2024-01530: Expedited Approval of Alternative Test Procedures for the Analysis of Contaminants Under the Safe Drinking Water Act; Analysis and Sampling Procedures

A. Does this action apply to me?

Public water systems are the regulated entities required to measure contaminants in drinking water samples. In addition, EPA Regions as well as States and Tribal governments with authority to administer the regulatory program for public water systems under the Safe Drinking Water Act (SDWA) may measure contaminants in water samples. When EPA sets a monitoring requirement in its national primary drinking water regulations for a given contaminant, the agency also establishes (in the regulations) standardized test procedures for analysis of the contaminant. This action makes alternative testing methods available for particular drinking water contaminants beyond the testing methods currently established in the regulations. EPA is providing public water systems, required to test water samples, with a choice of using either a test procedure already established in the existing regulations or an alternative testing method that has been approved in this action or in prior expedited approval actions. Categories and entities that may ultimately be affected by this action include: ------------------------------------------------------------------------ Examples of potentially Category regulated entities NAICS \1\ ------------------------------------------------------------------------ State, local, & Tribal State, local, and 924110 governments. Tribal governments that analyze water samples on behalf of public water systems required to conduct such analysis; State, local, and Tribal governments that directly operate community and non- transient non- community water systems required to monitor. Industry....................... Private operators of 221310 community and non- transient non- community water systems required to monitor. Municipalities................. Municipal operators of 924110 community and non- transient non- community water systems required to monitor. ------------------------------------------------------------------------ \1\ North American Industry Classification System. This table is not intended to be exhaustive, but rather provides a guide for readers regarding entities likely to be interested in this action. Other types of entities not listed in the table could also have some interest. To determine whether your facility is affected by this action, you should carefully examine the applicability language in the Code of Federal Regulations (CFR) at 40 CFR 141.2 (definition of a public water system). If you have questions regarding the applicability of this action to a particular entity, consult the person listed in the preceding FOR FURTHER INFORMATION CONTACT section. Abbreviations and Acronyms Used in This Action CFR: Code of Federal Regulations EPA: United States Environmental Protection Agency NAICS: North American Industry Classification System QC: Quality Control SDWA: The Safe Drinking Water Act VCSB: Voluntary Consensus Standard Bodies

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.

1. ASTM International. EPA compared the most recent version of one

ASTM International method for determination of radium-226 by radon emanation to the earlier version of the method that is currently approved in 40 CFR 141.25(a). Changes between the earlier approved version and the most recent version of the method are described more fully in Smith 2023. The revisions involve primarily editorial changes (e.g., updated references, definitions, terminology, procedural clarifications, and reorganization of text). The revised method is the same as the approved version with respect to sample collection and handling protocols, sample preparation, analytical methodology, and method performance data; thus, EPA finds it is equally effective relative to the approved method. EPA is thus approving the use of the following ASTM method for radium-226 as listed in the following table: [[Page 5775]] ---------------------------------------------------------------------------------------------------------------- ASTM revised version Approved method Contaminant Regulation citation ---------------------------------------------------------------------------------------------------------------- D 3454-21 (ASTM 2021)............. D 3454-97 (ASTM 1997) Radium-226.......... 40 CFR 141.25(a). ---------------------------------------------------------------------------------------------------------------- The ASTM method is available from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 or https://www.astm.org.

2. Standard Methods for the Examination of Water and Wastewater

(Standard Methods). The 24th edition of Standard Methods for the Examination of Water and Wastewater (APHA 2023) was published in 2023. EPA compared 90 methods in the 24th edition to earlier versions of those methods that are currently approved in 40 CFR parts 141 and 143. Changes between the approved version and the version of each method published in the 24th edition are summarized in Smith and Wendelken (2023) and Best (2023). The revisions primarily involve editorial changes (e.g., correction of errors, procedural clarifications and reorganization of text). The methods in the following table are the same as the earlier approved versions with respect to the sample handling protocols, analytical procedures and method performance data. For these reasons, EPA has concluded that the versions in the 24th edition are equally effective relative to the currently approved versions in the regulations. Therefore, EPA is approving the use of 90 Standard Methods in the 24th edition for the contaminants and their respective regulations listed in the following table: ---------------------------------------------------------------------------------------------------------------- Standard methods, 24th edition (APHA 2023) Approved method Contaminant Regulation citations ---------------------------------------------------------------------------------------------------------------- 2120 B............................... 2120 B-01, online Color.................. 40 CFR 143.4(b). version (APHA 2001a). 2130 B............................... 2130 B-01, online Turbidity.............. 40 CFR 141.74(a)(1). version (APHA 2001b). 2150 B............................... 2150 B-97, online Odor................... 40 CFR 143.4(b). version (APHA 1997a). 2320 B............................... 2320 B-97, online Alkalinity............. 40 CFR 141.23(k)(1). version (APHA 1997b). 2510 B............................... 2510 B-97, online Conductivity........... 40 CFR 141.23(k)(1). version (APHA 1997c). 2540 C............................... 2540 C-97, online Total Dissolved Solids. 40 CFR 143.4(b). version (APHA 1997d). 2550................................. 2550-00, online version Temperature............ 40 CFR 141.23(k)(1). (APHA 2000a). 3111 B............................... 3111 B-99, online Calcium, copper, 40 CFR 141.23(k)(1); 40 version (APHA 1999a). magnesium, nickel, CFR 143.4(b). sodium, iron, manganese, silver, zinc. 3111 D............................... 3111 D-99, online Barium, aluminum....... 40 CFR 141.23(k)(1); 40 version (APHA 1999a). CFR 143.4(b). 3112 B............................... 3112 B-99, online Mercury................ 40 CFR 141.23(k)(1). version (APHA 1999b). 3113 B............................... 3113 B, 19th Edition Antimony, arsenic, 40 CFR 141.23(k)(1); 40 (APHA 1995). barium, beryllium, CFR 143.4(b). cadmium, chromium, copper, lead, nickel, selenium, aluminum, iron, manganese, silver. 3114 B............................... 3114 B-97, online Arsenic, selenium...... 40 CFR 141.23(k)(1). version (APHA 1997e). 3120 B............................... 3120 B-99, online Barium, beryllium, 40 CFR 141.23(k)(1); 40 version (APHA 1999c). calcium, chromium, CFR 143.4(b). copper, magnesium, nickel, silica, aluminum, iron, manganese, silver, zinc. 3500-Ca B............................ 3500-Ca B-97, online Calcium................ 40 CFR 141.23(k)(1). version (APHA 1997f). 3500-Mg B............................ 3500-Mg B-97, online Magnesium.............. 40 CFR 141.23(k)(1). version (APHA 1997g). 4110 B............................... 4110 B-00, online Fluoride, nitrate, 40 CFR 141.23(k)(1); 40 version (APHA 2000b). nitrite, ortho- CFR 143.4(b). phosphate, chloride, sulfate. 4500-Cl D,F,G,H...................... 4500-Cl D,F,G,H-00, Free chlorine.......... 40 CFR 141.74(a)(2); 40 online versions (APHA CFR 141.131(c)(1). 2000c). 4500-Cl D,E,F,G,I.................... 4500-Cl D,E,F,G,I-00, Total chlorine......... 40 CFR 141.74(a)(2); 40 online versions (APHA CFR 141.131(c)(1). 2000c). 4500-Cl D,F,G........................ 4500-Cl D,F,G-00, Combined chlorine...... 40 CFR 141.131(c)(1). online versions (APHA 2000c). 4500-Cl-B,D.......................... 4500-Cl-B,D-97, online Chloride............... 40 CFR 143.4(b). versions (APHA 1997h). 4500-ClO2 C.......................... 4500-ClO2 C-00, online Chlorine dioxide....... 40 CFR 141.74(a)(2). version (APHA 2000d). 4500-ClO2 E.......................... 4500-ClO2 E-00, online Chlorine dioxide....... 40 CFR 141.74(a)(2); 40 version (APHA 2000d). CFR 141.131(c)(1). 4500-ClO2 E.......................... 4500-ClO2 E-00, online Chlorite............... 40 CFR 141.131(b)(1). version (APHA 2000d). 4500-CN-C,E,F,G...................... 4500-CN-C,E,F,G, 20th Cyanide................ 40 CFR 141.23(k)(1). Edition (APHA 1998). 4500-F-B,C,D,E....................... 4500-F-B,C,D,E-97, Fluoride............... 40 CFR 141.23(k)(1). online versions (APHA 1997i). [[Page 5776]] 4500-H\+\ B.......................... 4500-H\+\ B-00, online pH..................... 40 CFR 141.23(k)(1). version (APHA 2000e). 4500-NO3-D........................... 4500-NO3-D-00, online Nitrate................ 40 CFR 141.23(k)(1). version (APHA 2000f). 4500-NO3-E,F......................... 4500-NO3-E,F-00, online Nitrate, nitrite....... 40 CFR 141.23(k)(1). versions (APHA 2000f). 4500-NO2-B........................... 4500-NO2-B-00, online Nitrite................ 40 CFR 141.23(k)(1). version (APHA 2000g). 4500-O3 B............................ 4500-O3 B-97, online Ozone.................. 40 CFR 141.74(a)(2). version (APHA 1997j). 4500-P E,F........................... 4500-P E,F, 19th Ortho-phosphate........ 40 CFR 141.23(k)(1). Edition, (APHA 1995). 4500-SiO2 C,D,E...................... 4500-SiO2 C,D,E-97, Silica................. 