® 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
 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. 2.Amend Appendix A to subpart C of part 141 by: a.Revising the table entitled “Alternative Testing Methods for Contaminants Listed at 40 CFR 141.23(k)(1)”; b.Revising the table entitled “Alternative Testing Methods for Contaminants Listed at 40 CFR 141.24(e)(1)”; c.Revising the table entitled “Alternative Testing Methods for Contaminants Listed at 40 CFR 141.25(a)”; d.Revising the table entitled “Alternative Testing Methods for Contaminants Listed at 40 CFR 141.74(a)(1)”; e.Revising the table entitled “Alternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.74(a)(2)”; f.Revising the table entitled “Alternative Testing Methods for Contaminants Listed at 40 CFR 141.131(b)(1)”; g.Revising the table entitled “Alternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.131(c)(1)”; h.Revising the table entitled “Alternative Testing Methods for Parameters Listed at 40 CFR 141.131(d)”; i.Revising the table entitled “Alternative Testing Methods for Contaminants Listed at 40 CFR 141.402(c)(2)”;  
                        ( print page 5780) j.Revising the table entitled “Alternative Testing Methods for Contaminants Listed at 40 CFR 141.852(a)(5)”; 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)
Contaminant
Methodology
EPA method
SM 21st
                                     
                                        edition 1
SM 22nd
                                     
                                        edition 28
SM 23rd
                                     
                                        edition,49
                                         SM
                                     
                                     
                                        24th edition 66
SM online 3
ASTM 4
OtherAlkalinity
Titrimetric

2320 B
2320 B
2320 B

D1067-06 B, 11 B, 16 BAntimony
Hydride—Atomic Absorption





D 3697-07, -12, -17Atomic Absorption; Furnace

3113 B
3113 B
3113 B
3113 B-04, B-10Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Arsenic
Atomic Absorption; Furnace

3113 B
3113 B
3113 B
3113 B-04, B-10
D 2972-08 C, -15 CHydride Atomic Absorption

3114 B
3114 B
3114 B
3114 B-09
D 2972-08 B, -15 BAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Barium
Inductively Coupled Plasma

3120 B
3120 B
3120 BAtomic Absorption; Direct

3111 D
3111 D
3111 DAtomic Absorption; Furnace

3113 B
3113 B
3113 B
3113 B-04, B-10Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Beryllium
Inductively Coupled Plasma

3120 B
3120 B
3120 BAtomic Absorption; Furnace

3113 B
3113 B
3113 B
3113 B-04, B-10
D 3645-08 B, -15 BAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Cadmium
Atomic Absorption; Furnace

3113 B
3113 B
3113 B
3113 B-04, B-10Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Calcium
EDTA titrimetric

3500-Ca B
3500-Ca B
3500-Ca B

D 511-09, -14 AAtomic Absorption; Direct Aspiration

3111 B
3111 B
3111 B

D 511-09, -14 B( print page 5781)Inductively Coupled Plasma

3120 B
3120 B
3120 BAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Ion Chromatography





D 6919-09, -17Chromium
Inductively Coupled Plasma

3120 B
3120 B
3120 BAtomic Absorption; Furnace

3113 B
3113 B
3113 B
3113 B-04, B-10Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Copper
Atomic Absorption; Furnace

3113 B
3113 B
3113 B
3113 B-04, B-10
D 1688-07, -12 C, 17 CAtomic Absorption; Direct Aspiration

3111 B
3111 B
3111 B

D 1688-07, -12 A, 17 AInductively Coupled Plasma

3120 B
3120 B
3120 BAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Colorimetry






Hach Method 8026,35
                                     Hach Method 10272.36Conductivity
Conductance

2510 B
2510 B
2510 B

D 1125-14 ACyanide
Manual Distillation with MgCl
                                    2
                                     followed by:

4500-CN
                                    −
                                    C
4500-CN
                                    −
                                    C
4500-CN
                                    −
                                    C
4500-CN
                                    −
                                    C-99
D 2036-06 ASpectrophotometric, Amenable

