{"data":{"id":"us/40-cfr-appendix-a-to-subpart-c-of-part-141","jurisdiction":"us","citation":"40 CFR Appendix A to Subpart C of Part 141","heading":"Appendix A to Subpart C of Part 141—Alternative Testing Methods Approved for Analyses Under the Safe Drinking Water Act","body":"Only the editions stated in the following table are approved.\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.21(f)(3)\nOrganism Methodology SM 21st Edition 1 SM 22nd Edition 28 SM Online 3 Other\nTotal Coliforms Total Coliform Fermentation Technique 9221 A, B 9221 A, B 9221 A,B-06\nTotal Coliform Membrane Filter Technique 9222 A, B, C\nPresence-Absence (P-A) Coliform Test 9221 D\nONPG-MUG Test 9223 9223 B 9223 B-04\nColitag TM Modified Colitag TM 13\nTecta EC/TC 33\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.21(f)(5)\nOrganism Methodology SM 22nd Edition 28 SM Online 3\nFecal Coliforms Fecal Coliform Procedure 9221 E 9221 E-06\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.21(f)(6)\nOrganism Methodology SM 20th Edition 6 SM 21st Edition 1 SM 22nd Edition 28 SM Online 3 Other\nE.coli ONPG-MUG Test 9223 B 9223 B 9223 B 9223 B-97, B-04\nColitag TM Modified Colitag TM 13\nTecta EC/TC 33\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.23(k)(1)\nContaminant Methodology EPA method SM 21st edition 1 SM 22nd edition 28 SM 23rd edition,49 SM 24th edition 66 SM online 3 ASTM 4 Other\nAlkalinity Titrimetric 2320 B 2320 B 2320 B D1067-06 B, 11 B, 16 B\nAntimony Hydride—Atomic Absorption D 3697-07, -12, -17\nAtomic Absorption; Furnace 3113 B 3113 B 3113 B 3113 B-04, B-10\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nArsenic Atomic Absorption; Furnace 3113 B 3113 B 3113 B 3113 B-04, B-10 D 2972-08 C, -15 C\nHydride Atomic Absorption 3114 B 3114 B 3114 B 3114 B-09 D 2972-08 B, -15 B\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nBarium Inductively Coupled Plasma 3120 B 3120 B 3120 B\nAtomic Absorption; Direct 3111 D 3111 D 3111 D\nAtomic Absorption; Furnace 3113 B 3113 B 3113 B 3113 B-04, B-10\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nBeryllium Inductively Coupled Plasma 3120 B 3120 B 3120 B\nAtomic Absorption; Furnace 3113 B 3113 B 3113 B 3113 B-04, B-10 D 3645-08 B, -15 B\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nCadmium Atomic Absorption; Furnace 3113 B 3113 B 3113 B 3113 B-04, B-10\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nCalcium EDTA titrimetric 3500-Ca B 3500-Ca B 3500-Ca B D 511-09, -14 A\nAtomic Absorption; Direct Aspiration 3111 B 3111 B 3111 B D 511-09, -14 B\nInductively Coupled Plasma 3120 B 3120 B 3120 B\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nIon Chromatography D 6919-09, -17\nChromium Inductively Coupled Plasma 3120 B 3120 B 3120 B\nAtomic Absorption; Furnace 3113 B 3113 B 3113 B 3113 B-04, B-10\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nCopper Atomic Absorption; Furnace 3113 B 3113 B 3113 B 3113 B-04, B-10 D 1688-07, -12 C, 17 C\nAtomic Absorption; Direct Aspiration 3111 B 3111 B 3111 B D 1688-07, -12 A, 17 A\nInductively Coupled Plasma 3120 B 3120 B 3120 B\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nColorimetry Hach Method 8026,35 Hach Method 10272.36\nConductivity Conductance 2510 B 2510 B 2510 B D 1125-14 A\nCyanide Manual Distillation with MgCl2 followed by: 4500-CN− C 4500-CN− C 4500-CN− C 4500-CN− C-99 D 2036-06 A\nSpectrophotometric, Amenable 4500-CN− G 4500-CN− G 4500-CN− G D 2036-06 B\nSpectrophotometric Manual 4500-CN− E 4500-CN− E 4500-CN− E D2036-06 A\nSelective Electrode 4500-CN− F 4500-CN− F 4500-CN− F\nGas Chromatography/Mass Spectrometry Headspace ME355.01.7\nFluoride Ion Chromatography 4110 B 4110 B 4110 B D 4327-11, -17\nManual Distillation; Colorimetric SPADNS 4500-F− B, D 4500-F− B, D 4500-F− B, D\nManual Electrode 4500-F− C 4500-F− C 4500-F− C