began regulating hexavalent chromium Drinking Water Chromium-6 webpage Additional Chromium-6 Information More Information from California Department of Public Health CDPH website California Cr6 regulations More Information from California Department of Public Health Chromium-6 Drinking Water MCL - DDW Drinking Water Chromium-6 webpage specifically for hexavalent chromium at 10 mcg/L State Water Resources Control Board of Drinking Water