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 This website is no longer updated and links to external websites and some internal pages may not work.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

Environmental Modeling Community of Practice

303d Impaired Waters Additional Information

For ATTAINS 303(d) geospatial data, the Table of Available Cycles in the RAD lists the most recent ATTAINS cycle for which GIS data are available for each state. [Pending update to fact sheets: Users should now obtain state-level geospatial data at EPA's Environmental Dataset Gateway (EDG) Clip N Ship Site.]

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