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Category Code Description Source Reference Low level method Active Alias Modified Date
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 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 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 07/15/2025
Analysis EPA504.1 1,2-Dibromoethane (EDB), 1,2-Dibromo-3-Chloro-Propane (DCBP), and 1,2,3-Trichloropropane (123TCP) in Water by Microextraction and Gas Chromatography USEPA U.S. EPA Office of Ground Water and Drinking Water/Technical Support Center, Methods for the Determination of Organic Compounds in Drinking Water - Supplement III (EPA/600/R-95-131), 1995 N Y 10/12/2023
Analysis EPA624.1 Purgables by Gas Chromatography/Mass Spectrometry (GC/MS), Revision 2016. USEPA U.S. Environmental Protection Agency, CWA Methods Team, EPA 821-R-16-008, 40CFR136A, December 2016. N Y 10/16/2023
Analysis EPA-3C-M Determination of Carbon Dioxide, Methane, Nitrogen, and Oxygen From Stationary Sources by GC with Thermal Conductivity Detector (TCD), Modified for Helium USEPA US EPA Air Programs, 40 CFR, Part 60, Appendix A-2, June 20, 1996 N Y 10/03/2023
Analysis EPA1638M Determination of Trace Elements in Ambient Waters by Inductively Coupled Plasma-Mass Spectrometry, Modified USEPA U.S. EPA Engineering and Analysis Division, Washington, DC, January 1996 N Y 10/04/2023
Analysis EPA365.5 Orthophosphate in Estuarine and Coastal Waters by Colorimetry (Automated) USEPA U.S. EPA National Exposure Research Laboratory (NERL), 1997, Methods for Determination of Chemical Substances in Marine and Estuarine Matrices - 2nd Edition (EPA/600/R-97/072), Revision 1.4 N Y 10/09/2023
Analysis EPA-TO-10A Determination of Pesticides and Polychlorinated Biphenyls in Ambient Air Using LOW Volume Polyurethane Foam (PUF) Sampling Followed by Gas Chromatographic/Multi-Detector Detection (GC/MD), Second Edition USEPA EPA, 1999. Compendium of Methods for the Determination of Toxic Organic Compounds in Ambient Air, Second Edition (EPA/625/R-96/010b). EPA Center for Environmental Research Information, Cincinnati, OH N Y 10/03/2023
Analysis EPA625M Base/Neutral and Acid Organics in Wastewater by GC/MS, Modified USEPA U.S.EPA National Exposure Research Laboratory (NERL), Cincinnati, Ohio, Methods and Guidance for Analysis of Water CD, Version 2.0 N Y 10/16/2023
Analysis EPA900.0 Gross Alpha and Gross Beta Radioactivity in Drinking Water by Alpha Gas Particle Counter, Version 1.0 USEPA US EPA, 1980. Prescribed Procedures for Measurement of Radioactivity in Drinking Water (EPA/600/4-80-032), August 1980. N Y 10/16/2023
Analysis EPA160.40-SM2540G Residue, Volatile, Muffle Furnace, Gravimetric, Ignition at 550 Deg-C and Total, Fixed and Volatile Solids in Solid and Semisolid Samples. USEPA U.S.EPA NERL, Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020) and Standard Methods for the Examination of Water and Wastewater, APHA-AWWA-WPCF N Y 10/04/2023
Analysis EPA1604 Total Coliform and E. coli in Water by Membrane Filtration using Simultaneous Detection USEPA U.S. Environmental Protection Agency Office of Water, EPA-821-R-02-024, September 2002. N Y 10/04/2023
Analysis EPA508 Chlorinated Pesticides in Water by Gas Chromatography with an Electron Capture Detector (GCECD) USEPA EPA, Methods for the Determination of Organic Compounds in Drinking Water - Supplement III (EPA/600/R-95-131), Revision 3.1, 1995 N Y 10/12/2023
Analysis EPA903.0 Alpha-Emitting Radium Isotopes in Drinking Water by Alpha Scintillation, Version 1.0 USEPA US EPA, 1980. Prescribed Procedures for Measurement of Radioactivity in Drinking Water (EPA/600/4-80-032), August 1980. N Y 10/16/2023
Analysis EPA1603 E. coli in Water by Membrane Filtration using Modified mTEC Agar USEPA U.S. Environmental Protection Agency Office of Water, EPA-821-R-02-023, September 2002 N Y 10/04/2023
Analysis EPA1699 Pesticides in water, soil, sediment, biosolids, and tissue by HRGC/HRMS USEPA U.S. Environmental Protection Agency, 2007, Method 1699: Pesticides in water, soil, sediment, biosolids, and tissue by HRGC/HRMS: USEPA, Washington, DC, EPA-821-R-08-001, 96 p. N Y 10/04/2023
Analysis EPA1657A Organo-Phosphorus Pesticides in Wastewater, Soil, Sludge, Sediment, and Tissue by GC/FPD, Revision A. USEPA U.S. Environmental Protection Agency (EPA) Office of Science and Technology, EPA-821-R-00-018, September 2000. N Y 08/12/2025
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 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 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 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 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 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 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 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 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 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 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 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 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 12/06/2018
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 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 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 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 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 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 12/06/2018
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