Drinking Water Contaminant Candidate List (CCL) and Regulatory Determination
Contaminant Candidate List 5
EPA published the Fifth Contaminant Candidate List (CCL 5) that includes 66 chemicals, three chemical groups (per- and polyfluoroalkyl substances (PFAS), cyanotoxins, and disinfection byproducts (DBPs)), and 12 microbes. Read more.
Regulatory Determination 4
EPA announced final regulatory determinations for eight contaminants listed on the Fourth Contaminant Candidate List (CCL 4), including PFOA and PFOS. Read more.
EPA evaluates substances that may be in your drinking water by developing Contaminant Candidate Lists and periodically issuing a Regulatory Determination. Learn about the CCL and Regulatory Determination.