An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Ground Water and Drinking Water

Pre-publication Federal Register Notice: Announcement of Final Regulatory Determinations for the Fourth Drinking Water Contaminant Candidate List

The EPA Administrator, Andrew Wheeler, signed the following rule on 1/15/2021, and EPA is submitting it for publication in the Federal Register (FR). While we have taken steps to ensure the accuracy of this Internet version of the rule, it is not the official version of the rule. Please refer to the official version in a forthcoming FR publication, which will appear on the Government Printing Office’s FDsys website (https://www.gpo.gov/fdsys/). It will also appear on Regulations.gov (https://www.regulations.gov/) in Docket No. EPA-HQ-OW-2019-0583. Once the official version of this document is published in the FR, this version will be removed from the Internet and replaced with a link to the official version.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.