Do maximum contaminant levels (MCLs) apply to drinking water at a free-flowing tap?
EPA believes that Congress intended MCLs to apply to water at the tap; however, EPA has discretion to require monitoring at other locations as long as such monitoring is representative of levels at the tap. In addition, EPA concludes that Congress did not authorize EPA to hold public water systems liable for tap levels to the extent they are due to conditions in the distribution system that are outside the system's control (56 FR 26460, 26477; June 7, 1991).
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