40 CFR 141.23(k)(1). online versions (APHA 1997k). 4500-SO4\2\-C,D,E,F.................. 4500-SO4\2\-C,D,E,F, Sulfate................ 40 CFR 143.4(b). 19th Edition (APHA 1995). 5310 B,C............................. 5310 B,C-00, online Dissolved and Total 40 CFR 141.131(d). versions (APHA 2000h). Organic Carbon. 5540 C............................... 5540 C-00, online Foaming agents......... 40 CFR 143.4(b). version (APHA 2000i). 5910 B............................... 5910 B-00, online UV Absorption at 254 nm 40 CFR 141.131(d). version (APHA 2000j). 6251 B............................... 6251 B-94, online HAA5................... 40 CFR 141.131(b)(1). version (APHA 1994). 6610 B............................... EPA Method 531.2, Rev. Carbofuran, oxamyl..... 40 CFR 141.24(e)(1). 1.0 (USEPA 2001). 6640 B............................... EPA Method 515.4, Rev. 2,4-D; 2,4,5-TP; 40 CFR 141.24(e)(1). 1.0 (USEPA 2000). Dalapon; Dinoseb; Pentachlorophenol; Picloram. 6651 B............................... 6651 B, 20th Edition, Glyphosate............. 40 CFR 141.24(e)(1). (APHA 1998). 7110 B............................... 7110 B-00, online Gross alpha and gross 40 CFR 141.25(a). version (APHA 2000k). beta. 7110 C............................... 7110 C-00, online Gross alpha............ 40 CFR 141.25(a). version (APHA 2000k). 7110 D............................... EPA Method 900.0 (USEPA Gross alpha and gross 40 CFR 141.25(a). 1980). beta. 7120................................. 7120-97, online version Gamma emitters 40 CFR 141.25(a). (APHA 1997l). (includes radioactive cesium and iodine). 7500-Cs B............................ 7500-Cs B-00, online Radioactive Cesium and 40 CFR 141.25(a). version (APHA 2000l). Gamma emitters. 7500-\3\H B.......................... 7500-\3\H B-00, online Tritium................ 40 CFR 141.25(a). version (APHA 2000m). 7500-I B............................. 7500-I B-00, online Radioactive Iodine and 40 CFR 141.25(a). version (APHA 2000n). Gamma emitters. 7500-I C,D........................... 7500-I C,D-00, online Radioactive Iodine..... 40 CFR 141.25(a). versions (APHA 2000n). 7500-Ra B,C.......................... 7500-Ra B,C-01, online Radium-226............. 40 CFR 141.25(a). versions (APHA 2001c). 7500-Ra D............................ 7500-Ra D-01, online Radium-228............. 40 CFR 141.25(a). version (APHA 2001c). 7500-Ra E............................ GA Method (2004)....... Radium-226 and Radium- 40 CFR 141.25(a). 228. 7500-Sr B............................ 7500-Sr B-01, online Strontium-89 and 40 CFR 141.25(a). version (APHA 2001d). Strontium-90. 7500-U B,C........................... 7500-U B,C-00, online Uranium................ 40 CFR 141.25(a). versions (APHA 2000o). 9221 A,C............................. 9221 A,C, 20th Edition, Total coliforms........ 40 CFR 141.74(a)(1). (APHA 1998). 9221 B............................... 9221 B, 20th Edition, Total coliforms........ 40 CFR 141.74(a)(1) 40 (APHA 1998). CFR 141.852(a)(5) [B.1, B.2, B.3, B.4]. 9221 D............................... 9221 D, 20th Edition, Total coliforms........ 40 CFR 141.852(a)(5) (APHA 1998). [D.1, D.2, D.3]. 9221 E............................... 9221 E, 20th Edition, Fecal coliforms........ 40 CFR 141.74(a)(1). (APHA 1998). 9221 F............................... 9221 F, 20th Edition, E. coli................ 40 CFR 141.402(c)(2) 40 (APHA 1998). CFR 141.852(a)(5) [F.1]. 9222 A............................... 9222 A 20th Edition, Total coliforms........ 40 CFR 141.74(a)(1). (APHA 1998). 9222 B,C............................. 9222 B,C, 20th Edition, Total coliforms........ 40 CFR 141.74(a)(1) 40 (APHA 1998). CFR 141.852(a)(5). 9222 D............................... 9222 D, 20th Edition, Fecal coliforms........ 40 CFR 141.74(a)(1). (APHA 1998). 9222 H............................... 9222 G, 20th Edition, E. coli................ 40 CFR 141.852(a)(5). (APHA 1998). 9222 I............................... 9222 G, 20th Edition, E. coli................ 40 CFR 141.402(c)(2) 40 (APHA 1998). CFR 141.852(a)(5). 9222 J............................... m-ColiBlue24 Test (Hach Total coliforms........ 40 CFR 141.852(a)(5). Company 1999). 9222 J............................... m-ColiBlue24 Test (Hach E. coli................ 40 CFR 141.402(c)(2) 40 Company 1999). CFR 141.852(a)(5). 9223 B............................... 9223 B, 20th Edition Total coliforms........ 40 CFR 141.74(a)(1); 40 (APHA 1998). CFR 141.852(a)(5). [[Page 5777]] 9223 B............................... 9223 B, 20th Edition E. coli................ 40 CFR 141.402(c)(2); (APHA 1998). 40 CFR 141.852(a)(5). 9230 B............................... 9230 C, 20th Edition Enterococci............ 40 CFR 141.402(c)(2). (APHA 1998). 9230 C............................... 9230 C, 20th Edition Enterococci............ 40 CFR 141.402(c)(2). (APHA 1998). 9230 D............................... (Budnick 1996)......... Enterococci............ 40 CFR 141.402(c)(2). ---------------------------------------------------------------------------------------------------------------- The 24th edition can be obtained from the American Public Health Association (APHA), 800 I Street NW, Washington, DC 20001-3710. Approved online versions are available at http://www.standardmethods.org.

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.

D. Heteropoly Blue Method. E. Automated Method for Molybdate-

Reactive Silica. Approved by Standard Methods Committee 1997. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 1997l. Standard Method 7120 B-97. Gamma-Emitting Radionuclides. B. Gamma Spectroscopic Method. Approved by Standard Methods Committee 1997. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 1998. 20th Edition of Standard Methods for the Examination of Water and Wastewater. American Public Health Association, 800 I Street NW, Washington, DC 20001-3710. American Public Health Association (APHA). 1999a. Standard Methods 3111 B, D-99. Metals by Flame Atomic Absorption Spectrometry. B. Direct Air-Acetylene Flame Method. D. Direct Nitrous Oxide-Acetylene Flame Method. Approved by Standard Methods Committee 1999. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 1999b. Standard method 3112 B-99. Metals by Cold-Vapor Atomic Absorption Spectrometry. B. Cold-Vapor Spectrometric Method. Approved by Standard Methods Committee 1999. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 1999c. Standard Method 3120 B-99. Metals by Plasma Emission Spectroscopy. B. Inductively Coupled Plasma (ICP) Method. Approved by Standard Methods Committee 1999. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 1999d. Standard Method 4500-CN-C-99. Cyanide. C. Total Cyanide after Distillation. Approved by Standard Methods Committee 1999. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000a. Standard Method 2550-00. Temperature. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000b. Standard Method 4110 B-00. Determination of Anions by Ion Chromatography. B. Ion Chromatography with Chemical Suppression of Eluent Conductivity. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000c. Standard Methods 4500-Cl D, E, F, G, H, I-00. Chlorine (Residual). D. Amperometric Titration Method. E. Low-Level Amperometric Titration Method. F. DPD Ferrous Titrimetric Method. G. DPD Colorimetric Method. H. Syringaldehyde (FACTS) Method. I. Iodometric Electrode Technique. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000d. Standard Methods 4500-ClO2 C, E-00. Chlorine Dioxide. C. Amperometric Method I. E. Amperometric Method II. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000e. Standard Method 4500-H\+\ B-00. pH Value. B. Electrometric Method. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000f. Standard Methods 4500-NO3-D, E, F-00. Nitrogen (Nitrate). D. Nitrate Electrode Method. E. Cadmium Reduction Method. F. Automated Cadmium Reduction Method. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000g. Standard Method 4500-NO2-B-00. Nitrogen (Nitrite). B. Colorimetric Method. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000h. Standard Methods 5310 B, C-00. Total Organic Carbon (TOC). B. High Temperature Combustion Method. C. Persulfate-Ultraviolet or Heated Persulfate Oxidation Method. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000i. Standard Method 5540 C-00. Surfactants. C. Anionic Surfactants as MBAs. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000j. Standard Method 5910 B-00. UV-Absorbing Organic Constituents. B. Ultraviolet Absorption Method. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000k. Standard Methods 7110 B,C-00. Gross Alpha and Gross Beta Radioactivity (Total, Suspended, and Dissolved). B. Evaporation Method for Gross Alpha- Beta. C. Coprecipitation Method for Alpha Radioactivity in Drinking Water. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000l. Standard Method 7500-Cs B-00. Radioactive Cesium. B. Precipitation Method. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000m. Standard Method 7500-\3\H B-00. Tritium. Liquid Scintillation Spectrometric Method. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000n. Standard Methods 7500-I B, C, D-00. Radioactive Iodine. B. Precipitation Method. C. Ion-Exchange Method. D. Distillation Method. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2000o. Standard Methods 7500-U B, C-00. Uranium. B. Radiochemical Method. C. Isotopic Method. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2001a. Standard Method 2120 B-01. Color. B. Visual Comparison Method. Approved by Standard Methods Committee 2001. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2001b. Standard Method 2130 B-01. [[Page 5779]] Turbidity. B. Nephelometric Method. Approved by Standard Methods Committee 2001. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2001c. Standard Methods 7500-Ra B, C, D, E-01. Radium. B. Precipitation Method. C. Emanation Method. D. Sequential Precipitation. E. Gamma Spectroscopy Method. Approved by Standard Methods Committee 2001. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2001d. Standard Method 7500-Sr B-01. Total Radioactive Strontium and Strontium-90. B. Precipitation Method. Approved by Standard Methods Committee 2000. Standard Methods Online (Available at https://www.standardmethods.org) American Public Health Association (APHA). 2023. 24th Edition of Standard Methods for the Examination of Water and Wastewater. American Public Health Association, 800 I Street NW, Washington, DC 20001-3710. ASTM International. 