Data / Federal rules / 2026-06662

Drinking Water Contaminant Candidate List 6-Draft

The Environmental Protection Agency published this proposed rule in the Federal Register on April 6, 2026. Comments closed on June 5, 2026.

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What the agency says

The U.S. Environmental Protection Agency (EPA) is publishing a draft list of contaminants that are currently not subject to any proposed or promulgated national primary drinking water regulations for public review and comment. These contaminants are known or anticipated to occur in public water systems and may require regulation under the Safe Drinking Water Act (SDWA) in the future. The draft list provided in this document is the sixth Contaminant Candidate List (CCL) published by the Agency since the SDWA amendments of 1996. The draft Sixth Contaminant Candidate List (CCL 6 or the list) includes 75 chemicals, 4 chemical groups (disinfection byproducts (DBPs), microplastics, per- and polyfluoroalkyl substances (PFAS), and pharmaceuticals) and 9 microbes. The EPA seeks public comment on the draft CCL 6 and the process used to develop the draft CCL 6. The EPA will consider all information and comments received in response to this notice of availability for determining the final CCL 6.

Key facts

Document number: 2026-06662
Type: Proposed rule
Action: Notice of availability; request for comments
Agency: Environmental Protection Agency
Published: April 6, 2026
Comments due: June 5, 2026
Dates: Comments must be received on or before June 5, 2026.
Docket: EPA-HQ-OW-2022-0946; FRL-10773-01-OW
Code of Federal Regulations: 40 CFR 141
Pages: 10

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Published in April 2026

Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.