4500-CN
                                    −
                                    G
4500-CN
                                    −
                                    G
4500-CN
                                    −
                                    G

D 2036-06 BSpectrophotometric Manual

4500-CN
                                    −
                                    E
4500-CN
                                    −
                                    E
4500-CN
                                    −
                                    E

D2036-06 ASelective Electrode

4500-CN
                                    −
                                    F
4500-CN
                                    −
                                    F
4500-CN
                                    −
                                    FGas Chromatography/Mass Spectrometry Headspace






ME355.01.7Fluoride
Ion Chromatography

4110 B
4110 B
4110 B

D 4327-11, -17Manual Distillation; Colorimetric SPADNS

4500-F
                                    −
                                    B, D
4500-F
                                    −
                                    B, D
4500-F
                                    −
                                    B, DManual Electrode

4500-F
                                    −
                                    C
4500-F
                                    −
                                    C
4500-F
                                    −
                                    C

D 1179-04, 10 B, 16 BAutomated Alizarin

4500-F
                                    −
                                    E
4500-F
                                    −
                                    E
4500-F
                                    −
                                    EArsenite-Free Colorimetric SPADNS






Hach SPADNS 2 Method 10225,22
                                     Hach Method 10312.67( print page 5782)Lead
Atomic Absorption; Furnace

3113 B
3113 B
3113 B
3113 B-04, B-10
D 3559-08 D, 15 DAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Differential Pulse Anodic Stripping Voltametry






Method 1001, Rev. 1.1.57Magnesium
Atomic Absorption

3111 B
3111 B
3111 B

D 511-09, -14 BInductively Coupled Plasma

3120 B
3120 B
3120 BComplexation Titrimetric Methods

3500-Mg B
3500-Mg B
3500-Mg B

D 511-09, -14 AAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Ion Chromatography





D 6919-09, -17Mercury
Manual, Cold Vapor

3112 B
3112 B
3112 B
3112 B-09
D 3223-12, -17Nickel
Inductively Coupled Plasma

3120 B
3120 B
3120 BAtomic Absorption; Direct

3111 B
3111 B
3111 BAtomic Absorption; Furnace

3113 B
3113 B
3113 B
3113 B-04, B-10Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Nitrate
Ion Chromatography

4110 B
4110 B
4110 B

D 4327-11, -17Automated Cadmium Reduction

4500-NO
                                    3−
                                    F
4500-NO
                                    3−
                                    F
4500-NO
                                    3−
                                    FManual Cadmium Reduction

4500-NO
                                    3−
                                     E
4500-NO
                                    3−
                                     E
4500-NO
                                    3−
                                     EIon Selective Electrode

4500-NO
                                    3−
                                     D
4500-NO
                                    3−
                                     D
4500-NO
                                    3−
                                     DReduction/Colorimetric






Systea Easy (1-Reagent),8
                                     NECi Nitrate-Reductase.40Colorimetric; Direct






Hach TNTplusTM
                                     835/836 Method 10206.23Capillary Ion Electrophoresis





D 6508-15Nitrite
Ion Chromatography

4110 B
4110 B
4110 B

D 4327-11, -17Automated Cadmium Reduction

4500-NO
                                    3−
                                    F
4500-NO
                                    3−
                                    F
4500-NO
                                    3−
                                    FManual Cadmium Reduction

4500-NO
                                    3−
                                    E
4500-NO
                                    3−
                                    E
4500-NO
                                    3−
                                    E( print page 5783)Spectrophotometric

4500-NO
                                    2−
                                    B
4500-NO
                                    2−
                                    B
4500-NO
                                    2−
                                    BReduction/Colorimetric






Systea Easy (1-Reagent),8
                                     NECi Nitrate-Reductase.40Capillary Ion Electrophoresis