D 1179-04, 10 B, 16 B\nAutomated Alizarin 4500-F− E 4500-F− E 4500-F− E\nArsenite-Free Colorimetric SPADNS Hach SPADNS 2 Method 10225,22 Hach Method 10312.67\nLead Atomic Absorption; Furnace 3113 B 3113 B 3113 B 3113 B-04, B-10 D 3559-08 D, 15 D\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nDifferential Pulse Anodic Stripping Voltametry Method 1001, Rev. 1.1.57\nMagnesium Atomic Absorption 3111 B 3111 B 3111 B D 511-09, -14 B\nInductively Coupled Plasma 3120 B 3120 B 3120 B\nComplexation Titrimetric Methods 3500-Mg B 3500-Mg B 3500-Mg B D 511-09, -14 A\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nIon Chromatography D 6919-09, -17\nMercury Manual, Cold Vapor 3112 B 3112 B 3112 B 3112 B-09 D 3223-12, -17\nNickel Inductively Coupled Plasma 3120 B 3120 B 3120 B\nAtomic Absorption; Direct 3111 B 3111 B 3111 B\nAtomic Absorption; Furnace 3113 B 3113 B 3113 B 3113 B-04, B-10\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nNitrate Ion Chromatography 4110 B 4110 B 4110 B D 4327-11, -17\nAutomated Cadmium Reduction 4500-NO3 − F 4500-NO3 − F 4500-NO3 − F\nManual Cadmium Reduction 4500-NO3 − E 4500-NO3 − E 4500-NO3 − E\nIon Selective Electrode 4500-NO3 − D 4500-NO3 − D 4500-NO3 − D\nReduction/Colorimetric Systea Easy (1-Reagent),8 NECi Nitrate-Reductase.40\nColorimetric; Direct Hach TNTplusTM 835/836 Method 10206.23\nCapillary Ion Electrophoresis D 6508-15\nNitrite Ion Chromatography 4110 B 4110 B 4110 B D 4327-11, -17\nAutomated Cadmium Reduction 4500-NO3 − F 4500-NO3 − F 4500-NO3 − F\nManual Cadmium Reduction 4500-NO3 − E 4500-NO3 − E 4500-NO3 − E\nSpectrophotometric 4500-NO2 − B 4500-NO2 − B 4500-NO2 − B\nReduction/Colorimetric Systea Easy (1-Reagent),8 NECi Nitrate-Reductase.40\nCapillary Ion Electrophoresis D 6508-15\nOrtho-phosphate Ion Chromatography 4110 B 4110 B 4110 B D 4327-11, -17\nColorimetric, ascorbic acid, single reagent 4500-P E 4500-P E 4500-P E 4500-P E-99\nColorimetric, Automated, Ascorbic Acid 4500-P F 4500-P F 4500-P F 4500-P F-99 Thermo Fisher Discrete Analyzer.41\nCapillary Ion Electrophoresis D 6508-15\npH Electrometric 150.3 48 4500-H+ B 4500-H+ B 4500-H+ B D 1293-12, -18\nSelenium Hydride-Atomic Absorption 3114 B 3114 B 3114 B 3114 B-09 D 3859-08 A, -15 A\nAtomic Absorption; Furnace 3113 B 3113 B 3113 B 3113 B-04, B-10 D 3859-08 B, -15 B\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nSilica Colorimetric D859-05, 10, 16\nMolybdosilicate 4500-SiO2 C 4500-SiO2 C 4500-SiO2 C\nHeteropoly blue 4500-SiO2 D 4500-SiO2 D 4500-SiO2 D\nAutomated for Molybdate-reactive Silica 4500-SiO2 E 4500-SiO2 E 4500-SiO2 E\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nInductively Coupled Plasma 3120 B 3120 B 3120 B\nSodium Atomic Absorption; Direct Aspiration 3111 B 3111 B 3111 B\nAxially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nIon Chromatography D 6919-09, -17\nTemperature Thermometric 2550 2550 2550 2550-10\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.24(e)(1)\nContaminant Methodology EPA method SM 21st edition 1 SM 22nd edition,28 SM 23rd edition,49 SM 24th edition 66 SM online 3 ASTM 4 Other\nBenzene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\nCarbon tetrachloride Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\nChlorobenzene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\n1,2-Dichlorobenzene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\n1,4-Dichlorobenzene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\n1,2-Dichloroethane Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\ncis-Dichloroethylene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\ntrans-Dichloroethylene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\nDichloromethane Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\n1,2-Dichloropropane Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\nEthylbenzene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\nStyrene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4 