What is the purpose of the U.S. Environmental Protection Agency’s Contaminant Candidate List?
The Contaminant Candidate List (CCL), published by the U.S. Environmental Protection Agency (USEPA), is a list of unregulated contaminants that are known or anticipated to occur in public water systems and may require regulation with a national primary drinking-water standard. This list is USEPA’s primary source of priority contaminants for the Agency’s drinking-water program. The Unregulated Contaminant Monitoring (UCM) Program is the mechanism used to collect occurrence data for unregulated contaminants suspected to occur in drinking water. (More information on this topic is included in Circular 1292 in sidebar 21).