D 6508-15Ortho-phosphate
Ion Chromatography

4110 B
4110 B
4110 B

D 4327-11, -17Colorimetric, ascorbic acid, single reagent

4500-P E
4500-P E
4500-P E
4500-P E-99Colorimetric, Automated, Ascorbic Acid

4500-P F
4500-P F
4500-P F
4500-P F-99
Thermo Fisher Discrete Analyzer.41Capillary Ion Electrophoresis





D 6508-15pH
Electrometric
48
                                     150.3
4500-H+
                                     B
4500-H+
                                     B
4500-H+
                                     B

D 1293-12, -18Selenium
Hydride-Atomic Absorption

3114 B
3114 B
3114 B
3114 B-09
D 3859-08 A, -15 AAtomic Absorption; Furnace

3113 B
3113 B
3113 B
3113 B-04, B-10
D 3859-08 B, -15 BAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Silica
Colorimetric





D859-05, 10, 16Molybdosilicate

4500-SiO
                                    2
                                     C
4500-SiO
                                    2
                                     C
4500-SiO
                                    2
                                     CHeteropoly blue

4500-SiO
                                    2
                                     D
4500-SiO
                                    2
                                     D
4500-SiO
                                    2
                                     DAutomated for Molybdate-reactive Silica

4500-SiO
                                    2
                                     E
4500-SiO
                                    2
                                     E
4500-SiO
                                    2
                                     EAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Inductively Coupled Plasma

3120 B
3120 B
3120 BSodium
Atomic Absorption; Direct Aspiration

3111 B
3111 B
3111 BAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Ion Chromatography





D 6919-09, -17Temperature
Thermometric

2550
2550
2550
2550-10
 
 
 Alternative Testing Methods for Contaminants Listed at 40 CFR 141.24(
                                e
                                )(1)
Contaminant
Methodology
EPA method
SM 21st edition 1
SM 22nd
                                     
                                        edition,28
                                         SM
                                     
                                     
                                        23rd edition,49
                                         SM
                                     
                                     
                                        24th edition 66
SM online 3
ASTM 4
OtherBenzene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29Carbon tetrachloride
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29Chlorobenzene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.291,2-Dichlorobenzene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.291,4-Dichlorobenzene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.291,2-Dichloroethane
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29cis-Dichloroethylene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29trans-Dichloroethylene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29Dichloromethane
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.291,2-Dichloropropane
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29Ethylbenzene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29Styrene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4 29Tetrachloroethylene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.291,1,1-Trichloroethane
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29Trichloroethylene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29Toluene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.291,2,4-Trichlorobenzene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.291,1-Dichloroethylene
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4 291,1,2-Trichlorethane
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29( print page 5785)Vinyl chloride
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29Xylenes (total)
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.292,4-D
Gas Chromatography/Electron Capture Detection (GC/ECD)

6640 B
6640 B
6640 B-01, B-06
D 5317-202,4,5-TP (Silvex)
Gas Chromatography/Electron Capture Detection (GC/ECD)

6640 B
6640 B
6640 B-01, B-06
D 5317-20Alachlor
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Atrazine
Liquid Chromatography Electrospray Ionization Tandem Mass Spectrometry (LC/ESI-MS/MS)
536.25Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3,24
                                     523.26Benzo(a)pyrene
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Carbofuran
High-performance liquid chromatography (HPLC) with post-column derivatization and fluorescence detection

6610 B
6610 B
6610 B-04Liquid Chromatography/Mass Spectrometry





ME 531.58Chlordane
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Dalapon
Ion Chromatography Electrospray Ionization Tandem Mass Spectrometry (IC-ESI-MS/MS)
557.14Gas Chromatography/Electron Capture Detection (GC/ECD)

6640 B
6640 B
6640 B-01, B-06( print page 5786)Di(2-ethylhexyl)adipate
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Di(2-ethylhexyl)phthalate
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Dibromochloropropane (DBCP)
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3.9Dinoseb
Gas Chromatography/Electron Capture Detection (GC/ECD)

