An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

National Pollutant Discharge Elimination System (NPDES)

The Industrial User Permitting Guidance Manual

Provides guidance for control authorities to effectively develop and issue control mechanisms to IUs discharging to the POTW and covers developing and implementing control mechanisms for both SIUs and non-SIUs.

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