Maximum Contaminant Level (SMCL).Secondary Standards are not enforced.They are guidelines for water treatment plant operators and state governments attempting to provide communities with the best quality water possible.Table 2 lists the current secondary drinking water standards. How Standards Are SetEPA regulators develop Primary Standards for drinking water contaminants based on three criteria:• The contaminant causes adverse health effects.• Risk assessment and cost-benefit considerations.• It is known to occur in drinking water.
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A 1946 study studied this question.