1997. ASTM D 3454-97. Standard Test Method for Radium-226 in Water. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. (Available at https://www.astm.org.) ASTM International. 2021. ASTM D 3454-21. Standard Test Method for Radium-226 in Water. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. (Available at https://www.astm.org.) Best, J. 2023. Memo to the record describing basis for expedited approval of methods in the 24th edition of Standard Methods for the Examination of Water and Wastewater. August 10, 2023. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.) Budnick. 1996. Evaluation of Enterolert for Enumeration of Enterococci in Recreational Waters, Applied and Environmental Microbiology, October 1996, p. 3881-3884. GA. 2004. Method for the Determination of Radium-228 and Radium-226 in Drinking Water by Gamma-ray Spectrometry using HPGE or Ge(Li) Detectors. December 2004. Revision 1.2. Environmental Resource Center, Georgia Institute for Technology, 620 Cherry Street, Atlanta, Georgia 30332-0335. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.) Hach Company. 2022a. Hach Method 10312. Spectrophotometric Measurement of Fluoride in Finished Drinking Water Aluminum- Chromeazurol S complex (AL-CAS) Using Planar Reagent-filled Cuvettes. August 2022. Revision 1.0. Hach Company, 5600 Lindbergh Drive, Loveland, Colorado 80539. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.) Hach Company. 2022b. Alternate Test Procedure (ATP) Validation Study Report of Hach Method 10312 for the Determination of Fluoride in Finished Drinking Water Using Planar Reagent-filled Cuvettes. August 2022. Hach Company, 5600 Lindbergh Drive, Loveland, Colorado 80539. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW- 2023-0541.) Hach Company. 1999. Total Coliforms and E. coli Membrane Filtration Method m-ColiBlue24[supreg] Broth. August 1999. Revision 2. Hach Company, 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW- 2023-0541.) Smith, G. 2023. Memo to the record describing basis for expedited approval of updated method from ASTM International. April 2023. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW- 2023-0541.) Smith, G. and Wendelken, S. 2023. Memo to the record describing basis for expedited approval of methods in the 24th edition of Standard Methods for the Examination of Water and Wastewater. June 2023. (Available at https://www.regulations.gov; docket ID No. EPA- HQ-OW-2023-0541.) USEPA. 1980. EPA Method 904.0. Radium-228 in Drinking Water in ``Prescribed Procedures for Measurement of Radioactivity in Drinking Water,'' EPA-600/4-80-032, August 1980. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.) USEPA. 1993. EPA Method 180.1, Revision 2.0. Determination of Turbidity by Nephelometry in ``Methods for the Determination of Inorganic Substances in Environmental Samples,'' EPA/600/R-93/100, August 1993. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.) USEPA. 2000. EPA Method 515.4, Revision 1.0. Determination of Chlorinated Acids in Drinking Water by Liquid-Liquid Microextraction, Derivatization and Fast Gas Chromatography with Electron Capture Detection. EPA/815/B-00/001. April 2000. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541 and at https://www.nemi.gov.) USEPA. 2001. EPA Method 531.2, Revision 1.0. Measurement of N- methylcarbamoyloximes and N-methylcarbamates in Water by Direct Aqueous Injection HPLC with Postcolumn Derivatization. EPA 815-B-01- 002. September 2001. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541 and at https://www.nemi.gov.) Yokogawa Electric Corporation. 2022a. Yokogawa Method 820. Measurement of Turbidity in Drinking Water by Right Angle Scattered Light Turbidity Analyzer. November 30, 2022. Revision 1.0. Yokogawa Electric Corporation, 2-9-32 Nakamachi, Musashino-shi, Tokyo, Japan 180-8750. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.) Yokogawa Electric Corporation. 2022b. Alternate Test Procedure (ATP) Validation Study Report of Yokogawa Method 820 for the Measurement of Turbidity in Drinking Water by Right Angle Scattered Light Turbidity Analyzer. November 8, 2022. Yokogawa Electric Corporation, 2-9-32 Nakamachi, Musashino-shi, Tokyo, Japan 180-8750. (Available at https://www.regulations.gov; docket ID No. EPA-HQ-OW-2023-0541.) List of Subjects in 40 CFR Part 141 Environmental protection, Chemicals, Indians--lands, Intergovernmental relations, Reporting and recordkeeping requirements, Water supply. Jennifer L. McLain, Director, Office of Ground Water and Drinking Water. For the reasons stated in the preamble, the Environmental Protection Agency amends 40 CFR part 141 as follows: PART 141--NATIONAL PRIMARY DRINKING WATER REGULATIONS 0

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

Authority: 42 U.S.C. 300f, 300g-1, 300g-2, 300g-3, 300g-4, 300g-5, 300g-6, 300j-4, 300j-9, and 300j-11. 0

2. Amend Appendix A to subpart C of part 141 by:

0 a. Revising the table entitled ``Alternative Testing Methods for Contaminants Listed at 40 CFR 141.23(k)(1)''; 0 b. Revising the table entitled ``Alternative Testing Methods for Contaminants Listed at 40 CFR 141.24(e)(1)''; 0 c. Revising the table entitled ``Alternative Testing Methods for Contaminants Listed at 40 CFR 141.25(a)''; 0 d. Revising the table entitled ``Alternative Testing Methods for Contaminants Listed at 40 CFR 141.74(a)(1)''; 0 e. Revising the table entitled ``Alternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.74(a)(2)''; 0 f. Revising the table entitled ``Alternative Testing Methods for Contaminants Listed at 40 CFR 141.131(b)(1)''; 0 g. Revising the table entitled ``Alternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.131(c)(1)''; 0 h. Revising the table entitled ``Alternative Testing Methods for Parameters Listed at 40 CFR 141.131(d)''; 0 i. Revising the table entitled ``Alternative Testing Methods for Contaminants Listed at 40 CFR 141.402(c)(2)''; [[Page 5780]] 0 j. Revising the table entitled ``Alternative Testing Methods for Contaminants Listed at 40 CFR 141.852(a)(5)''; 0 k. Revising the table entitled ``Alternative Testing Methods for Contaminants Listed at 40 CFR 143.4(b)''; The revisions and additions read as follows: Appendix A to Subpart C of Part 141--Alternative Testing Methods Approved for Analyses Under the Safe Drinking Water Act * * * * * Alternative Testing Methods for Contaminants Listed at 40 CFR 141.23(k)(1) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ SM 23rd Contaminant Methodology EPA method SM 21st edition SM 22nd edition edition,\49\ SM SM online \3\ ASTM \4\ Other \1\ \28\ 24th edition \66\ ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Alkalinity...................... Titrimetric....... .................. 2320 B............ 2320 B............ 2320 B............ .................. D1067-06 B, 11 B, 16 B. Antimony........................ Hydride--Atomic .................. .................. .................. .................. .................. D 3697-07, -12, - Absorption. 17. Atomic Absorption; .................. 3113 B............ 3113 B............ 3113 B............ 3113 B-04, B-10... Furnace. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Arsenic......................... Atomic Absorption; .................. 3113 B............ 3113 B............ 3113 B............ 3113 B-04, B-10... D 2972-08 C, -15 C Furnace. Hydride Atomic .................. 3114 B............ 3114 B............ 3114 B............ 3114 B-09......... D 2972-08 B, -15 B Absorption. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Barium.......................... Inductively .................. 3120 B............ 3120 B............ 3120 B............ Coupled Plasma. Atomic Absorption; .................. 3111 D............ 3111 D............ 3111 D............ Direct. Atomic Absorption; .................. 3113 B............ 3113 B............ 3113 B............ 3113 B-04, B-10... Furnace. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Beryllium....................... Inductively .................. 3120 B............ 3120 B............ 3120 B............ Coupled Plasma. Atomic Absorption; .................. 3113 B............ 3113 B............ 3113 B............ 3113 B-04, B-10... D 3645-08 B, -15 B Furnace. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Cadmium......................... Atomic Absorption; .................. 3113 B............ 3113 B............ 3113 B............ 3113 B-04, B-10... Furnace. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Calcium......................... EDTA titrimetric.. .................. 3500-Ca B......... 3500-Ca B......... 3500-Ca B......... .................. D 511-09, -14 A... Atomic Absorption; .................. 3111 B............ 3111 B............ 3111 B............ .................. D 511-09, -14 B... Direct Aspiration. [[Page 5781]] Inductively .................. 3120 B............ 3120 B............ 3120 B............ Coupled Plasma. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Ion Chromatography .................. .................. .................. .................. .................. D 6919-09, -17.... Chromium........................ Inductively .................. 3120 B............ 3120 B............ 3120 B............ Coupled Plasma. Atomic Absorption; .................. 3113 B............ 3113 B............ 3113 B............ 3113 B-04, B-10... Furnace. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Copper.......................... Atomic Absorption; .................. 3113 B............ 3113 B............ 3113 B............ 3113 B-04, B-10... D 1688-07, -12 C, Furnace. 17 C. Atomic Absorption; .................. 3111 B............ 3111 B............ 3111 B............ .................. D 1688-07, -12 A, Direct Aspiration. 17 A. Inductively .................. 3120 B............ 3120 B............ 3120 B............ Coupled Plasma. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Colorimetry....... .................. .................. .................. .................. .................. .................. Hach Method 8026,\35\ Hach Method 10272.\36\ Conductivity.................... Conductance....... .................. 2510 B............ 2510 B............ 2510 B............ .................. D 1125-14 A....... Cyanide......................... Manual .................. 4500-CN-C......... 4500-CN-C......... 4500-CN-C......... 4500-CN-C-99...... D 2036-06 A....... Distillation with MgCl2 followed by:. Spectrophotometric .................. 