Complete final lists of chemicals and all available data and monitoring results for the first three iterations of the US EPA’s Contaminate Candidate List (CCL) and Unregulated Contaminant Monitoring Rule (UCMR) are published online.

Monitoring data and other comprehensive information related to UCMR1, UCMR2, and UCMR3 can be viewed and downloaded on the U.S. EPA National Contaminant Occurrence Database.

Final published lists and comprehensive information for CCL1, CCL2, CCL3, and CCL4, can be found here, including details of regulatory determinations that have been made for chemicals included in CCL1, CCL2, and CCL3. This page also includes instructions for how to nominate a contaminant for the forthcoming CCL5. The nomination period ended in December 2018.

Check back soon for an interactive map of UCMR3 results within the Great Lakes basin.