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 This website is no longer updated and links to external websites and some internal pages may not work.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

Risk-Screening Environmental Indicators (RSEI) Model

Risk-Screening Environmental Indicators (RSEI) Technical Appendices Version 2.3.8

These six technical appendices accompany the RSEI Methodology Document for Version 2.3.8, December 2019, and provide additional information on the data and methods used in the model.

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