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 This website is no longer updated and links to external websites and some internal pages may not work.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

NPDES Permit for Wesco Operating, Inc. – Winkleman Dome Field in Wyoming

Under National Pollutant Discharge Elimination System permit number WY-0025232, Wesco Operating, Inc. is authorized to discharge from its Tensleep #1 (Winkleman Dome Field) wastewater treatment facility in Fremont County, Wyoming to an unnamed ephemeral tributary of Big Horn Draw, which is tributary to the Little Wind River.

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