29\nTetrachloroethylene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\n1,1,1-Trichloroethane Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\nTrichloroethylene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\nToluene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\n1,2,4-Trichlorobenzene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\n1,1-Dichloroethylene Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4 29\n1,1,2-Trichlorethane Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\nVinyl chloride Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\nXylenes (total) Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\n2,4-D Gas Chromatography/Electron Capture Detection (GC/ECD) 6640 B 6640 B 6640 B-01, B-06 D 5317-20\n2,4,5-TP (Silvex) Gas Chromatography/Electron Capture Detection (GC/ECD) 6640 B 6640 B 6640 B-01, B-06 D 5317-20\nAlachlor Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nAtrazine Liquid Chromatography Electrospray Ionization Tandem Mass Spectrometry (LC/ESI-MS/MS) 536.25\nSolid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3,24 523.26\nBenzo(a)pyrene Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nCarbofuran High-performance liquid chromatography (HPLC) with post-column derivatization and fluorescence detection 6610 B 6610 B 6610 B-04\nLiquid Chromatography/Mass Spectrometry ME 531.58\nChlordane Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nDalapon Ion Chromatography Electrospray Ionization Tandem Mass Spectrometry (IC-ESI-MS/MS) 557.14\nGas Chromatography/Electron Capture Detection (GC/ECD) 6640 B 6640 B 6640 B-01, B-06\nDi(2-ethylhexyl)adipate Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nDi(2-ethylhexyl)phthalate Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nDibromochloropropane (DBCP) Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3.9\nDinoseb Gas Chromatography/Electron Capture Detection (GC/ECD) 6640 B 6640 B 6640 B-01, B-06\nEndrin Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nEthyl dibromide (EDB) Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3.9\nGlyphosate High-Performance Liquid Chromatography (HPLC) with Post-Column Derivatization and Fluorescence Detection 6651 B 6651 B 6651 B-00, B-05\nHeptachlor Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nHeptachlor Epoxide Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nHexachlorobenzene Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nHexachlorocyclo-pentadiene Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nLindane Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nMethoxychlor Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nOxamyl High-performance liquid chromatography (HPLC) with post-column derivatization and fluorescence detection 6610 B 6610 B 6610 B-04\nLiquid Chromatography/Mass Spectrometry ME 531.58\nPCBs (as Aroclors) Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nPentachlorophenol Gas Chromatography/Electron Capture Detection (GC/ECD) 6640 B 6640 B 6640 B-01, B-06 D 5317-20\nSolid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nPicloram Gas Chromatography/Electron Capture Detection (GC/ECD) 6640 B 6640 B 6640 B-01, B-06 D 5317-20\nSimazine Liquid Chromatography Electrospray Ionization Tandem Mass Spectrometry (LC/ESI-MS/MS) 536.25\nSolid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3,24 523.26\nToxaphene Solid Phase Extraction/Gas Chromatography/Mass Spectrometry (GC/MS) 525.3.24\nTotal Trihalomethanes Purge \u0026Trap/Gas Chromatography/Mass Spectrometry 524.3,9 524.4.29\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.25(a)\nContaminant Methodology EPA method SM 21st edition 1 SM 22nd edition,28 SM 23rd edition,49 SM 24th edition 66 ASTM 4 SM online 3\nNaturally Occurring:\nGross alpha and beta Evaporation 900.0, Rev. 1.0 50 7110 B 7110 B\nLiquid Scintillation 7110 D D 7283-17 7110 D-17.