Draft Contaminant Candidate List 6 - CCL 6
EPA is beginning the development of the Sixth Contaminant Candidate List (CCL 6). The CCL is a list of contaminants that are currently not subject to any proposed or promulgated national primary drinking water regulations but are known or anticipated to occur in public water systems. Contaminants listed on the CCL may require future regulation under the Safe Drinking Water Act (SDWA).
On February 17, 2023, EPA requested nominations of chemicals, microbes, or other substances for consideration on the draft CCL 6. The public was able to nominate contaminants by following the instructions contained in the Federal Register notice for CCL 6 nominations. The deadline for submitting nominations was April 18, 2023 and is now closed. EPA will be evaluating the nominations and other contaminant data and information to consider inclusion on the draft CCL 6 for public review and comment.