6640 B
6640 B
6640 B-01, B-06Endrin
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Ethyl dibromide (EDB)
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3.9Glyphosate
High-Performance Liquid Chromatography (HPLC) with Post-Column Derivatization and Fluorescence Detection

6651 B
6651 B
6651 B-00, B-05Heptachlor
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Heptachlor Epoxide
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Hexachlorobenzene
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Hexachlorocyclo-pentadiene
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Lindane
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Methoxychlor
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24( print page 5787)Oxamyl
High-performance liquid chromatography (HPLC) with post-column derivatization and fluorescence detection

6610 B
6610 B
6610 B-04Liquid Chromatography/Mass Spectrometry





ME 531.58PCBs (as Aroclors)
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Pentachlorophenol
Gas Chromatography/Electron Capture Detection (GC/ECD)

6640 B
6640 B
6640 B-01, B-06
D 5317-20Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Picloram
Gas Chromatography/Electron Capture Detection (GC/ECD)

6640 B
6640 B
6640 B-01, B-06
D 5317-20Simazine
Liquid Chromatography Electrospray Ionization Tandem Mass Spectrometry (LC/ESI-MS/MS)
536.25Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3,24
                                     523.26Toxaphene
Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS)
525.3.24Total Trihalomethanes
Purge &Trap/Gas Chromatography/Mass Spectrometry
524.3,9
                                     524.4.29
 Alternative Testing Methods for Contaminants Listed at 40 CFR 141.25(
                                a
                                )
Contaminant
Methodology
EPA method
SM 21st edition 1
SM 22nd edition,28
                                     SM 23rd edition,49
                                     SM 24th edition 66
ASTM 4
SM online 3Naturally Occurring:Gross alpha and beta
Evaporation
900.0, Rev. 1.0 50
7110 B
7110 BLiquid Scintillation


7110 D
D 7283-17
7110 D-17.Gross alpha
Coprecipitation

7110 C
7110 CRadium 226
Radon emanation
903.1, Rev. 1.0 53
7500-Ra C
7500-Ra C
D 3454-05, -18, D 3454-21Radiochemical
903.0, Rev. 1.0 54
7500-Ra B
7500-Ra B
D 2460-07Gamma Spectrometry


7500-Ra E

7500-Ra E-07.Radium 228
Radiochemical
904.0, Rev. 1.0 62
7500-Ra D
7500-Ra DGamma Spectrometry


7500-Ra E

7500-Ra E-07.Uranium
Radiochemical

7500-U B
7500-U BICP-MS

3125

D 5673-05, 10, 16( print page 5788)Alpha spectrometry

7500-U C
7500-U C
D 3972-09Laser Phosphorimetry



D 5174-07Alpha Liquid Scintillation Spectrometry



D 6239-09Man-Made:Radioactive Cesium
Radiochemical

7500-Cs B
7500-Cs BGamma Ray Spectrometry

7120
7120
D 3649-06Radioactive Iodine
Radiochemical

7500-I B, 7500-I C, 7500-I D
7500-I B, 7500-I C, 7500-I D
D 3649-06Gamma Ray Spectrometry

7120
7120
D 4785-08, -20Radioactive Strontium 89, 90
Radiochemical

7500-Sr B
7500-Sr BTritium
Liquid Scintillation

7500-3
                                    H B
7500-3
                                    H B
D 4107-08, -20Gamma Emitters
Gamma Ray Spectrometry

7120, 7500-Cs B, 7500-I B
7120, 7500-Cs B, 7500-I B
D 3649-06, D 4785-08, -20
 Alternative Testing Methods for Contaminants Listed at 40 CFR 141.74(
                                a
                                )(1)
Organism
Methodology
SM 21st edition 1
SM 22nd
                                     
                                        edition 28
SM 23rd edition 49
SM 24th edition 66
SM online 3
OtherTotal Coliform
Total Coliform Fermentation Technique
9221 A, B, C
9221 A, B, C
9221 A, B, C
9221 A, B, C
9221 A, B, C-06Total Coliform Membrane Filter Technique
9222 A, B, C

