Why are the lead action levels different for public water systems and schools?
The two lead action levels differ because of the different problems they seek to detect and the different monitoring protocols used in the two situations. The 20 ppb action level and sampling protocol for lead in schools is designed to pinpoint specific water fountains and outlets that require remediation (e.g., water cooler replacement). The 15 ppb action level and sampling protocol for public water systems is designed to identify system-wide problems and not problems in single outlets (56 FR 26460, 26479; June 7, 1991).
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