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 This website is no longer updated and links to external websites and some internal pages may not work.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

Proposed Rule – Updating Regulations on Water Quality Certification

On August 8, 2019, the EPA signed a proposed rule to implement Clean Water Act section 401. The proposed rule would replace and modernize the existing water quality certification regulations at 40 CFR Part 121. Additionally, the proposed rule would provide greater clarity and regulatory certainty for the water quality certification process, consistent with the April 2019 Presidential Executive Order entitled “Promoting Energy Infrastructure and Economic Growth.”

The proposed rule published in the Federal Register on August 22, 2019 and will be open for a 60-day public comment period which ends on October 21, 2019. Comments should be posted to Docket ID No. EPA-HQ-OW-2019-0405

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