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 This website is no longer updated and links to external websites and some internal pages may not work.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

Coal Combustion Residuals Impoundment Assessment Reports

As part of the U.S. Environmental Protection Agency's national effort to assess the management of coal combustion residuals (CCR or coal ash), EPA released the final contractor reports assessing the structural integrity of impoundments and similar management units containing CCR at coal fired power plants. A list of those reports and links to them can be found in the document below.

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