Over the last decade, the drinking water at thousands of schools across the country has been found to contain unsafe levels of lead, pesticides and dozens of other toxins.
An Associated Press investigation finds that contaminants have surfaced at public and private schools in all 50 states. The contamination is most apparent at schools with wells. The problem has gone largely unmonitored by the federal government.
Experts and children's advocates complain that responsibility for drinking water is spread among too many local, state and federal agencies, and that risks are going unreported.
Schools with unsafe water represent only a small percentage of the nation's more than 132,000 schools. And the EPA says the number of violations has spiked largely because the government has gradually adopted stricter standards for contaminants.