Background Lead and Copper Rule (LCR) National Primary Drinking Water Regulation (NPDWR) promulgated June 7, 1991 –Addresses corrosion of lead and copper in drinking water primarily from service lines and household plumbing –Maximum Contaminant Level Goals (MCLG) Lead – 0 µg/L Copper – 1.3 mg/L –Requires a treatment technique (optimized corrosion control) rather than a Maximum Contaminant Level (MCL) –Tap sampling results are compared to an action level Lead - 15 µg/L Copper mg/L –Action level for lead is a screen for optimal corrosion control as part of the treatment technique.
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