4500-CN-G......... 4500-CN-G......... 4500-CN-G......... .................. D 2036-06 B....... , Amenable. Spectrophotometric .................. 4500-CN-E......... 4500-CN-E......... 4500-CN-E......... .................. D2036-06 A........ Manual. Selective .................. 4500-CN-F......... 4500-CN-F......... 4500-CN-F......... Electrode. Gas Chromatography/ .................. .................. .................. .................. .................. .................. ME355.01.\7\ Mass Spectrometry Headspace. Fluoride........................ Ion Chromatography .................. 4110 B............ 4110 B............ 4110 B............ .................. D 4327-11, -17.... Manual .................. 4500-F-B, D....... 4500-F-B, D....... 4500-F-B, D....... Distillation; Colorimetric SPADNS. Manual Electrode.. .................. 4500-F-C.......... 4500-F-C.......... 4500-F-C.......... .................. D 1179-04, 10 B, 16 B. Automated Alizarin .................. 4500-F-E.......... 4500-F-E.......... 4500-F-E.......... Arsenite-Free .................. .................. .................. .................. .................. .................. Hach SPADNS 2 Colorimetric Method 10225,\22\ SPADNS. Hach Method 10312.\67\ [[Page 5782]] Lead............................ Atomic Absorption; .................. 3113 B............ 3113 B............ 3113 B............ 3113 B-04, B-10... D 3559-08 D, 15 D. Furnace. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Differential Pulse .................. .................. .................. .................. .................. .................. Method 1001, Rev. Anodic Stripping 1.1.\57\ Voltametry. Magnesium....................... Atomic Absorption. .................. 3111 B............ 3111 B............ 3111 B............ .................. D 511-09, -14 B... Inductively .................. 3120 B............ 3120 B............ 3120 B............ Coupled Plasma. Complexation .................. 3500-Mg B......... 3500-Mg B......... 3500-Mg B......... .................. D 511-09, -14 A... Titrimetric Methods. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Ion Chromatography .................. .................. .................. .................. .................. D 6919-09, -17.... Mercury......................... Manual, Cold Vapor .................. 3112 B............ 3112 B............ 3112 B............ 3112 B-09......... D 3223-12, -17.... Nickel.......................... Inductively .................. 3120 B............ 3120 B............ 3120 B............ Coupled Plasma. Atomic Absorption; .................. 3111 B............ 3111 B............ 3111 B............ Direct. Atomic Absorption; .................. 3113 B............ 3113 B............ 3113 B............ 3113 B-04, B-10... Furnace. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Nitrate......................... Ion Chromatography .................. 4110 B............ 4110 B............ 4110 B............ .................. D 4327-11, -17.... Automated Cadmium .................. 4500-NO3-F........ 4500-NO3-F........ 4500-NO3-F........ Reduction. Manual Cadmium .................. 4500-NO3- E....... 4500-NO3- E....... 4500-NO3- E....... Reduction. Ion Selective .................. 4500-NO3- D....... 4500-NO3- D....... 4500-NO3- D....... Electrode. Reduction/ .................. .................. .................. .................. .................. .................. Systea Easy (1- Colorimetric. Reagent),\8\ NECi Nitrate- Reductase.\40\ Colorimetric; .................. .................. .................. .................. .................. .................. Hach TNTplus\TM\ Direct. 835/836 Method 10206.\23\ Capillary Ion .................. .................. .................. .................. .................. D 6508-15......... Electrophoresis. Nitrite......................... Ion Chromatography .................. 4110 B............ 4110 B............ 4110 B............ .................. D 4327-11, -17.... Automated Cadmium .................. 4500-NO3-F........ 4500-NO3-F........ 4500-NO3-F........ Reduction. Manual Cadmium .................. 4500-NO3-E........ 4500-NO3-E........ 4500-NO3-E........ Reduction. [[Page 5783]] Spectrophotometric .................. 4500-NO2-B........ 4500-NO2-B........ 4500-NO2-B........ Reduction/ .................. .................. .................. .................. .................. .................. Systea Easy (1- Colorimetric. Reagent),\8\ NECi Nitrate- Reductase.\40\ Capillary Ion .................. .................. .................. .................. .................. D 6508-15......... Electrophoresis. Ortho-phosphate................. Ion Chromatography .................. 4110 B............ 4110 B............ 4110 B............ .................. D 4327-11, -17.... Colorimetric, .................. 4500-P E.......... 4500-P E.......... 4500-P E.......... 4500-P E-99....... ascorbic acid, single reagent. Colorimetric, .................. 4500-P F.......... 4500-P F.......... 4500-P F.......... 4500-P F-99....... Thermo Fisher Automated, Discrete Ascorbic Acid. Analyzer.\41\. Capillary Ion .................. .................. .................. .................. .................. D 6508-15......... Electrophoresis. pH.............................. Electrometric..... \48\ 150.3........ 4500-H\+\ B....... 4500-H\+\ B....... 4500-H\+\ B....... .................. D 1293-12, -18.... Selenium........................ Hydride-Atomic .................. 3114 B............ 3114 B............ 3114 B............ 3114 B-09......... D 3859-08 A, -15 A Absorption. Atomic Absorption; .................. 3113 B............ 3113 B............ 3113 B............ 3113 B-04, B-10... D 3859-08 B, -15 B Furnace. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Silica.......................... Colorimetric...... .................. .................. .................. .................. .................. D859-05, 10, 16... Molybdosilicate... .................. 4500-SiO2 C....... 4500-SiO2 C....... 4500-SiO2 C....... Heteropoly blue... .................. 4500-SiO2 D....... 4500-SiO2 D....... 4500-SiO2 D....... Automated for .................. 4500-SiO2 E....... 4500-SiO2 E....... 4500-SiO2 E....... Molybdate- reactive Silica. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Inductively .................. 3120 B............ 3120 B............ 3120 B............ Coupled Plasma. Sodium.......................... Atomic Absorption; .................. 3111 B............ 3111 B............ 3111 B............ Direct Aspiration. Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Ion Chromatography .................. .................. .................. .................. .................. D 6919-09, -17.... Temperature..................... Thermometric...... .................. 2550.............. 2550.............. 2550.............. 2550-10........... ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ [[Page 5784]] Alternative Testing Methods for Contaminants Listed at 40 CFR 141.24(e)(1) -------------------------------------------------------------------------------------------------------------------------------------------------------- SM 22nd edition,\28\ SM SM 21st edition 23rd Contaminant Methodology EPA method \1\ edition,\49\ SM SM online \3\ ASTM \4\ Other 24th edition \66\ -------------------------------------------------------------------------------------------------------------------------------------------------------- Benzene...................... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. Carbon tetrachloride......... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. Chlorobenzene................ Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. 1,2-Dichlorobenzene.......... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. 1,4-Dichlorobenzene.......... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. 1,2-Dichloroethane........... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. cis-Dichloroethylene......... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. trans-Dichloroethylene....... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. Dichloromethane.............. Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. 1,2-Dichloropropane.......... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. Ethylbenzene................. Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. Styrene...................... Purge &Trap/Gas 524.3,\9\ 524.4 Chromatography/ \29\. Mass Spectrometry. Tetrachloroethylene.......... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. 1,1,1-Trichloroethane........ Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. Trichloroethylene............ Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. Toluene...................... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. 1,2,4-Trichlorobenzene....... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. 1,1-Dichloroethylene......... Purge &Trap/Gas 524.3,\9\ 524.4 Chromatography/ \29\. Mass Spectrometry. 1,1,2-Trichlorethane......... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. [[Page 5785]] Vinyl chloride............... Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. Xylenes (total).............. Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. 2,4-D........................ Gas ................ 6640 B.......... 6640 B.......... 6640 B-01, B-06 D 5317-20...... Chromatography/ Electron Capture Detection (GC/ ECD). 2,4,5-TP (Silvex)............ Gas ................ 6640 B.......... 6640 B.......... 6640 B-01, B-06 D 5317-20...... Chromatography/ Electron Capture Detection (GC/ ECD). Alachlor..................... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Atrazine..................... Liquid 536.\25\ Chromatography Electrospray Ionization Tandem Mass Spectrometry (LC/ESI-MS/MS). Solid Phase 525.3,\24\ Extraction/Gas 523.\26\ Chromatography/ Mass Spectrometry (GC/MS). Benzo(a)pyrene............... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Carbofuran................... High-performance ................ 6610 B.......... 6610 B.......... 6610 B-04...... liquid chromatography (HPLC) with post-column derivatization and fluorescence detection. Liquid ................ ................ ................ ............... ............... ME 531.\58\ Chromatography/ Mass Spectrometry. Chlordane.................... