Eleven schools in San Diego County had unsafe levels of lead in drinking water last year, according to new data from the California State Water Resources Control Board, and more test results are expected soon as schools adhere to new legislation. Gov. Jerry Brown in October signed a law that requires community water systems to test drinking water for lead in all public schools that serve kindergarten through 12th grade by July 2019. It took effect in January 2017. So far, more than 500 schools in the county have been tested.