9222 A, B, C
9222 A, B, CONPG-MUG Test
9223
9223 B
9223 B
9223 B
9223 B-04Fecal Coliforms
Fecal Coliform Procedure
9221 E
9221 E
9221 E
9221 E
9221 E-06Fecal Coliform Filter Procedure
9222 D
9222 D
9222 D
9222 D
9222 D-06Heterotrophic bacteria
Pour Plate Method
9215 B
9215 B
9215 B

9215 B-04Turbidity
Nephelometric Method
2130 B
2130 B
2130 B
2130 B

Hach Method 8195, Rev. 3.0.52Laser Nephelometry (on-line)





Mitchell M5271,10
                                     Mitchell M5331, Rev. 1.2,42
                                     Lovibond PTV 6000.46LED Nephelometry (on-line)





Mitchell M5331,11
                                     Mitchell M5331, Rev. 1.2,42
                                     Lovibond PTV 2000,45
                                     Yokogawa 820.68LED Nephelometry (on-line)





AMI Turbiwell,15
                                     Lovibond PTV 1000.44LED Nephelometry (portable)





Orion AQ4500,12
                                     Lovibond TB 3500,64
                                     Lovibond TB 5000.65Laser Nephelometry (portable)





Lovibond TB 6000.63360° Nephelometry





Hach Method 10258, Rev. 1.0,39
                                     Hach Method 10258, Rev. 2.0.51
 
 
 Alternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.74(
                                a
                                )(2)
Residual
Methodology
EPA methods
SM 21st edition 1
SM 22nd edition,28
                                     SM 23rd edition,49
                                     SM 24th edition 66
ASTM 4
OtherFree Chlorine
Amperometric Titration

4500-Cl D
4500-Cl D
D 1253-08, -14DPD Ferrous Titrimetric

4500-Cl F
4500-Cl FDPD Colorimetric

4500-Cl G
4500-Cl G

Hach Method 10260.31Indophenol Colorimetric




Hach Method 10241.34Syringaldazine (FACTS)

4500-Cl H
4500-Cl HOn-line Chlorine Analyzer
EPA 334.0.16Amperometric Sensor




ChloroSense,17
                                     ChloroSense, Rev. 1.1.59Total Chlorine
Amperometric Titration

4500-Cl D
4500-Cl D
D 1253-08, -14Amperometric Titration (Low level measurement)

4500-Cl E
4500-Cl EDPD Ferrous Titrimetric

4500-Cl F
4500-Cl FDPD Colorimetric

4500-Cl G
4500-Cl G

Hach Method 10260.31Indophenol Colorimetric
127.55Iodometric Electrode

4500-Cl I
4500-Cl IOn-line Chlorine Analyzer
EPA 334.0.16Amperometric Sensor




ChloroSense,17
                                     ChloroSense, Rev. 1.1.59Chlorine Dioxide
Amperometric Titration

4500-ClO
                                    2
                                     C
4500-ClO
                                    2
                                     CAmperometric Titration

4500-ClO
                                    2
                                     E
4500-ClO
                                    2
                                     EAmperometric Sensor




ChlordioX Plus,32
                                     ChlordioX Plus, Rev. 1.1.60Ozone
Indigo Method

4500-O
                                    3
                                     B
4500-O
                                    3
                                     B
 Alternative Testing Methods for Contaminants Listed at 40 CFR 141.131(
                                b
                                )(1)
Contaminant
Methodology
EPA method
ASTM 4
SM online 3
SM 21st edition 1
SM 22nd
                                     
                                        edition,28
                                         SM
                                     
                                     
                                        23rd edition,49
                                     
                                     SM 24th 
                                     
                                        Edition 66
OtherTTHM
P&T/GC/MS
524.3,9
                                     524.4.29HAA5
LLE (diazomethane)/GC/ECD


