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 This website is no longer updated and links to external websites and some internal pages may not work.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

Hazardous Waste

Documents Related to the Hazardous Waste Listing of Petroleum Refining Process Wastes

EPA listed four wastes as hazardous under the Resource Conservation and Recovery Act (RCRA) and decided not to list ten other petroleum refining wastes. The four wastes listed as hazardous are listed under K169, K170, K171 and K172. The environmentally sound recycling of oil-bearing residuals is promoted in this rule through the exclusion of certain recycled secondary materials.

An exemption for waste leachate from non-hazardous landfills containing the four listed wastes was promulgated pending further study of the issue. EPA has also responded to comments concerning spent catalyst waste from hydroprocessing reactors at petroleum refining facilities, information for which can be found below.

The final rule, as well as a fact sheet about the final rule can be found 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.