89 FR 5773 Expedited Approval of Alternative Test Procedures for the Analysis of Contaminants under the Safe Drinking Water Act; Analysis and Sampling Procedures

ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 141

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

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

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

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:

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:

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:

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 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–O ₃ 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-SiO ₂ 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–ClO ₂ 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–NO ₃ –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–NO ₂ –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. 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)”;

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

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[FR Doc. 2024–01530 Filed 1–29–24; 8:45 am]

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