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Dalapon...................... Ion 557.\14\ Chromatography Electrospray Ionization Tandem Mass Spectrometry (IC-ESI-MS/MS). Gas ................ 6640 B.......... 6640 B.......... 6640 B-01, B-06 Chromatography/ Electron Capture Detection (GC/ ECD). [[Page 5786]] Di(2-ethylhexyl)adipate...... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Di(2-ethylhexyl)phthalate.... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Dibromochloropropane (DBCP).. Purge &Trap/Gas 524.3.\9\ Chromatography/ Mass Spectrometry. Dinoseb...................... Gas ................ 6640 B.......... 6640 B.......... 6640 B-01, B-06 Chromatography/ Electron Capture Detection (GC/ ECD). Endrin....................... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Ethyl dibromide (EDB)........ Purge &Trap/Gas 524.3.\9\ Chromatography/ Mass Spectrometry. Glyphosate................... High-Performance ................ 6651 B.......... 6651 B.......... 6651 B-00, B-05 Liquid Chromatography (HPLC) with Post-Column Derivatization and Fluorescence Detection. Heptachlor................... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Heptachlor Epoxide........... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Hexachlorobenzene............ Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Hexachlorocyclo-pentadiene... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Lindane...................... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Methoxychlor................. Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). [[Page 5787]] Oxamyl....................... High-performance ................ 6610 B.......... 6610 B.......... 6610 B-04...... liquid chromatography (HPLC) with post-column derivatization and fluorescence detection. Liquid Chromatography/Mass ................ ................ ................ ................ ............... ME 531.\58\.... Spectrometry. PCBs (as Aroclors)........... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Pentachlorophenol............ Gas ................ 6640 B.......... 6640 B.......... 6640 B-01, B-06 D 5317-20...... Chromatography/ Electron Capture Detection (GC/ ECD). Solid Phase Extraction/Gas 525.3.\24\ Chromatography/Mass Spectrometry (GC/MS). Picloram..................... Gas ................ 6640 B.......... 6640 B.......... 6640 B-01, B-06 D 5317-20...... Chromatography/ Electron Capture Detection (GC/ ECD). Simazine..................... Liquid 536.\25\ Chromatography Electrospray Ionization Tandem Mass Spectrometry (LC/ESI-MS/MS). Solid Phase Extraction/Gas 525.3,\24\ Chromatography/Mass 523.\26\ Spectrometry (GC/MS). Toxaphene.................... Solid Phase 525.3.\24\ Extraction/Gas Chromatography/ Mass Spectrometry (GC/MS). Total Trihalomethanes........ Purge &Trap/Gas 524.3,\9\ Chromatography/ 524.4.\29\ Mass Spectrometry. -------------------------------------------------------------------------------------------------------------------------------------------------------- Alternative Testing Methods for Contaminants Listed at 40 CFR 141.25(a) -------------------------------------------------------------------------------------------------------------------------------------------------------- SM 22nd edition,\28\ SM Contaminant Methodology EPA method SM 21st edition 23rd edition,\49\ ASTM \4\ SM online \3\ \1\ SM 24th edition \66\ -------------------------------------------------------------------------------------------------------------------------------------------------------- Naturally Occurring: Gross alpha and beta........ Evaporation....... 900.0, Rev. 1.0 7110 B............ 7110 B............ \50\. Liquid .................. .................. 7110 D............ D 7283-17......... 7110 D-17. Scintillation. Gross alpha................. Coprecipitation... .................. 7110 C............ 7110 C............ Radium 226.................. Radon emanation... 903.1, Rev. 1.0 7500-Ra C......... 7500-Ra C......... D 3454-05, -18, D \53\. 3454-21. Radiochemical..... 903.0, Rev. 1.0 7500-Ra B......... 7500-Ra B......... D 2460-07......... \54\. Gamma Spectrometry .................. .................. 7500-Ra E......... .................. 7500-Ra E-07. Radium 228.................. Radiochemical..... 904.0, Rev. 1.0 7500-Ra D......... 7500-Ra D......... \62\. Gamma Spectrometry .................. .................. 7500-Ra E......... .................. 7500-Ra E-07. Uranium..................... Radiochemical..... .................. 7500-U B.......... 7500-U B.......... ICP-MS............ .................. 3125.............. .................. D 5673-05, 10, 16. [[Page 5788]] Alpha spectrometry .................. 7500-U C.......... 7500-U C.......... D 3972-09......... Laser .................. .................. .................. D 5174-07......... Phosphorimetry. Alpha Liquid .................. .................. .................. D 6239-09......... Scintillation Spectrometry. Man-Made: Radioactive Cesium.......... Radiochemical..... .................. 7500-Cs B......... 7500-Cs B......... Gamma Ray .................. 7120.............. 7120.............. D 3649-06......... Spectrometry. Radioactive Iodine.......... Radiochemical..... .................. 7500-I B, 7500-I 7500-I B, 7500-I D 3649-06......... C, 7500-I D. C, 7500-I D. Gamma Ray .................. 7120.............. 7120.............. D 4785-08, -20.... Spectrometry. Radioactive Strontium 89, 90 Radiochemical..... .................. 7500-Sr B......... 7500-Sr B......... Tritium..................... Liquid .................. 7500-\3\H B....... 7500-\3\H B....... D 4107-08, -20.... Scintillation. Gamma Emitters.............. Gamma Ray .................. 7120, 7500-Cs B, 7120, 7500-Cs B, D 3649-06, D 4785- Spectrometry. 7500-I B. 7500-I B. 08, -20. -------------------------------------------------------------------------------------------------------------------------------------------------------- Alternative Testing Methods for Contaminants Listed at 40 CFR 141.74(a)(1) -------------------------------------------------------------------------------------------------------------------------------------------------------- SM 21st edition SM 22nd edition SM 23rd edition SM 24th edition Organism Methodology \1\ \28\ \49\ \66\ SM online \3\ Other -------------------------------------------------------------------------------------------------------------------------------------------------------- Total Coliform............... Total Coliform 9221 A, B, C.... 9221 A, B, C.... 9221 A, B, C.... 9221 A, B, C... 9221 A, B, C-06 Fermentation Technique. Total Coliform 9222 A, B, C.... ................ 9222 A, B, C.... 9222 A, B, C... Membrane Filter Technique. ONPG-MUG Test... 9223............ 9223 B.......... 9223 B.......... 9223 B......... 9223 B-04...... Fecal Coliforms.............. Fecal Coliform 9221 E.......... 9221 E.......... 9221 E.......... 9221 E......... 9221 E-06...... Procedure. Fecal Coliform 9222 D.......... 9222 D.......... 9222 D.......... 9222 D......... 9222 D-06...... Filter Procedure. Heterotrophic bacteria....... Pour Plate 9215 B.......... 9215 B.......... 9215 B.......... ............... 9215 B-04...... Method. Turbidity.................... Nephelometric 2130 B.......... 2130 B.......... 2130 B.......... 2130 B......... ............... Hach Method Method. 8195, Rev. 3.0.\52\ Laser ................ ................ ................ ............... ............... Mitchell Nephelometry M5271,\10\ (on-line). Mitchell M5331, Rev. 1.2,\42\ Lovibond PTV 6000.\46\ LED Nephelometry ................ ................ ................ ............... ............... Mitchell (on-line). M5331,\11\ Mitchell M5331, Rev. 1.2,\42\ Lovibond PTV 2000,\45\ Yokogawa 820.\68\ LED Nephelometry ................ ................ ................ ............... ............... AMI (on-line). Turbiwell,\15\ Lovibond PTV 1000.\44\ LED Nephelometry ................ ................ ................ ............... ............... Orion (portable). AQ4500,\12\ Lovibond TB 3500,\64\ Lovibond TB 5000.\65\ Laser ................ ................ ................ ............... ............... Lovibond TB Nephelometry 6000.\63\ (portable). 360[deg] ................ ................ ................ ............... ............... Hach Method Nephelometry. 10258, Rev. 1.0,\39\ Hach Method 10258, Rev. 2.0.\51\ -------------------------------------------------------------------------------------------------------------------------------------------------------- [[Page 5789]] Alternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.74(a)(2) -------------------------------------------------------------------------------------------------------------------------------------------------------- SM 22nd edition,\28\ SM Residual Methodology EPA methods SM 21st edition 23rd edition,\49\ ASTM \4\ Other \1\ SM 24th edition \66\ -------------------------------------------------------------------------------------------------------------------------------------------------------- Free Chlorine................... Amperometric .................. 4500-Cl D......... 4500-Cl D......... D 1253-08, -14.... Titration. DPD Ferrous .................. 4500-Cl F......... 4500-Cl F......... Titrimetric. DPD Colorimetric.. .................. 4500-Cl G......... 4500-Cl G......... .................. Hach Method 10260.\31\ Indophenol .................. .................. .................. .................. Hach Method Colorimetric. 10241.\34\ Syringaldazine .................. 4500-Cl H......... 4500-Cl H......... (FACTS). On-line Chlorine EPA 334.0.\16\ Analyzer. Amperometric .................. .................. .................. .................. ChloroSense,\17\ Sensor. ChloroSense, Rev. 1.1.\59\ Total Chlorine.................. Amperometric .................. 4500-Cl D......... 4500-Cl D......... D 1253-08, -14.... Titration. Amperometric .................. 4500-Cl E......... 4500-Cl E......... Titration (Low level measurement). DPD Ferrous .................. 4500-Cl F......... 4500-Cl F......... Titrimetric. DPD Colorimetric.. .................. 4500-Cl G......... 4500-Cl G......... .................. Hach Method 10260.\31\ Indophenol 127.\55\ Colorimetric. Iodometric .................. 4500-Cl I......... 4500-Cl I......... Electrode. On-line Chlorine EPA 334.0.\16\ Analyzer. Amperometric .................. .................. .................. .................. ChloroSense,\17\ Sensor. ChloroSense, Rev. 1.1.