Arsenic in California Drinking Water

More than three years after the federal government found California in noncompliance with the Safe Drinking Water Act, 95 public water systems serving more than 55,000 people across the state are still providing water with illegal levels of arsenic.  The highest arsenic levels in drinking water in California from 2011 through 2015 were in a group home for troubled teenage boys, the Valley Ranch in Madera County, according to state records.  Fifty-eight residential communities across the state exceeded the legal limit for arsenic during this period, as did 13 school districts, 12 mobile home parks, a military base, three wineries, two food preparation businesses and two campgrounds. Click here to download average arsenic concentrations for each water system.