Does the CCL impose any requirements on public water systems?
No. The CCL alone does not impose any requirements on public water systems. However, we may regulate contaminants on the list in the future. Before regulating a contaminant, EPA would 1) publish a preliminary determination to regulate; 2) issue a final determination; 3) publish a proposed regulation; and 4) issue a final regulation. Once a regulation is promulgated, public water systems typically have three years to come into compliance with a new regulation.