\59\ Chlorine Dioxide................ Amperometric .................. 4500-ClO2 C....... 4500-ClO2 C....... Titration. Amperometric .................. 4500-ClO2 E....... 4500-ClO2 E....... Titration. Amperometric .................. .................. .................. .................. ChlordioX Sensor. Plus,\32\ ChlordioX Plus, Rev. 1.1.\60\ Ozone........................... Indigo Method..... .................. 4500-O3 B......... 4500-O3 B......... -------------------------------------------------------------------------------------------------------------------------------------------------------- Alternative Testing Methods for Contaminants Listed at 40 CFR 141.131(b)(1) -------------------------------------------------------------------------------------------------------------------------------------------------------- SM 22nd edition,\28\ SM SM 21st edition 23rd Contaminant Methodology EPA method ASTM \4\ SM online \3\ \1\ edition,\49\ SM Other 24th Edition \66\ -------------------------------------------------------------------------------------------------------------------------------------------------------- TTHM......................... P&T/GC/MS....... 524.3,\9\ 524.4.\29\ HAA5......................... LLE ................ ................ 6251 B-07....... 6251 B......... 6251 B......... (diazomethane)/ GC/ECD. Ion 557.\14\ Chromatography Electrospray Ionization Tandem Mass Spectrometry (IC-ESI-MS/MS). Two-Dimensional ................ ................ ................ ............... ............... Thermo Fisher Ion 557.1.\47\ Chromatography (IC) with Suppressed Conductivity Detection. Bromate...................... Two-Dimensional 302.0\18\ Ion Chromatography (IC). Ion 557.\14\ Chromatography Electrospray Ionization Tandem Mass Spectrometry (IC-ESI-MS/MS). [[Page 5790]] Chemically ................ D 6581-08 A..... Suppressed Ion Chromatography. Electrolytically ................ D 6581-08 B..... Suppressed Ion Chromatography. Chlorite..................... Chemically ................ D 6581-08 A..... Suppressed Ion Chromatography. Electrolytically ................ D 6581-08 B..... Suppressed Ion Chromatography. Chlorite--daily monitoring as Amperometric ................ ................ ................ 4500-ClO2 E.... 4500-ClO2 E.... prescribed in 40 CFR Titration. 141.132(b)(2)(i)(A). Amperometric ................ ................ ................ ............... ............... ChlordioX Sensor. Plus,\32\ ChlordioX Plus, Rev. 1.1.\60\ -------------------------------------------------------------------------------------------------------------------------------------------------------- Alternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.131(c)(1) -------------------------------------------------------------------------------------------------------------------------------------------------------- SM 22\nd\ edition,\28\ SM Residual Methodology SM 21\st\ edition \1\ 23\rd\ edition,\49\ ASTM \4\ Other SM 24\th\ edition \66\ -------------------------------------------------------------------------------------------------------------------------------------------------------- Free Chlorine...................... Amperometric Titration 4500-Cl D............. 4500-Cl D............ D 1253-08, -14....... DPD Ferrous 4500-Cl F............. 4500-Cl F............ Titrimetric. DPD Colorimetric...... 4500-Cl G............. 4500-Cl G............ ..................... Hach Method 10260.\31\ Indophenol ...................... ..................... ..................... Hach Method Colorimetric. 10241.\34\ Syringaldazine (FACTS) 4500-Cl H............. 4500-Cl H............ Amperometric Sensor... ...................... ..................... ..................... ChloroSense,\17\ ChloroSense, Rev. 1.1.\59\ On-line Chlorine ...................... ..................... ..................... EPA 334.0.\16\ Analyzer. Combined Chlorine.................. Amperometric Titration 4500-Cl D............. 4500-Cl D............ D 1253-08, -14....... DPD Ferrous 4500-Cl F............. 4500-Cl F............ Titrimetric. DPD Colorimetric...... 4500-Cl G............. 4500-Cl G............ ..................... Hach Method 10260.\31\ Total Chlorine..................... Amperometric Titration 4500-Cl D............. 4500-Cl D............ D 1253-08, -14....... >Low level 4500-Cl E............. 4500-Cl E............ Amperometric Titration. DPD Ferrous 4500-Cl F............. 4500-Cl F............ Titrimetric. DPD Colorimetric...... 4500-Cl G............. 4500-Cl G............ ..................... Hach Method 10260.\31\ Iodometric Electrode.. 4500-Cl I............. 4500-Cl I............ Amperometric Sensor... ...................... ..................... ..................... ChloroSense,\17\ ChloroSense, Rev. 1.1.\59\ On-line Chlorine ...................... ..................... ..................... EPA 334.0.\16\ Analyzer. Chlorine Dioxide................... Amperometric Method II 4500-ClO2 E........... 4500-ClO2 E.......... Amperometric Sensor... ...................... ..................... ..................... ChlordioX Plus,\32\ ChlordioX Plus, Rev. 1.1.\60\ -------------------------------------------------------------------------------------------------------------------------------------------------------- * * * * * Alternative Testing Methods for Parameters Listed at 40 CFR 141.131(d) -------------------------------------------------------------------------------------------------------------------------------------------------------- SM 23\rd\ SM 21\st\ SM 22\nd\ edition \49\, SM Parameter Methodology edition \1\ edition \28\ 24\th\ edition SM online \3\ EPA Other \66\ -------------------------------------------------------------------------------------------------------------------------------------------------------- Total Organic Carbon (TOC)... High Temperature 5310 B.......... 5310 B.......... 5310 B.......... ............... 415.3, Rev 1.2 Combustion. \19\. Persulfate- 5310 C.......... 5310 C.......... 5310 C.......... ............... 415.3, Rev 1.2 Hach Method Ultraviolet or \19\. 10267 \38\. Heated Persulfate Oxidation. Wet Oxidation... 5310 D.......... 5310 D.......... ................ ............... 415.3, Rev 1.2 \19\. Ozone Oxidation. ................ ................ ................ ............... ............... Hach Method 10261 \37\. Specific Ultraviolet Calculation ................ ................ ................ ............... 415.3, Rev 1.2 Absorbance (SUVA). using DOC and \19\. UV254 data. Dissolved Organic Carbon High Temperature 5310 B.......... 5310 B.......... 5310 B.......... ............... 415.3, Rev 1.2 (DOC). Combustion. \19\. [[Page 5791]] Persulfate- 5310 C.......... 5310 C.......... 5310 C.......... ............... 415.3, Rev 1.2 Ultraviolet or \19\. Heated Persulfate Oxidation. Wet Oxidation... 5310 D.......... 5310 D.......... ................ ............... 415.3, Rev 1.2 \19\. Ultraviolet absorption at 254 Spectrophotometr 5910 B.......... 5910 B.......... 5910 B.......... 5910 B-11...... 415.3, Rev 1.2 ............... nm (UV254). y. \19\. -------------------------------------------------------------------------------------------------------------------------------------------------------- * * * * * Alternative Testing Methods for Contaminants Listed at 40 CFR 141.402(c)(2) -------------------------------------------------------------------------------------------------------------------------------------------------------- SM 23\rd\ SM 20\th\ SM 21\st\ SM 22\nd\ edition \49\, Organism Methodology edition \6\ edition \1\ edition \28\ SM 24\th\ SM online \3\ Other edition \66\ -------------------------------------------------------------------------------------------------------------------------------------------------------- E. coli...................... Colilert........ ................ 9223 B.......... 9223 B.......... 9223 B......... 9223 B-97, B-04 Colisure........ ................ 9223 B.......... 9223 B.......... 9223 B......... 9223 B-97, B-04 Colilert-18..... 9223 B.......... 9223 B.......... 9223 B.......... 9223 B......... 9223 B-97, B-04 Readycult[supreg ................ ................ ................ ............... ............... Readycult[supre ]. g].\20\ Colitag......... ................ ................ ................ ............... ............... Modified ColitagTM \13\, Modified Colitag TM, Version 2.0.\61\ Chromocult[supre ................ ................ ................ ............... ............... Chromocult[supr g]. eg].\21\ EC-MUG.......... ................ ................ 9221 F.......... 9221 F......... 9221 F-06...... NA-MUG.......... ................ ................ ................ 9222 I......... mColiBlue24 Test ................ ................ ................ 9222 J......... Tecta EC/TC \33\ \43\. RAPID'E.coli 2 \56\. Enterococci.................. Multiple-Tube ................ ................ ................ 9230 B......... 9230 B-04...... Technique. Membrane Filter ................ ................ ................ 9230 C......... Techniques. Fluorogenic ................ ................ ................ 9230 D......... Substrate Enterococcus Test (using Enterolert). Coliphage.................... Two-Step ................ ................ ................ ............... ............... Fast Phage.\30\ Enrichment Presence- Absence Procedure. -------------------------------------------------------------------------------------------------------------------------------------------------------- * * * * * Alternative Testing Methods for Contaminants Listed at 40 CFR 141.852(a)(5) -------------------------------------------------------------------------------------------------------------------------------------------------------- SM 23\rd\ edition Organism Methodology Method SM 20\th\, 21\st\ SM 22\nd\ edition \49\, SM 24\th\ SM online \3\ category editions \1\ \6\ \28\ edition \66\ -------------------------------------------------------------------------------------------------------------------------------------------------------- Total Coliforms................. Lactose Standard Total .................. 9221 B.1, B.2..... 9221 B.1, B.2, 9221 B.1, B.2-06. Fermentation Coliform B.3, B.4. Methods. Fermentation Technique. Presence-Absence .................. .................. 9221 D.1, D.2, D.3 (P-A) Coliform Test. Membrane Standard Total .................. .................. 