\nGross alpha Coprecipitation 7110 C 7110 C\nRadium 226 Radon emanation 903.1, Rev. 1.0 53 7500-Ra C 7500-Ra C D 3454-05, -18, D 3454-21\nRadiochemical 903.0, Rev. 1.0 54 7500-Ra B 7500-Ra B D 2460-07\nGamma Spectrometry 7500-Ra E 7500-Ra E-07.\nRadium 228 Radiochemical 904.0, Rev. 1.0 62 7500-Ra D 7500-Ra D\nGamma Spectrometry 7500-Ra E 7500-Ra E-07.\nUranium Radiochemical 7500-U B 7500-U B\nICP-MS 3125 D 5673-05, 10, 16\nAlpha spectrometry 7500-U C 7500-U C D 3972-09\nLaser Phosphorimetry D 5174-07\nAlpha Liquid Scintillation Spectrometry D 6239-09\nMan-Made:\nRadioactive Cesium Radiochemical 7500-Cs B 7500-Cs B\nGamma Ray Spectrometry 7120 7120 D 3649-06\nRadioactive Iodine Radiochemical 7500-I B, 7500-I C, 7500-I D 7500-I B, 7500-I C, 7500-I D D 3649-06\nGamma Ray Spectrometry 7120 7120 D 4785-08, -20\nRadioactive Strontium 89, 90 Radiochemical 7500-Sr B 7500-Sr B\nTritium Liquid Scintillation 7500-3 H B 7500-3 H B D 4107-08, -20\nGamma Emitters Gamma Ray Spectrometry 7120, 7500-Cs B, 7500-I B 7120, 7500-Cs B, 7500-I B D 3649-06, D 4785-08, -20\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.74(a)(1)\nOrganism Methodology SM 21st edition 1 SM 22nd edition 28 SM 23rd edition 49 SM 24th edition 66 SM online 3 Other\nTotal Coliform Total Coliform Fermentation Technique 9221 A, B, C 9221 A, B, C 9221 A, B, C 9221 A, B, C 9221 A, B, C-06\nTotal Coliform Membrane Filter Technique 9222 A, B, C 9222 A, B, C 9222 A, B, C\nONPG-MUG Test 9223 9223 B 9223 B 9223 B 9223 B-04\nFecal Coliforms Fecal Coliform Procedure 9221 E 9221 E 9221 E 9221 E 9221 E-06\nFecal Coliform Filter Procedure 9222 D 9222 D 9222 D 9222 D 9222 D-06\nHeterotrophic bacteria Pour Plate Method 9215 B 9215 B 9215 B 9215 B-04\nTurbidity Nephelometric Method 2130 B 2130 B 2130 B 2130 B Hach Method 8195, Rev. 3.0.52\nLaser Nephelometry (on-line) Mitchell M5271,10 Mitchell M5331, Rev. 1.2,42 Lovibond PTV 6000.46\nLED Nephelometry (on-line) Mitchell M5331,11 Mitchell M5331, Rev. 1.2,42 Lovibond PTV 2000,45 Yokogawa 820.68\nLED Nephelometry (on-line) AMI Turbiwell,15 Lovibond PTV 1000.44\nLED Nephelometry (portable) Orion AQ4500,12 Lovibond TB 3500,64 Lovibond TB 5000.65\nLaser Nephelometry (portable) Lovibond TB 6000.63\n360° Nephelometry Hach Method 10258, Rev. 1.0,39 Hach Method 10258, Rev. 2.0.51\nAlternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.74(a)(2)\nResidual Methodology EPA methods SM 21st edition 1 SM 22nd edition,28 SM 23rd edition,49 SM 24th edition 66 ASTM 4 Other\nFree Chlorine Amperometric Titration 4500-Cl D 4500-Cl D D 1253-08, -14\nDPD Ferrous Titrimetric 4500-Cl F 4500-Cl F\nDPD Colorimetric 4500-Cl G 4500-Cl G Hach Method 10260.31\nIndophenol Colorimetric Hach Method 10241.34\nSyringaldazine (FACTS) 4500-Cl H 4500-Cl H\nOn-line Chlorine Analyzer EPA 334.0.16\nAmperometric Sensor ChloroSense,17 ChloroSense, Rev. 1.1.59\nTotal Chlorine Amperometric Titration 4500-Cl D 4500-Cl D D 1253-08, -14\nAmperometric Titration (Low level measurement) 4500-Cl E 4500-Cl E\nDPD Ferrous Titrimetric 4500-Cl F 4500-Cl F\nDPD Colorimetric 4500-Cl G 4500-Cl G Hach Method 10260.31\nIndophenol Colorimetric 127.55\nIodometric Electrode 4500-Cl I 4500-Cl I\nOn-line Chlorine Analyzer EPA 334.0.16\nAmperometric Sensor ChloroSense,17 ChloroSense, Rev. 1.1.59\nChlorine Dioxide Amperometric Titration 4500-ClO2 C 4500-ClO2 C\nAmperometric Titration 4500-ClO2 E 4500-ClO2 E\nAmperometric Sensor ChlordioX Plus,32 ChlordioX Plus, Rev. 1.1.60\nOzone Indigo Method 4500-O3 B 4500-O3 B\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.131(b)(1)\nContaminant Methodology EPA method ASTM 4 SM online 3 SM 