6251 B-07
6251 B
6251 BIon Chromatography Electrospray Ionization Tandem Mass Spectrometry (IC-ESI-MS/MS)
557.14Two-Dimensional Ion Chromatography (IC) with Suppressed Conductivity Detection





Thermo Fisher 557.1.47Bromate
Two-Dimensional Ion Chromatography (IC)
302.018Ion Chromatography Electrospray Ionization Tandem Mass Spectrometry (IC-ESI-MS/MS)
557.14( print page 5790)Chemically Suppressed Ion Chromatography

D 6581-08 AElectrolytically Suppressed Ion Chromatography

D 6581-08 BChlorite
Chemically Suppressed Ion Chromatography

D 6581-08 AElectrolytically Suppressed Ion Chromatography

D 6581-08 BChlorite—daily monitoring as prescribed in 40 CFR 141.132(b)(2)(i)(A)
Amperometric Titration



4500-ClO
                                    2
                                     E
4500-ClO
                                    2
                                     EAmperometric Sensor





ChlordioX Plus,32
                                     ChlordioX Plus, Rev. 1.1.60
 Alternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.131(
                                c
                                )(1)
Residual
Methodology
SM 21st
                                     edition 1
SM 22nd
                                     edition,28
                                     SM 23rd
                                     edition,49
                                     SM 24th
                                     edition 66
ASTM 4
OtherFree Chlorine
Amperometric Titration
4500-Cl D
4500-Cl D
D 1253-08, -14DPD Ferrous Titrimetric
4500-Cl F
4500-Cl FDPD Colorimetric
4500-Cl G
4500-Cl G

Hach Method 10260.31Indophenol Colorimetric



Hach Method 10241.34Syringaldazine (FACTS)
4500-Cl H
4500-Cl HAmperometric Sensor



ChloroSense,17
                                     ChloroSense, Rev. 1.1.59On-line Chlorine Analyzer



EPA 334.0.16Combined Chlorine
Amperometric Titration
4500-Cl D
4500-Cl D
D 1253-08, -14.DPD Ferrous Titrimetric
4500-Cl F
4500-Cl FDPD Colorimetric
4500-Cl G
4500-Cl G

Hach Method 10260.31Total Chlorine
Amperometric Titration
4500-Cl D
4500-Cl D
D 1253-08, -14>Low level Amperometric Titration
4500-Cl E
4500-Cl EDPD Ferrous Titrimetric
4500-Cl F
4500-Cl FDPD Colorimetric
4500-Cl G
4500-Cl G

Hach Method 10260.31Iodometric Electrode
4500-Cl I
4500-Cl IAmperometric Sensor



ChloroSense,17
                                     ChloroSense, Rev. 1.1.59On-line Chlorine Analyzer



EPA 334.0.16Chlorine Dioxide
Amperometric Method II
4500-ClO
                                    2
                                     E
4500-ClO
                                    2
                                     EAmperometric Sensor



ChlordioX Plus,32
                                     ChlordioX Plus, Rev. 1.1.60
 
 Alternative Testing Methods for Parameters Listed at 40 CFR 141.131(
                                d
                                )
Parameter
Methodology
SM 21st
                                     edition 1
SM 22nd
                                     edition 28
SM 23rd
                                     edition 49
                                    , SM 24th
                                     edition 66
SM online 3
EPA
OtherTotal Organic Carbon (TOC)
High Temperature Combustion
5310 B
5310 B
5310 B

415.3, Rev 1.2 19Persulfate-Ultraviolet or Heated Persulfate Oxidation
5310 C
5310 C
5310 C

415.3, Rev 1.2 19
Hach Method 10267 38
                                    .Wet Oxidation
5310 D
5310 D


415.3, Rev 1.2 19Ozone Oxidation





Hach Method 10261 37
                                    .Specific Ultraviolet Absorbance (SUVA)
Calculation using DOC and UV
                                    254
                                     data




