For the first time, school districts statewide are being required to test their water supplies for lead under a new law that went into effect this year. It’s a huge endeavor that could mean further testing and expensive repairs if lead is discovered.

One district, Los Angeles Unified, has been addressing the problem since the late 1980s and is now taking calls from other districts seeking advice. Most recently, L.A. Unified launched a multimillion-dollar project to fix or shut down tainted water fountains. The district will finish the project in the fall.

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