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 This website is no longer updated and links to external websites and some internal pages may not work.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 »

CWA Section 401 Certification

Clean Water Act Section 401 Guidance for Federal Agencies, States, and Authorized Tribes

The Clean Water Act Section 401 Certification Guidance for Federal Agencies, States, and Authorized Tribes (the 2019 Guidance) is no longer in effect.

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

Clean Water Act Section 401 Certification Guidance for Federal Agencies, States, and Authorized Tribes (PDF)(8 pp, 291 K, 06/07/2019)