415.3, Rev 1.2 19Dissolved Organic Carbon (DOC)
High Temperature Combustion
5310 B
5310 B
5310 B

415.3, Rev 1.2 19( print page 5791)Persulfate-Ultraviolet or Heated Persulfate Oxidation
5310 C
5310 C
5310 C

415.3, Rev 1.2 19Wet Oxidation
5310 D
5310 D


415.3, Rev 1.2 19Ultraviolet absorption at 254 nm (UV
                                    254
                                    )
Spectrophotometry
5910 B
5910 B
5910 B
5910 B-11
415.3, Rev 1.2 19
 
 Alternative Testing Methods for Contaminants Listed at 40 CFR 141.402(
                                c
                                )(2)
Organism
Methodology
SM 20th
                                     edition 6
SM 21st
                                     edition 1
SM 22nd
                                     edition 28
SM 23rd
                                     edition 49
                                    , SM 24th
                                     edition 66
SM online 3
Other*E. coli*
Colilert

9223 B
9223 B
9223 B
9223 B-97, B-04Colisure

9223 B
9223 B
9223 B
9223 B-97, B-04Colilert-18
9223 B
9223 B
9223 B
9223 B
9223 B-97, B-04Readycult®





Readycult®.20Colitag





Modified Colitag
                                    TM
                                     13
                                    , Modified Colitag 
                                    TM
                                    , Version 2.0.61Chromocult®





Chromocult®.21EC-MUG


9221 F
9221 F
9221 F-06NA-MUG



9222 ImColiBlue24 Test



9222 JTecta EC/TC 33
                                     43RAPID'E.coli 2 56Enterococci
Multiple-Tube Technique



9230 B
9230 B-04Membrane Filter Techniques



9230 CFluorogenic Substrate Enterococcus Test (using Enterolert)



9230 DColiphage
Two-Step Enrichment Presence-Absence Procedure





Fast Phage.30
 
 Alternative Testing Methods for Contaminants Listed at 40 CFR 141.852(
                                a
                                )(5)
Organism
Methodology category
Method
SM 20th
                                    , 21st
                                     editions 1
                                     6
SM 22nd
                                     edition 28
SM 23rd
                                     edition 49
                                    , SM 24th
                                     edition 66
SM online 3Total Coliforms
Lactose Fermentation Methods
Standard Total Coliform Fermentation Technique

9221 B.1, B.2
9221 B.1, B.2, B.3, B.4
9221 B.1, B.2-06.Presence-Absence (P-A) Coliform Test


9221 D.1, D.2, D.3Membrane Filtration Methods
Standard Total Coliform Membrane Filter Procedure using Endo Media


9222 B, CSimultaneous Detection of Total Coliforms and 
                                    *E. coli*
                                     by Dual Chromogen Membrane Filter Procedure (using mColiBlue24 medium)


9222 JSimultaneous Detection of Total Coliform Bacteria and 
                                    *Escherichia coli*
                                     Using RAPID'
                                    *E.coli*
                                     (REC2) in Drinking Water 56Enzyme Substrate Methods
Colilert®

9223 B
9223 B
9223 B-04.Colisure®

9223 B
9223 B
9223 B-04.Colilert-18
9223 B
9223 B
9223 B
9223 B-04.Tecta EC/TC 33
                                     43( print page 5792)Modified Colitag
                                    TM
                                    , Version 2.0 61*Escherichia coli*
*Escherichia coli*
                                     Procedure (following Lactose Fermentation Methods)
EC-MUG medium

9221 F.1
9221 F.1
9221 F.1-06.*Escherichia coli*
                                     Partitioning Methods (following Membrane Filtration Methods)
EC broth with MUG (EC-MUG)


9222 HNA-MUG medium


9222 ISimultaneous Detection of Total Coliforms and 
                                    *E. coli*
                                     by Dual Chromogen Membrane Filter Procedure
mColiBlue24 medium


