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Category Code Description Source Reference Low level method Active Alias Modified By Modified Date
Analysis EPA522-V1.0 Determination of 1,4-Dioxane in Drinking Water by Solid Phase Extraction (SPE) and Gas Chromatography Mass Spectrometry (GC/MS) with Selected Ion Monitoring (SIM). Version 1.0 USEPA Munch, J. W. AND P. Grimmett. U.S. Environmental Protection Agency, Washington, DC, Version 1.0, September 2008, EPA/600/R-08/101. N Y benf461 10/16/2023
Analysis EPA552.3 Determination of Haloacetic Acids and Dalapon in Drinking Water by Liquid-liquid Microextraction, Derivatization, and Gas Chromatography with Electron Capture Detection USEPA US EPA, Methods for the Determination of Organic Compounds in Drinking Water -( EPA 815-B-03-002) Revision 1.0, July 2003 N Y benf461 10/10/2024
Analysis EPA537.1-V2.0 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), Version 2.0. USEPA Shoemaker, J. and Dan Tettenhorst. U.S. EPA, Office of Research and Development, National Center for Environmental Assessment, Washington, DC. EPA537.1, EPA/600/R-20/006, Version 2.0, March 2020. N Y CNEU461 10/14/2024
Analysis EPA1633 Analysis of Per- and Polyfluoroalkyl Substances (PFAS) in Aqueous, Solid, Biosolids, and Tissue Samples by LC-MS/MS, Revision 0 USEPA U.S. Environmental Protection Agency, Office of Water, Office of Science and Technology, Engineering and Analysis Division, EPA 821-R-24-001, January 2024, Revision 0. N Y CNEU461 04/30/2025
Analysis EPA200.8-SW7196A Chromium(III) by Calculation of Total Chromium by EPA200.8 (Metals and Trace Elements in Waters by ICP-MS) minus Chromium(VI) by SW7196A (Chromium, Hexavalent, Colorimetric, Revision 1) USEPA U.S.EPA - NERL, Methods for the Determination of Metals in Environmental Samples, Supplement 1 (EPA/600/R-94/111) and Office of Solid Waste SW-846, SW7196A Revision 1, July 1992. N Y CNEU461 12/18/2024
Preparation EPA1640-PREP Preparation by Reductive Precipitation in Metals and Trace Elements in Ambient Waters by On-Line Chelation and ICP-MS. USEPA EPA Methods and Guidance for Analysis of Water, Version 2.0, 1997. Engineering and Analysis Division. EPA Method Guidance CD-ROM. N Y CNEU461 01/23/2025
Analysis 1340-6010C Metals & Trace Elements by In Vitro Bioaccessibility Assay for Lead in Soil Prep (EPA SW1340, Revision 1) and Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES, EPA SW6010C, Revision 3). USEPA U.S. EPA Office of Solid Waste SW-846, Test Methods for Evaluating Solid Waste, Physical/Chemical Methods, SW1340 Revision 1, February 2017 and SW6010C Revision 3, February 2007. N Y CNEU461 02/13/2025
Analysis EPA533 Determination of Per- and Polyfluoroalkyl Substances (PFAS) in Drinking Water by Isotope Dilution Anion Exchange Solid Phase Extraction and Liquid Chromatography/Tandem Mass Spectrometry, Rev. 2019. USEPA USEPA, Office of Groundwater and Drinking Water/Office of Water, Tech Support Center, Cincinnati OH, No. 815-B-19-020, December 2019. N Y CNEU461 04/08/2025
Analysis EPA100.2 Determination of Asbestos Structures Over 10 um in Length in Drinking Water by Transmission Electron Microscopy. USEPA U.S.EPA National Exposure Research Lab (NERL), Microbiological and Chemical Exposure Assessment Research Div., Cincinnati OH, EPA/600R-94/134, June 1994. N Y CNEU461 07/14/2025
Analysis EPA1621 Determination of Adsorbable Organic Fluorine (AOF) in Aqueous Matrices by Combustion Ion Chromatography (CIC), Revision 0. USEPA U.S. EPA Office of Water (4303T), Office of Science and Technology, Engineering and Analysis Division, Revision 0, January 2024, EPA 821-R-24-002. N Y CNEU461 07/15/2025
Analysis EPA1621M Determination of Adsorbable Organic Fluorine (AOF) in Aqueous Matrices by Combustion Ion Chromatography (CIC), Revision 0, Modified Method. USEPA U.S. EPA Office of Water (4303T), Office of Science and Technology, Engineering and Analysis Division, Revision 0, January 2024, EPA 821-R-24-002. N Y CNEU461 07/15/2025
Analysis EPA1634Draft-M Determination of 6PPD-Quinone in Aqueous Matrices Using Liquid Chromatography with Tandem Mass Spectrometry (LC/MS/MS), Draft Version, Modified Method USEPA U.S. Environmental Protection Agency Office of Water (4303T), Office of Science and Technology Engineering and Analysis Division, EPA 821-D-24-001, Draft December 2023, Modified Method N Y CNEU461 02/03/2026
Analysis EPA1633A Analysis of Per- and Polyfluoroalkyl Substances (PFAS) in Aqueous, Solid, Biosolids, and Tissue Samples by LC-MS/MS, Revision 1 USEPA U.S. Environmental Protection Agency, Office of Water, Office of Science and Technology, Engineering and Analysis Division, EPA 821-R-24-001, December 2024, Revision 1. N Y CNEU461 02/12/2026
Analysis EPA420.4 Determination of Total Recoverable Phenolics by Semi-Automated Colorimetry, Revision 1.0 USEPA Edited by James W. O'Dell. U.S. Environmental Protection Agency, Environmental Monitoring Systems Laboratory, Office of Research and Development, Cincinnati, OH, August 1993, Revision 1.0 N Y CNEU461 02/12/2026
Analysis EPA904.0 Radium-228 in Drinking Water, Revision 1.0 USEPA U.S. EPA, Office of Ground Water and Drinking Water, Standards and Risk Management Division, Technical Support Center, Cincinnati, OH, EPA 815-B-22-003, Revision 1.0, March 2022 N Y CNEU461 02/25/2026
Measurement GWLMF Groundwater level by float / shaft encoder / data logger USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLML Groundwater level interpreted from geophysical logs USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMB Groundwater level by analog (mechanical) recorder USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMH Groundwater level by calibrated mechanical pressure-gage measurement USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMZ Groundwater level by other method USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMR Groundwater level reported, method not known USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLME Groundwater level, estimated USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMG Groundwater level by mechanical pressure-gage measurement USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMQ Groundwater level by downhole mechanical pressure recorder (DST) USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMC Groundwater level by calibrated airline measurement USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMS Groundwater level by steel tape measurement. USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMD Groundwater level by float / digital punch tape USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMN Groundwater level by nonrecording gage USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement USGS-FLOW Streamflow reported by USGS from gaging station, using standard USGS procedures. USGS Wahl, K.L. et al., 1995. Stream-Gaging Program of the U.S. Geological Survey. USGS Circular 1123. http://water.usgs.gov/pubs/circ/circ1123/ Y CNEU461 12/09/2004
Measurement GWLMA Groundwater level by airline measurement USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMM Groundwater level by manometer measurement USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMV Groundwater level by calibrated electric tape measurement USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMP Groundwater level by pressure transducer USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
Measurement GWLMT Groundwater level by electric tape measurement. USGS USGS, 1992. National Water Information System User's Manual, Ground-Water Site-Inventory System. http://waterdata.usgs.gov/nwis/ Y KKIN461 12/06/2018
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