San Diego Unified found lead in water where it definitely should not be: coming from faucets with water filters on them. Last year, San Diego Unified found 38 schools with elevated levels of lead in their water. The district began replacing plumbing and fixtures and, in some cases, installing new water filters designed to remove lead. Lead is unsafe at any level and is especially damaging to children’s brains. Recently, though, the district has gotten results that show lead in newly filtered water. Samer Naji, a spokesman for the school district, said the results are a “head-scratcher.”