Adoption of a Regulation for the Hexavalent Chromium Maximum Contaminant Level

Adoption of a Regulation for the Hexavalent Chromium Maximum Contaminant Level

The proposed Project consists of the State Water Board adopting and implementing a regulation that establishes the Maximum Contaminant Level (MCL) for hexavalent chromium (aka chromium-6) in drinking water provided by public water systems (PWS) in California. The State Water Board is considering 17 possible MCLs (1 to 15, 20, and 25 µg/L). The project scope includes not only setting the MCL for hexavalent chromium, but also the reasonably foreseeable methods of compliance. For hexavalent chromium, three treatment technologies are being identified as the Best Available Technology: Ion Exchange, Reduction-Coagulation/Filtration, and Reverse Osmosis. Public Water Systems, however, are not limited to treatment, and can consider other alternatives, if available. Such options could include the removal of contaminated source wells from use, blending of a contaminated source with an uncontaminated source to meet the MCL prior to distribution, drilling and constructing a new well in an uncontaminated aquifer, switching from contaminated groundwater to surface water, or consolidation with another water system that meets the MCL.

Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba

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 Fish and Wildlife, Habitat Conservation Planning (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of State Parks, Division of Boating and Waterways, California Department of Toxic Substances Control (DTSC), 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 Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), 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 Lands Commission (SLC), California Tahoe Conservancy, California Transportation Commission (CATC), Central Valley Flood Protection Board, Colorado River Board, Delta Protection Commission, Delta Stewardship Council, Department of Food and Agriculture (CDFA), 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 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), California Native American Heritage Commission (NAHC)

California Native American Heritage Commission (NAHC)

Other (Drinking Water Maximum Contaminant Level)

Water

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Coastal Zone, Cultural Resources, Cumulative Effects, Drainage/Absorption, Economics/Jobs, Energy, Fiscal Impacts, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Public Services, Schools/Universities, Septic System, Sewer Capacity, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire