Information requests under Clean Water Act (CWA) Section 308 are one of several important tools the EPA uses to obtain necessary and appropriate information to study discharges of pollutants and make regulatory decisions. EPA uses Section 308 letters as part of its effluent limitations guidelines development process and when implementing programs such as the National Pollutant Discharge Elimination System or Total Maximum Daily Loads. EPA's Office of Water issued a memorandum in 2018 clarifying its processes for collecting information from the regulated community under CWA Section 308.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
- Policy: Use of Clean Water Act Section 308 Letters (PDF)(6 pp, 2 MB, November 2018)