21st edition 1 SM 22nd edition,28 SM 23rd edition,49 SM 24th Edition 66 Other\nTTHM P\u0026T/GC/MS 524.3,9 524.4.29\nHAA5 LLE (diazomethane)/GC/ECD 6251 B-07 6251 B 6251 B\nIon Chromatography Electrospray Ionization Tandem Mass Spectrometry (IC-ESI-MS/MS) 557.14\nTwo-Dimensional Ion Chromatography (IC) with Suppressed Conductivity Detection Thermo Fisher 557.1.47\nBromate Two-Dimensional Ion Chromatography (IC) 302.018\nIon Chromatography Electrospray Ionization Tandem Mass Spectrometry (IC-ESI-MS/MS) 557.14\nChemically Suppressed Ion Chromatography D 6581-08 A\nElectrolytically Suppressed Ion Chromatography D 6581-08 B\nChlorite Chemically Suppressed Ion Chromatography D 6581-08 A\nElectrolytically Suppressed Ion Chromatography D 6581-08 B\nChlorite—daily monitoring as prescribed in 40 CFR 141.132(b)(2)(i)(A) Amperometric Titration 4500-ClO2 E 4500-ClO2 E\nAmperometric Sensor ChlordioX Plus,32 ChlordioX Plus, Rev. 1.1.60\nAlternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.131(c)(1)\nResidual Methodology SM 21st edition 1 SM 22nd edition,28 SM 23rd edition,49 SM 24th edition 66 ASTM 4 Other\nFree Chlorine Amperometric Titration 4500-Cl D 4500-Cl D D 1253-08, -14\nDPD Ferrous Titrimetric 4500-Cl F 4500-Cl F\nDPD Colorimetric 4500-Cl G 4500-Cl G Hach Method 10260.31\nIndophenol Colorimetric Hach Method 10241.34\nSyringaldazine (FACTS) 4500-Cl H 4500-Cl H\nAmperometric Sensor ChloroSense,17 ChloroSense, Rev. 1.1.59\nOn-line Chlorine Analyzer EPA 334.0.16\nCombined Chlorine Amperometric Titration 4500-Cl D 4500-Cl D D 1253-08, -14.\nDPD Ferrous Titrimetric 4500-Cl F 4500-Cl F\nDPD Colorimetric 4500-Cl G 4500-Cl G Hach Method 10260.31\nTotal Chlorine Amperometric Titration 4500-Cl D 4500-Cl D D 1253-08, -14\nLow level Amperometric Titration 4500-Cl E 4500-Cl E\nDPD Ferrous Titrimetric 4500-Cl F 4500-Cl F\nDPD Colorimetric 4500-Cl G 4500-Cl G Hach Method 10260.31\nIodometric Electrode 4500-Cl I 4500-Cl I\nAmperometric Sensor ChloroSense,17 ChloroSense, Rev. 1.1.59\nOn-line Chlorine Analyzer EPA 334.0.16\nChlorine Dioxide Amperometric Method II 4500-ClO2 E 4500-ClO2 E\nAmperometric Sensor ChlordioX Plus,32 ChlordioX Plus, Rev. 1.1.60\nAlternative Testing Methods for Disinfectant Residuals Listed at 40 CFR 141.131(c)(2), If Approved by the State\nResidual Methodology Method\nFree Chlorine Test Strips Method D99-003 5\nAlternative Testing Methods for Parameters Listed at 40 CFR 141.131(d)\nParameter Methodology SM 21st edition 1 SM 22nd edition 28 SM 23rd edition 49, SM 24th edition 66 SM online 3 EPA Other\nTotal Organic Carbon (TOC) High Temperature Combustion 5310 B 5310 B 5310 B 415.3, Rev 1.2 19\nPersulfate-Ultraviolet or Heated Persulfate Oxidation 5310 C 5310 C 5310 C 415.3, Rev 1.2 19 Hach Method 10267 38.\nWet Oxidation 5310 D 5310 D 415.3, Rev 1.2 19\nOzone Oxidation Hach Method 10261 37.\nSpecific Ultraviolet Absorbance (SUVA) Calculation using DOC and UV254 data 415.3, Rev 1.2 19\nDissolved Organic Carbon (DOC) High Temperature Combustion 5310 B 5310 B 5310 B 415.3, Rev 1.2 19\nPersulfate-Ultraviolet or Heated Persulfate Oxidation 5310 C 5310 C 5310 C 415.3, Rev 1.2 19\nWet Oxidation 5310 D 5310 D 415.3, Rev 1.2 19\nUltraviolet absorption at 254 nm (UV254) Spectrophotometry 5910 B 5910 B 5910 B 5910 B-11 415.3, Rev 1.2 19\nAlternative Testing Methods With MRL ≤0.0010 mg/L for Monitoring Listed at 40 CFR 141.132(b)(3)(ii)(B)\nContaminant Methodology EPA method\nBromate Two-Dimensional Ion Chromatography (IC) 302.0 18\nIon Chromatography Electrospray Ionization Tandem Mass Spectrometry (IC-ESI-MS/MS) 557 14\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.402(c)(2)\nOrganism Methodology SM 20th edition 6 SM 21st edition 1 SM 22nd edition 28 SM 23rd edition 49, SM 24th edition 66 SM online 3 Other\nE. coli Colilert 9223 B 9223 B 9223 B 