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 This website is no longer updated and links to external websites and some internal pages may not work.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

Assessing and Managing Chemicals under TSCA

Final Scope Documents for High-Priority Chemicals Undergoing Risk Evaluation

In December 2019, EPA designated 20 High-Priority substances to undergo risk evaluation under the Toxic Substances Control Act (TSCA). The final scope documents for these substances are available below. Also below is EPA's response to comments received on the draft scope documents, released in April 2020.  You can find additional information in the docket relevant to this action (EPA-HQ-OPPT-2019-0131) or in the individual dockets for each of the chemicals. View the final list of businesses subject to fees for these 20 risk evaluations.

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