Regulations last checked for updates: Jan 31, 2025

Title 40 - Protection of Environment last revised: Nov 08, 2025
All TitlesTitle 40Chapter IPart 141Subpart QAppendix Appendix C - Appendix C to Subpart Q of Part 141—List of Acronyms Used in Public Notification Regulation
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Appendix Appendix C - Appendix C to Subpart Q of Part 141—List of Acronyms Used in Public Notification Regulation
CCR Consumer Confidence Report CWS Community Water System DBP Disinfection Byproduct EPA Environmental Protection Agency GWR Ground Water Rule HI Hazard Index HPC Heterotrophic Plate Count IESWTR Interim Enhanced Surface Water Treatment Rule IOC Inorganic Chemical LCR Lead and Copper Rule MCL Maximum Contaminant Level MCLG Maximum Contaminant Level Goal MRDL Maximum Residual Disinfectant Level MRDLG Maximum Residual Disinfectant Level Goal NCWS Non-Community Water System NPDWR National Primary Drinking Water Regulation NTNCWS Non-Transient Non-Community Water System NTU Nephelometric Turbidity Unit OGWDW Office of Ground Water and Drinking Water OW Office of Water PFAS Per- and Polyfluoroalkyl Substances PN Public Notification PWS Public Water System SDWA Safe Drinking Water Act SMCL Secondary Maximum Contaminant Level SOC Synthetic Organic Chemical SWTR Surface Water Treatment Rule TCR Total Coliform Rule TT Treatment Technique TWS Transient Non-Community Water System VOC Volatile Organic Chemical [65 FR 26035, May 4, 2000, as amended at 71 FR 65653, Nov. 8, 2006; 89 FR 32750, Apr. 26, 2024]
authority: 42 U.S.C. 300f,300g,300g,300g,300g,300g,300g,300j,300j,and
source: 40 FR 59570, Dec. 24, 1975, unless otherwise noted.
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