9223 B-97, B-04\nColisure 9223 B 9223 B 9223 B 9223 B-97, B-04\nColilert-18 9223 B 9223 B 9223 B 9223 B 9223 B-97, B-04\nReadycult® Readycult®.20\nColitag Modified ColitagTM 13, Modified Colitag TM, Version 2.0.61\nChromocult® Chromocult®.21\nEC-MUG 9221 F 9221 F 9221 F-06\nNA-MUG 9222 I\nmColiBlue24 Test 9222 J\nTecta EC/TC 33 43\nRAPID'E.coli 2 56\nEnterococci Multiple-Tube Technique 9230 B 9230 B-04\nMembrane Filter Techniques 9230 C\nFluorogenic Substrate Enterococcus Test (using Enterolert) 9230 D\nColiphage Two-Step Enrichment Presence-Absence Procedure Fast Phage.30\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.704(a)\nOrganism Methodology EPA Method\nCryptosporidium Filtration/Immunomagnetic Separation/Immunofluorescence Assay Microscopy 1623.1 27\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.704(b)\nOrganism Methodology SM 20th edition 6\nE. coli Membrane Filtration, Two Step 9222 D/9222 G\nAlternative Testing Methods for Contaminants Listed at 40 CFR 141.852(a)(5)\nOrganism Methodology category Method SM 20th, 21st editions 1 6 SM 22nd edition 28 SM 23rd edition 49, SM 24th edition 66 SM online 3\nTotal Coliforms Lactose Fermentation Methods Standard Total Coliform Fermentation Technique 9221 B.1, B.2 9221 B.1, B.2, B.3, B.4 9221 B.1, B.2-06.\nPresence-Absence (P-A) Coliform Test 9221 D.1, D.2, D.3\nMembrane Filtration Methods Standard Total Coliform Membrane Filter Procedure using Endo Media 9222 B, C\nSimultaneous Detection of Total Coliforms and E. coli by Dual Chromogen Membrane Filter Procedure (using mColiBlue24 medium) 9222 J\nSimultaneous Detection of Total Coliform Bacteria and Escherichia coli Using RAPID'E.coli (REC2) in Drinking Water 56\nEnzyme Substrate Methods Colilert® 9223 B 9223 B 9223 B-04.\nColisure® 9223 B 9223 B 9223 B-04.\nColilert-18 9223 B 9223 B 9223 B 9223 B-04.\nTecta EC/TC 33 43\nModified ColitagTM, Version 2.0 61\nEscherichia coli Escherichia coli Procedure (following Lactose Fermentation Methods) EC-MUG medium 9221 F.1 9221 F.1 9221 F.1-06.\nEscherichia coli Partitioning Methods (following Membrane Filtration Methods) EC broth with MUG (EC-MUG) 9222 H\nNA-MUG medium 9222 I\nSimultaneous Detection of Total Coliforms and E. coli by Dual Chromogen Membrane Filter Procedure mColiBlue24 medium 9222 J\nMembrane Filtration Method Simultaneous Detection of Total Coliform Bacteria and Escherichia coli Using RAPID'E.coli (REC2) in Drinking Water 56\nEnzyme Substrate Methods Colilert® 9223 B 9223 B 9223 B-04.\nColisure® 9223 B 9223 B 9223 B-04.\nColilert-18 9223 B 9223 B 9223 B 9223 B-04.\nTecta EC/TC 33 43\nModified ColitagTM, Version 2.0 61\nAlternative Testing Methods for Contaminants Listed at 40 CFR 143.4(b)\nContaminant Methodology EPA method ASTM 4 SM 21st edition 1 SM 22nd edition,28 SM 23rd edition,49 SM 24th edition 66 SM online 3\nAluminum Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nAtomic Absorption; Direct 3111 D 3111 D\nAtomic Absorption; Furnace 3113 B 3113 B 3113 B-04, B-10.\nInductively Coupled Plasma 3120 B 3120 B\nChloride Silver Nitrate Titration D 512-04 B, 12 B 4500-Cl− B 4500-Cl− B\nIon Chromatography D 4327-11, -17 4110 B 4110 B\nPotentiometric Titration 4500-Cl− D 4500-Cl− D\nColor Visual Comparison 2120 B 2120 B\nFoaming Agents Methylene Blue Active Substances (MBAS) 5540 C 5540 C\nIron Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nAtomic Absorption; Direct 3111 B 3111 B\nAtomic Absorption; Furnace 3113 B 3113 B 3113 B-04, B-10\nInductively Coupled Plasma 3120 B 3120 B\nManganese Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nAtomic Absorption; Direct 3111 B 3111 B\nAtomic Absorption; Furnace 3113 B 3113 B 3113 B-04, B-10.\nInductively Coupled Plasma 3120 B 3120 B\nOdor Threshold Odor Test 2150 B 2150 B\nSilver Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nAtomic Absorption; Direct 3111 B 3111 B\nAtomic Absorption; Furnace 3113 B 3113 B 3113 B-04, B-10.