9222 JMembrane Filtration Method
Simultaneous Detection of Total Coliform Bacteria and 
                                    *Escherichia coli*
                                     Using RAPID'
                                    *E.coli*
                                     (REC2) in Drinking Water 56Enzyme Substrate Methods
Colilert®

9223 B
9223 B
9223 B-04.Colisure®

9223 B
9223 B
9223 B-04.Colilert-18
9223 B
9223 B
9223 B
9223 B-04.Tecta EC/TC 33
                                     43Modified Colitag
                                    TM
                                    , Version 2.0 61
 Alternative Testing Methods for Contaminants Listed at 40 CFR 143.4(
                                b
                                )
Contaminant
Methodology
EPA method
ASTM 4
SM 21st
                                     edition 1
SM 22nd
                                     edition,28
                                     SM 23rd
                                     edition,49
                                     SM 24th
                                     edition 66
SM online 3Aluminum
Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Atomic Absorption; Direct


3111 D
3111 DAtomic Absorption; Furnace


3113 B
3113 B
3113 B-04, B-10.Inductively Coupled Plasma


3120 B
3120 BChloride
Silver Nitrate Titration

D 512-04 B, 12 B
4500-Cl−
                                    B
4500-Cl−
                                    BIon Chromatography

D 4327-11, -17
4110 B
4110 BPotentiometric Titration


4500-Cl−
                                    D
4500-Cl−
                                    DColor
Visual Comparison


2120 B
2120 BFoaming Agents
Methylene Blue Active Substances (MBAS)


5540 C
5540 CIron
Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Atomic Absorption; Direct


3111 B
3111 BAtomic Absorption; Furnace


3113 B
3113 B
3113 B-04, B-10Inductively Coupled Plasma


3120 B
3120 BManganese
Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Atomic Absorption; Direct


3111 B
3111 BAtomic Absorption; Furnace


3113 B
3113 B
3113 B-04, B-10.Inductively Coupled Plasma


3120 B
3120 B( print page 5793)Odor
Threshold Odor Test


2150 B
2150 BSilver
Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Atomic Absorption; Direct


3111 B
3111 BAtomic Absorption; Furnace


3113 B
3113 B
3113 B-04, B-10.Inductively Coupled Plasma


3120 B
3120 BSulfate
Ion Chromatography

D 4327-11, -17
4110 B
4110 BGravimetric with ignition of residue


4500-SO
                                    42−
                                    C
4500-SO
                                    42−
                                    C
4500-SO
                                    42−
                                    C-97.Gravimetric with drying of residue


4500-SO
                                    42−
                                    D
4500-SO
                                    42−
                                    D
4500-SO
                                    42−
                                    D-97.Turbidimetric method

D 516-07, 11, 16
4500-SO
                                    42−
                                    E
4500-SO
                                    42−
                                    E
4500-SO
                                    42−
                                    E-97.Automated methylthymol blue method


4500-SO
                                    42−
                                    F
4500-SO
                                    42−
                                    F
4500-SO
                                    42−
                                    F-97.Total Dissolved Solids
Total Dissolved Solids Dried at 180 deg C


2540 C
2540 CZinc
Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES)
200.5, Revision 4.2 2Atomic Absorption; Direct Aspiration


3111 B
3111 BInductively Coupled Plasma


3120 B
3120 B*         *         *         *         *         *         *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 Colitag
                                TM
                                 Method. “Modified Colitag
                                TM
                                 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® Method, “Readycult® 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® Method, “Chromocult® 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 TNTplusTM
                                 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*.
                                ( print 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. “Techta
                                TM
                                 EC/TC Medium and Techta
                                TM
                                 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 (Cl
                                2
                                ) 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° 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. “Tecta
                                TM
                                 EC/TC Medium and the Tecta
                                TM
                                 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 (
                                *Richard.jack@thermofisher.com*).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° 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 Colitag
                                TM
                                , Version 2.0. “Modified Colitag
                                TM
                                 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