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An action level is not a health-based standard, but a standard that is used to indicate that a utility may need to install corrosion control treatment. The action level for lead is 0.015 mg/L or 15 ppb or less in 90% of the homes sampled. The action level for copper is 1.3 mg/L or 1300 ppb or less in 90% of the homes sampled.