\nInductively Coupled Plasma 3120 B 3120 B\nSulfate Ion Chromatography D 4327-11, -17 4110 B 4110 B\nGravimetric with ignition of residue 4500-SO4 2 − C 4500-SO4 2 − C 4500-SO4 2 − C-97.\nGravimetric with drying of residue 4500-SO4 2 − D 4500-SO4 2 − D 4500-SO4 2 − D-97.\nTurbidimetric method D 516-07, 11, 16 4500-SO4 2 − E 4500-SO4 2 − E 4500-SO4 2 − E-97.\nAutomated methylthymol blue method 4500-SO4 2 − F 4500-SO4 2 − F 4500-SO4 2 − F-97.\nTotal Dissolved Solids Total Dissolved Solids Dried at 180 deg C 2540 C 2540 C\nZinc Axially viewed inductively coupled plasma-atomic emission spectrometry (AVICP-AES) 200.5, Revision 4.2 2\nAtomic Absorption; Direct Aspiration 3111 B 3111 B\nInductively Coupled Plasma 3120 B 3120 B\n1 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.\n2 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.)\n3 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.\n4 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.\n5 Method D99-003, Revision 3.0. “Free Chlorine Species (HOCl− and OCl−) by Test Strip,” November 21, 2003. Available from Industrial Test Systems, Inc., 1875 Langston St., Rock Hill, SC 29730.\n6 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.\n7 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 \u0026 E Testing Laboratory, 221 State Street, Augusta, ME 04333. (207) 287-2727.\n8 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.\n9 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.\n10 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.\n11 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.\n12 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.\n13 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.\n14 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.\n15 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.\n16 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.\n17 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.\n18 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.\n19 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.\n20 Readycult® Method, “Readycult® Coliforms 100 Presence/Absence Test for Detection and Identification of Coliform Bacteria and Escherichia coli in Finished Waters,” January, 2007. Version 1.1. Available from EMD Millipore (division of Merck KGaA, Darmstadt, Germany), 290 Concord Road, Billerica, MA 01821.\n21 Chromocult® Method, “Chromocult® Coliform Agar Presence/Absence Membrane Filter Test Method for Detection and Identification of Coliform Bacteria and Escherichia coli in Finished Waters,” November, 2000. Version 1.0. EMD Millipore (division of Merck KGaA, Darmstadt, Germany), 290 Concord Road, Billerica, MA 01821.\n22 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.\n23 Hach Company. “Hach Company TNTplusTM 835/836 Nitrate Method 10206-Spectrophotometric Measurement of Nitrate in Water and Wastewater,” January 2011. 5600 Lindbergh Drive, P.O. Box 389, Loveland, Colorado 80539.\n24 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.\n25 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.\n26 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.\n27 EPA Method 1623.1. “Cryptosporidium and Giardia in Water by Filtration/IMS/FA,” 2012. EPA-816-R-12-001. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep.\n28 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.\n29 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.\n30 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.\n31 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.\n32 ChlordioX Plus. “Chlorine Dioxide and Chlorite in Drinking Water by Amperometry using Disposable Sensors,” November 2013.\nAvailable from Palintest Ltd, 1455 Jamike Avenue (Suite 100), Erlanger, KY 41018.