9222 B, C......... Filtration Coliform Membrane Methods. Filter Procedure using Endo Media. Simultaneous .................. .................. 9222 J............ Detection of Total Coliforms and E. coli by Dual Chromogen Membrane Filter Procedure (using mColiBlue24 medium). Simultaneous Detection of Total Coliform Bacteria and Escherichia coli Using RAPID'E.coli (REC2) in Drinking Water \56\. Enzyme Substrate Colilert[supreg].. .................. 9223 B............ 9223 B............ 9223 B-04. Methods. Colisure[supreg].. .................. 9223 B............ 9223 B............ 9223 B-04. Colilert-18....... 9223 B............ 9223 B............ 9223 B............ 9223 B-04. Tecta EC/TC \33\ \43\. [[Page 5792]] Modified ColitagTM, Version 2.0 \61\. Escherichia coli................ Escherichia coli EC-MUG medium..... .................. 9221 F.1.......... 9221 F.1.......... 9221 F.1-06. Procedure (following Lactose Fermentation Methods). Escherichia coli EC broth with MUG .................. .................. 9222 H............ Partitioning (EC-MUG). Methods (following Membrane Filtration Methods). NA-MUG medium..... .................. .................. 9222 I............ Simultaneous mColiBlue24 medium .................. .................. 9222 J............ Detection of Total Coliforms and E. coli by Dual Chromogen Membrane Filter Procedure. Membrane Simultaneous Filtration Method. Detection of Total Coliform Bacteria and Escherichia coli Using RAPID'E.coli (REC2) in Drinking Water \56\. Enzyme Substrate Colilert[supreg].. .................. 9223 B............ 9223 B............ 9223 B-04. Methods. Colisure[supreg].. .................. 9223 B............ 9223 B............ 9223 B-04. Colilert-18....... 9223 B............ 9223 B............ 9223 B............ 9223 B-04. Tecta EC/TC \33\ \43\. Modified ColitagTM, Version 2.0 \61\. -------------------------------------------------------------------------------------------------------------------------------------------------------- Alternative Testing Methods for Contaminants Listed at 40 CFR 143.4(b) -------------------------------------------------------------------------------------------------------------------------------------------------------- SM 22\nd\ edition,\28\ SM SM 21\st\ edition 23\rd\ Contaminant Methodology EPA method ASTM \4\ \1\ edition,\49\ SM SM online \3\ 24\th\ edition \66\ -------------------------------------------------------------------------------------------------------------------------------------------------------- Aluminum........................ Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Atomic Absorption; .................. .................. 3111 D............ 3111 D............ Direct. Atomic Absorption; .................. .................. 3113 B............ 3113 B............ 3113 B-04, B-10. Furnace. Inductively .................. .................. 3120 B............ 3120 B............ Coupled Plasma. Chloride........................ Silver Nitrate .................. D 512-04 B, 12 B.. 4500-Cl\-\B....... 4500-Cl\-\B....... Titration. Ion Chromatography .................. D 4327-11, -17.... 4110 B............ 4110 B............ Potentiometric .................. .................. 4500-Cl\-\D....... 4500-Cl\-\D....... Titration. Color........................... Visual Comparison. .................. .................. 2120 B............ 2120 B............ Foaming Agents.................. Methylene Blue .................. .................. 5540 C............ 5540 C............ Active Substances (MBAS). Iron............................ Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Atomic Absorption; .................. .................. 3111 B............ 3111 B............ Direct. Atomic Absorption; .................. .................. 3113 B............ 3113 B............ 3113 B-04, B-10 Furnace. Inductively .................. .................. 3120 B............ 3120 B............ Coupled Plasma. Manganese....................... Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Atomic Absorption; .................. .................. 3111 B............ 3111 B............ Direct. Atomic Absorption; .................. .................. 3113 B............ 3113 B............ 3113 B-04, B-10. Furnace. Inductively .................. .................. 3120 B............ 3120 B............ Coupled Plasma. [[Page 5793]] Odor............................ Threshold Odor .................. .................. 2150 B............ 2150 B............ Test. Silver.......................... Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Atomic Absorption; .................. .................. 3111 B............ 3111 B............ Direct. Atomic Absorption; .................. .................. 3113 B............ 3113 B............ 3113 B-04, B-10. Furnace. Inductively .................. .................. 3120 B............ 3120 B............ Coupled Plasma. Sulfate......................... Ion Chromatography .................. D 4327-11, -17.... 4110 B............ 4110 B............ Gravimetric with .................. .................. 4500-SO4 \2\\-\C.. 4500-SO4 \2\\-\C.. 4500-SO4 \2\\-\C- ignition of 97. residue. Gravimetric with .................. .................. 4500-SO4 \2\\-\D.. 4500-SO4 \2\\-\D.. 4500-SO4 \2\\-\D- drying of residue. 97. Turbidimetric .................. D 516-07, 11, 16.. 4500-SO4 \2\\-\E.. 4500-SO4 \2\\-\E.. 4500-SO4 \2\\-\E- method. 97. Automated .................. .................. 4500-SO4 \2\\-\F.. 4500-SO4 \2\\-\F.. 4500-SO4 \2\\-\F- methylthymol blue 97. method. Total Dissolved Solids.......... Total Dissolved .................. .................. 2540 C............ 2540 C............ Solids Dried at 180 deg C. Zinc............................ Axially viewed 200.5, Revision inductively 4.2 \2\. coupled plasma- atomic emission spectrometry (AVICP-AES). Atomic Absorption; .................. .................. 3111 B............ 3111 B............ Direct Aspiration. Inductively .................. .................. 3120 B............ 3120 B............ Coupled Plasma. -------------------------------------------------------------------------------------------------------------------------------------------------------- * * * * * * * \1\ Standard Methods for the Examination of Water and Wastewater, 21st edition (2005). Available from American Public Health Association, 800 I Street NW, Washington, DC 20001-3710. \2\ EPA Method 200.5, Revision 4.2. ``Determination of Trace Elements in Drinking Water by Axially Viewed Inductively Coupled Plasma-Atomic Emission Spectrometry.'' 2003. EPA/600/R-06/115. (Available at http://www.epa.gov/water-research/epa-drinking-water-research-methods.) \3\ Standard Methods Online are available at http://www.standardmethods.org. The year in which each method was approved by the Standard Methods Committee is designated by the last two digits in the method number. The methods listed are the only online versions that may be used. \4\ Available from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 or http://astm.org. The methods listed are the only alternative versions that may be used. * * * * * * * \6\ Standard Methods for the Examination of Water and Wastewater, 20th edition (1998). Available from American Public Health Association, 800 I Street NW, Washington, DC 20001-3710. \7\ Method ME355.01, Revision 1.0. ``Determination of Cyanide in Drinking Water by GC/MS Headspace,'' May 26, 2009. Available at https://www.nemi.gov or from James Eaton, H & E Testing Laboratory, 221 State Street, Augusta, ME 04333. (207) 287-2727. \8\ Systea Easy (1-Reagent). ``Systea Easy (1-Reagent) Nitrate Method,'' February 4, 2009. Available at https://www.nemi.gov or from Systea Scientific, LLC., 900 Jorie Blvd., Suite 35, Oak Brook, IL 60523. \9\ EPA Method 524.3, Version 1.0. ``Measurement of Purgeable Organic Compounds in Water by Capillary Column Gas Chromatography/Mass Spectrometry,'' June 2009. EPA 815-B-09-009. Available at https://www.nemi.gov. \10\ Mitchell Method M5271, Revision 1.1. ``Determination of Turbidity by Laser Nephelometry,'' March 5, 2009. Available at https://www.nemi.gov or from Leck Mitchell, Ph.D., PE, 656 Independence Valley Dr., Grand Junction, CO 81507. \11\ Mitchell Method M5331, Revision 1.1. ``Determination of Turbidity by LED Nephelometry,'' March 5, 2009. Available at https://www.nemi.gov or from Leck Mitchell, Ph.D., PE, 656 Independence Valley Dr., Grand Junction, CO 81507. \12\ Orion Method AQ4500, Revision 1.0. ``Determination of Turbidity by LED Nephelometry,'' May 8, 2009. Available at https://www.nemi.gov or from Thermo Scientific, 166 Cummings Center, Beverly, MA 01915, http://www.thermo.com. \13\ Modified ColitagTM Method. ``Modified ColitagTM Test Method for the Simultaneous Detection of E. coli and other Total Coliforms in Water (ATP D05- 0035),'' August 28, 2009. Available at https://www.nemi.gov or from CPI International, 5580 Skylane Boulevard, Santa Rosa, CA 95403. \14\ EPA Method 557. ``Determination of Haloacetic Acids, Bromate, and Dalapon in Drinking Water by Ion Chromatography Electrospray Ionization Tandem Mass Spectrometry (IC-ESI-MS/MS),'' September 2009. EPA 815-B-09-012. Available at https://www.nemi.gov. \15\ AMI Turbiwell, ``Continuous Measurement of Turbidity Using a SWAN AMI Turbiwell Turbidimeter,'' August 2009. Available at https://www.nemi.gov or from Markus Bernasconi, SWAN Analytische Instrumente AG, Studbachstrasse 13, CH-8340 Hinwil, Switzerland. \16\ EPA Method 334.0. ``Determination of Residual Chlorine in Drinking Water Using an On-line Chlorine Analyzer,'' September 2009. EPA 815-B-09-013. Available at https://www.nemi.gov. \17\ ChloroSense. ``Measurement of Free and Total Chlorine in Drinking Water by Palintest ChloroSense,'' August 2009. Available at https://www.nemi.gov or from Palintest Ltd, 1455 Jamike Avenue (Suite 100), Erlanger, KY 41018. \18\ EPA Method 302.0. ``Determination of Bromate in Drinking Water using Two-Dimensional Ion Chromatography with Suppressed Conductivity Detection,'' September 2009. EPA 815-B-09-014. Available at https://www.nemi.gov. \19\ EPA 415.3, Revision 1.2. ``Determination of Total Organic Carbon and Specific UV Absorbance at 254 nm in Source Water and Drinking Water,'' September 2009. EPA/600/R-09/122. Available at http://www.epa.gov/water-research/epa-drinking-water-research-methods. \20\ Readycult[supreg] Method, ``Readycult[supreg] Coliforms 100 Presence/Absence Test for Detection and Identification of Coliform Bacteria and Escherichia coli in Finished Waters,'' January, 2007. Version 1.1. Available from EMD Millipore (division of Merck KGaA, Darmstadt, Germany), 290 Concord Road, Billerica, MA 01821. \21\ Chromocult[supreg] Method, ``Chromocult[supreg] Coliform Agar Presence/Absence Membrane Filter Test Method for Detection and Identification of Coliform Bacteria and Escherichia coli in Finished Waters,'' November, 2000. Version 1.0. EMD Millipore (division of Merck KGaA, Darmstadt, Germany), 290 Concord Road, Billerica, MA 01821. \22\ Hach Company. ``Hach Company SPADNS 2 (Arsenite-Free) Fluoride Method 10225-Spectrophotometric Measurement of Fluoride in Water and Wastewater,'' January 2011. 