Frequent Questions

EPA has set standards (maximum contaminant levels and treatment techniques) for approximately 90 contaminants. What guidelines does EPA follow to determine if a particular contaminant should be regulated?

The Safe Drinking Water Act requires EPA to consider three evaluation criteria when determining whether or not to regulate a substance: potential adverse health affects from the contaminant, occurrence of the contaminant in public water systems including the frequency it is present at levels of public health concern, and whether regulation of the contaminant would present a meaningful opportunity for health risk reduction for persons served by public water systems (SDWA 1412(b)(1)(A)).
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