\n33 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.\n34 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.\n35 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.\n36 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.\n37 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.\n38 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.\n39 Hach Company. “Hach Method 10258-Determination of Turbidity by 360° Nephelometry,” January 2016. Revision 1.0. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539.\n40 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.\n41 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.\n42 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.\n43 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.\n44 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.\n45 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.\n46 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.\n47 Thermo Fisher. “Thermo Fisher method 557.1: Determination of Haloacetic Acids in Drinking Water using Two-Dimensional Ion Chromatography with Suppressed Conductivity Detection,” January 2017. Version 1.0. Available from Thermo Fisher Scientific, 490 Lakeside Dr., Sunnyvale, CA 94085 (Richard.jack@thermofisher.com).\n48 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.\n49 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.\n50 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.\n51 Hach Company. “Hach Method 10258—Determination of Turbidity by 360° Nephelometry.” March 2018. Revision 2.0. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539.\n52 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.\n53 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.\n54 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.\n55 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.\n56 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.\n57 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.\n58 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.\n59 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.\n60 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.\n61 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.\n62 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.\n63 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.\n64 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.\n65 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.\n66 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.\n67 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.\n68 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.\n69 e-sens, Inc. “e-sens, Inc. Automated Micro Chlorine Detection (AMCD) Method for the Determination of Residual Free and Total Chlorine in Water.” December 2023. Available from e-sens, Inc., 630 Komas Dr., Ste 235, Salt Lake City, Utah 84108.\n70 EPA Method 537.1, Version 1.0. “Determination of Selected Per- and Polyfluorinated Alkyl Substances (PFAS) in Drinking Water by Solid Phase Extraction and Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS).” November 2018. EPA/600/R-18/352. Approved as alternative testing method to support initial PFAS monitoring (for monitoring-frequency determinations) until April 26, 2027 as described at 40 CFR 141.902(b)(1) [Monitoring requirements for PFAS—Initial monitoring]. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER D—WATER PROGRAMS","PART 141—NATIONAL PRIMARY DRINKING WATER REGULATIONS","Subpart C—Monitoring and Analytical Requirements"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"2f81733fda298a62c8767ca04d4d1ff09ad5ddc449fe66fda74ffccd353e59de","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-141.29","next":"us/40-cfr-141.31"},"notice":"GroundRules: Original legal text. Not legal advice."}