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Drinking Water Contaminant Candidate List (CCL) and Regulatory Determination

  • Contaminant Candidate List 5

    November 14, 2022 - 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

    January 19, 2021 - 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.

About the Drinking Water CCL

Drinking Water Reservior
The Contaminant Candidate List (CCL) is a list of drinking water contaminants that are known or anticipated to occur in public water systems and are not currently subject to EPA drinking water regulations.

Current and Previous CCLs

Lists
Read about each cycle of CCL.

Regulatory Determination

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The Safe Drinking Water Act requires EPA to periodically decide whether or not to regulate at least five contaminants on the Contaminant Candidate List. This action is called Regulatory Determination.
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Last updated on December 1, 2022