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 This website is no longer updated and links to external websites and some internal pages may not work.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

Considering Traditional Ecological Knowledge (TEK) During the Cleanup Process

This memorandum provides direction to improve the decision-making process as it relates to site assessment, characterization, and cleanup activities, to ensure EPA's Office of Land and Emergency Management is considering TEK when tribes willingly provide this information to the EPA.

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