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Today, a long-awaited draft maximum contaminant level (MCL) for Chromium-6 was proposed by the California Department of Public Health at 10 (ten) parts per billion (ppb).
Chromium-6 is a groundwater constituent found in over 30% of groundwater basins in California, including Riverside County’s Coachella Valley and various basins in Los Angeles, San Bernardino, Solano, Santa Barbara, San Mateo, Santa Cruz and Yolo Counties. For example, affected cities include Glendale, Burbank, North Hollywood, Pomona, Monterey, Chino, Joshua Basin, Phelan, Twentynine Palms, Solano, Daly City, Santa Ynez, Soquel Creek, Davis, Woodland, and parts of San Francisco. It also naturally occurs in the Cadiz Valley aquifer system at levels consistent with the proposed MCL.