5600 Lindbergh Drive, P.O. Box 389, Loveland, Colorado 80539. \23\ Hach Company. ``Hach Company TNTplus\TM\ 835/836 Nitrate Method 10206-Spectrophotometric Measurement of Nitrate in Water and Wastewater,'' January 2011. 5600 Lindbergh Drive, P.O. Box 389, Loveland, Colorado 80539. \24\ EPA Method 525.3. ``Determination of Semivolatile Organic Chemicals in Drinking Water by Solid Phase Extraction and Capillary Column Gas Chromatography/Mass Spectrometry (GC/MS),'' February 2012. EPA/600/R-12/010. Available at http://www.epa.gov/water-research/epa-drinking-water-research-methods. [[Page 5794]] \25\ EPA Method 536. ``Determination of Triazine Pesticides and their Degradates in Drinking Water by Liquid Chromatography Electrospray Ionization Tandem Mass Spectrometry (LC/ESI-MS/MS),'' October 2007. EPA 815-B-07-002. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. \26\ EPA Method 523. ``Determination of Triazine Pesticides and their Degradates in Drinking Water by Gas Chromatography/Mass Spectrometry (GC/MS),'' February 2011. EPA 815-R-11-002. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. * * * * * * * \28\ Standard Methods for the Examination of Water and Wastewater, 22nd edition (2012). Available from American Public Health Association, 800 I Street NW, Washington, DC 20001-3710. \29\ EPA Method 524.4, Version 1.0. ``Measurement of Purgeable Organic Compounds in Water by Gas Chromatography/Mass Spectrometry using Nitrogen Purge Gas.'' May 2013. EPA 815-R-13-002. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. \30\ Charm Sciences Inc. ``Fast Phage Test Procedure. Presence/Absence for Coliphage in Ground Water with Same Day Positive Prediction''. Version 009. November 2012. 659 Andover Street, Lawrence, MA 01843. Available at www.charmsciences.com. \31\ Hach Company. ``Hach Method 10260-Determination of Chlorinated Oxidants (Free and Total) in Water Using Disposable Planar Reagent-filled Cuvettes and Mesofluidic Channel Colorimetry,'' April 2013. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. \32\ ChlordioX Plus. ``Chlorine Dioxide and Chlorite in Drinking Water by Amperometry using Disposable Sensors,'' November 2013. Available from Palintest Ltd, 1455 Jamike Avenue (Suite 100), Erlanger, KY 41018. \33\ Tecta EC/TC. ``TechtaTM EC/TC Medium and TechtaTM Instrument: A Presence/Absence Method for the Simultaneous Detection of Total Coliforms and Escherichia coli (E. coli) in Drinking Water,'' version 1.0, May 2014. Available from Pathogen Detection Systems, Inc., 382 King Street East, Kingston, Ontario, Canada, K7K 2Y2. \34\ Hach Company. ``Hach Method 10241-Spectrophotometric Measurement of Free Chlorine (Cl2) in Drinking Water,'' November 2015. Revision 1.2. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. \35\ Hach Company. ``Hach Method 8026-Spectrophotometric Measurement of Copper in Finished Drinking Water,'' December 2015. Revision 1.2. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. \36\ Hach Company. ``Hach Method 10272-Spectrophotometric Measurement of Copper in Finished Drinking Water,'' December 2015. Revision 1.2. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. \37\ Hach Company. ``Hach Method 10261-Total Organic Carbon in Finished Drinking Water by Catalyzed Ozone Hydroxyl Radical Oxidation Infrared Analysis,'' December 2015. Revision 1.2. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. \38\ Hach Company. ``Hach Method 10267-Spectrophotometric Measurement of Total Organic Carbon (TOC) in Finished Drinking Water,'' December 2015. Revision 1.2. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. \39\ Hach Company. ``Hach Method 10258-Determination of Turbidity by 360[deg] Nephelometry,'' January 2016. Revision 1.0. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. \40\ Nitrate Elimination Company Inc. (NECi). ``Method for Nitrate Reductase Nitrate-Nitrogen Analysis of Drinking Water,'' February 2016. Superior Enzymes Inc., 334 Hecla Street, Lake Linden, Michigan 49945. \41\ Thermo Fisher. ``Thermo Fisher Scientific Drinking Water Orthophosphate Method for Thermo Scientific Gallery Discrete Analyzer,'' February 2016. Revision 5. Thermo Fisher Scientific, Ratastie 2, 01620 Vantaa, Finland. \42\ Mitchell Method M5331, Revision 1.2. ``Determination of Turbidity by LED or Laser Nephelometry,'' February 2016. Available from Leck Mitchell, Ph.D., PE, 656 Independence Valley Dr., Grand Junction, CO 81507. \43\ Tecta EC/TC. ``TectaTM EC/TC Medium and the TectaTM Instrument: A Presence/Absence Method for the Simultaneous Detection of Total Coliforms and Escherichia coli (E. coli) in Drinking Water,'' version 2.0, March 2017. Available from Pathogen Detection Systems, Inc., 382 King Street East, Kingston, Ontario, Canada, K7K 2Y2. \44\ Lovibond PTV 1000. ``Continuous Measurement of Drinking Water Turbidity using a Lovibond PTV 1000 White Light LED Turbidimeter,'' December 2016. Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. \45\ Lovibond PTV 2000. ``Continuous Measurement of Drinking Water Turbidity Using a Lovibond PTV 2000 660-nm LED Turbidimeter,'' December 2016. Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. \46\ Lovibond PTV 6000. ``Continuous Measurement of Drinking Water Turbidity Using a Lovibond PTV 6000 Laser Turbidimeter,'' December 2016. Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. \47\ Thermo Fisher. ``Thermo Fisher method 557.1: Determination of Haloacetic Acids in Drinking Water using Two-Dimensional Ion Chromatography with Suppressed Conductivity Detection,'' January 2017. Version 1.0. Available from Thermo Fisher Scientific, 490 Lakeside Dr., Sunnyvale, CA 94085 ([email protected]). \48\ EPA Method 150.3. ``Determination of pH in Drinking Water,'' February 2017. EPA 815-B-17-001. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. \49\ Standard Methods for the Examination of Water and Wastewater, 23rd edition (2017). Available from American Public Health Association, 800 I Street NW, Washington, DC 20001-3710. \50\ EPA Method 900.0, Rev. 1.0. ``Determination of Gross Alpha and Gross Beta in Drinking Water,'' February 2018. EPA 815-B-18-002. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. \51\ Hach Company. ``Hach Method 10258--Determination of Turbidity by 360[deg] Nephelometry.'' March 2018. Revision 2.0. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. \52\ Hach Company. ``Hach Method 8195-Determination of Turbidity by Nephelometry.'' March 2018. Revision 3.0. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. \53\ EPA Method 903.1, Rev. 1.0. ``Radium-226 in Drinking Water Radon Emanation Technique.'' January 2021. EPA 815-B-21-003. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. \54\ EPA Method 903.0, Rev. 1.0. ``Alpha-Emitting Radium Isotopes in Drinking Water.'' January 2021. EPA 815-B-21-002. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. \55\ EPA Method 127. ``Determination of Monochloramine Concentration in Drinking Water.'' January 2021. EPA 815-B-21-004. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. \56\ Bio-Rad. ``Simultaneous Detection of Total Coliform Bacteria and Escherichia coli using RAPID'E. coli 2 (REC2) in Drinking Water.'' May 2020. Bio- Rad Laboratories, 2000 Nobel Drive, Hercules, California 94547. \57\ Method 1001, Rev. 1.1. ``Lead in Drinking Water by Differential Pulse Anodic Stripping Voltammetry.'' May 2020. Palintest Ltd, 400 Corporate Circle, Suite J, Golden, CO 80401. \58\ ME 531, Version 1.0. ``Measurement of N-Methylcarbamoyloximes and N-Methylcarbamates in Drinking Water by LC-MS/MS. September 2019. Maine Health Environmental Testing Laboratory, 221 State Street, Augusta, ME 04330. \59\ ChloroSense, Rev. 1.1. ``Free and Total Chlorine in Drinking Water by Amperometry using Disposable Sensors.'' February 2020. Palintest Ltd, 400 Corporate Circle, Suite J, Golden, CO 80401. \60\ ChlordioX Plus, Rev. 1.1. ``Chlorine Dioxide and Chlorite in Drinking Water by Amperometry using Disposable Sensors.'' February 2020. Palintest Ltd, 400 Corporate Circle, Suite J, Golden, CO 80401. \61\ Modified ColitagTM, Version 2.0. ``Modified ColitagTM Test Method for the Simultaneous Determination of Total Coliforms and E. coli in Water.'' June 2020. Neogen Corporation, 620 Lesher Place, Lansing, MI 48912. \62\ EPA Method 904.0, Rev. 1.0. ``Radium-228 in Drinking Water.'' March 2022. EPA 815-B-22-003. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. \63\ Lovibond TB 6000. ``Measurement of Drinking Water Turbidity of a Captured Sample using a Lovibond Portable Laser Turbidimeter.'' May 2021. Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. \64\ Lovibond TB 3500. ``Measurement of Drinking Water Turbidity of a Captured Sample using a Lovibond White Light LED Portable Turbidimeter.'' May 2021. Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. \65\ Lovibond TB 5000. ``Measurement of Drinking Water Turbidity of a Captured Sample using a Lovibond 660-nm LED Portable Turbidimeter.'' May 2021. Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. \66\ Standard Methods for the Examination of Water and Wastewater, 24th edition (2023). Available from American Public Health Association, 800 I Street NW, Washington, DC 20001-3710. \67\ Hach Company. ``Hach Method 10312--Spectrophotometric Measurement of Fluoride in Finished Drinking Water Aluminum-Chromeazurol S complex (AL-CAS) Using Planar Reagent-filled Cuvettes''. August 2022. Revision 1.0. 5600 Lindbergh Drive, Loveland, Colorado 80539. \68\ Yokogawa Electric Corporation. ``Yokogawa Method 820--Measurement of Turbidity in Drinking Water by Right Angle Scattered Light Turbidity Analyzer''. November 2022. Revision 1.0. 2-9-32 Nakamachi, Musashino-shi, Tokyo, Japan 180-8750. [FR Doc. 2024-01530 Filed 1-29-24; 8:45 am] BILLING CODE 6560-50-P