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 This website is no longer updated and links to external websites and some internal pages may not work.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

Office of Inspector General

Notification: Gold King Mine Release

Project #OPE-FY15-0059, August 17, 2015.

The Office of Inspector General (OIG) for the U. S. Environmental Protection Agency (EPA) plans to begin preliminary research on the cause of, and the EPA’s response to, the August 5, 2015, release from the Gold King Mine in Colorado.

This is the 1st notification of this project, a 2nd notification is also available.

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