Adoption of a Regulation for the Hexavalent Chromium Maximum Contaminant Level

Adoption of a Regulation for the Hexavalent Chromium Maximum Contaminant Level

The State Water Board is proposing to adopt a primary drinking water standard for hexavalent chromium (Proposed Regulations) under the California Safe Drinking Water Act. The Proposed Regulations include a maximum contaminant level (MCL) for hexavalent chromium of 10 micrograms per liter (µg/L) and a detection limit for purposes of reporting of 0.1 micrograms per liter (µg/L). Public water systems, depending on type, would be required to monitor their drinking water for hexavalent chromium on an initial and ongoing basis. Public water systems would need to comply with the MCL according to a compliance schedule, and prepare Hexavalent Chromium MCL Compliance Plans, as required. The Proposed Regulations include three best available technologies for removing hexavalent chromium from drinking water sources, including reduction/coagulation/filtration, ion exchange, and reverse osmosis. Public water systems using new or modified treatment for hexavalent chromium would need to prepare Hexavalent Chromium Operations Plans. Public water systems are not limited to using best available technologies and may consider other means of compliance, such as blending, drilling a new well, increasing reliance on surface water, purchasing water from, or consolidating with another water system, or using another form of treatment such as stannous chloride. The Proposed Regulations also specify laboratory methods for analyzing hexavalent chromium in drinking water.

Statewide

California Air Resources Board (ARB), California Baldwin Hills Conservancy (BHC), California Coachella Valley Mountains Conservancy (CVMC), California Coastal Commission (CCC), California Department of Conservation (DOC), California Department of Corrections and Rehabilitation (CDCR), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Fish and Wildlife, Cannabis Program (CDFW), California Department of Fish and Wildlife, Central Region 4 (CDFW), California Department of Fish and Wildlife, Habitat Conservation Planning (CDFW), California Department of Fish and Wildlife, Inland Deserts Region 6 (CDFW), California Department of Fish and Wildlife, Marin Region 7 (CDFW), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Fish and Wildlife, Northern and Eureka Region 1 (CDFW), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Justice, Attorney General's Office, California Department of Parks and Recreation, California Department of Toxic Substances Control (DTSC), California Department of Transportation, District 1 (DOT), California Department of Transportation, District 10 (DOT), California Department of Transportation, District 11 (DOT), California Department of Transportation, District 12 (DOT), California Department of Transportation, District 2 (DOT), California Department of Transportation, District 3 (DOT), California Department of Transportation, District 4 (DOT), California Department of Transportation, District 5 (DOT), California Department of Transportation, District 6 (DOT), California Department of Transportation, District 7 (DOT), California Department of Transportation, District 8 (DOT), California Department of Transportation, District 9 (DOT), California Department of Transportation, Division of Aeronautics (DOT), California Department of Transportation, Division of Transportation Planning (DOT), California Department of Water Resources (DWR), California Energy Commission, California Fish and Game Commission (CDFGC), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Central Coast Region 3 (RWQCB), California Regional Water Quality Control Board, Central Valley Fresno Region 5 (RWQCB), California Regional Water Quality Control Board, Central Valley Redding Region 5 (RWQCB), California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB), California Regional Water Quality Control Board, Colorado River Basin Region 7 (RWQCB), California Regional Water Quality Control Board, Lahontan South Lake Tahoe Region 6 (RWQCB), California Regional Water Quality Control Board, Lahontan Victorville Region 6 (RWQCB), California Regional Water Quality Control Board, Los Angeles Region 4 (RWQCB), California Regional Water Quality Control Board, North Coast Region 1 (RWQCB), California Regional Water Quality Control Board, San Diego Region 9 (RWQCB), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California Regional Water Quality Control Board, Santa Ana Region 8 (RWQCB), California San Diego River Conservancy (SDRC), California San Joaquin River Conservancy (SJRC), California Santa Monica Mountains Conservancy (SMMC), California State Coastal Conservancy (SCC), California State Lands Commission (SLC), California Tahoe Conservancy, Central Valley Flood Protection Board, Colorado River Board, Delta Protection Commission, Delta Stewardship Council, Department of General Services (DGS), Office of Historic Preservation, San Francisco Bay Conservation and Development Commission (BCDC), San Gabriel and Lower Los Angeles Rivers and Mountains Conservancy (RMC), Santa Monica Bay Restoration, Sierra Nevada Conservancy, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Drinking Water, District 1, State Water Resources Control Board, Division of Drinking Water, District 10, State Water Resources Control Board, Division of Drinking Water, District 11, State Water Resources Control Board, Division of Drinking Water, District 12, State Water Resources Control Board, Division of Drinking Water, District 13, State Water Resources Control Board, Division of Drinking Water, District 14, State Water Resources Control Board, Division of Drinking Water, District 15, State Water Resources Control Board, Division of Drinking Water, District 16, State Water Resources Control Board, Division of Drinking Water, District 17, State Water Resources Control Board, Division of Drinking Water, District 18, State Water Resources Control Board, Division of Drinking Water, District 19, State Water Resources Control Board, Division of Drinking Water, District 2, State Water Resources Control Board, Division of Drinking Water, District 20, State Water Resources Control Board, Division of Drinking Water, District 21, State Water Resources Control Board, Division of Drinking Water, District 22, State Water Resources Control Board, Division of Drinking Water, District 23, State Water Resources Control Board, Division of Drinking Water, District 24, State Water Resources Control Board, Division of Drinking Water, District 25 (SWRCB), State Water Resources Control Board, Division of Drinking Water, District 26, State Water Resources Control Board, Division of Drinking Water, District 28, State Water Resources Control Board, Division of Drinking Water, District 3, State Water Resources Control Board, Division of Drinking Water, District 4, State Water Resources Control Board, Division of Drinking Water, District 5, State Water Resources Control Board, Division of Drinking Water, District 6, State Water Resources Control Board, Division of Drinking Water, District 7, State Water Resources Control Board, Division of Drinking Water, District 8, State Water Resources Control Board, Division of Drinking Water, District 9, State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance, Tahoe Regional Planning Agency (TRPA), University of California Natural Reserve System (UCNRS)

Other (Statewide Regulations)

Statewide regulation

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