With unnerving frequency, school districts and communities are discovering elevated lead levels after undertaking tests of drinking water sources in their facilities. Recently, comprehensive re-testing in New York City public school buildings found that 83% of buildings had at least one water source with lead levels about 15 parts per billion, the U.S. Environmental Protection Agency’s standard level for when action must be taken on public water systems. For drinking water, the recommended action level rises to 20 parts per billion.

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