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 This website is no longer updated and links to external websites and some internal pages may not work.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

Polluted Runoff: Nonpoint Source (NPS) Pollution

Tribal 319: 2010 NPS Workshop

This tribal training was offered during the first day of the National Water Quality Monitoring Council conference held in Denver, Colorado.  The session covered CWA Section 106 and 319 topics, and featured three tribal case studies.

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