On June 1, 2020, the EPA finalized the “Clean Water Act Section 401 Certification Rule” to implement the water quality certification process consistent with the text and structure of the CWA.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Economic Analysis for the Clean Water Act Section 401 Certification Rule (PDF)(40 pp, 856 K, May 2020)