States with primary enforcement responsibility (primacy states) are required to adopt drinking water regulations no less stringent than the national primary drinking water regulations set by EPA (SDWA 1413(a)(1)). Are primacy states also required to adopt
States are not required to adopt secondary drinking water regulations no less stringent than the federal regulations. States may establish higher or lower levels as appropriate to their particular circumstances and local conditions such as unavailability of alternate raw water sources or other compelling factors, provided that the levels adequately protect public health and welfare (44 FR 42195; July 17, 1979).
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