My state has a maximum contaminant level (MCL) of 0.0005 mg/L for chlordane in drinking water, but the federal standard is 0.002 mg/L. Why does the state have a different standard?
States that are authorized to implement their own water program may use the National Primary Drinking Water Regulations or their own regulations, provided that they are no less stringent than federal standards (SDWA 1413(a)(1)).
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