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 This website is no longer updated and links to external websites and some internal pages may not work.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


Get email

Risk-Screening Environmental Indicators (RSEI) Model

EPA's Risk-Screening Environmental Indicators (RSEI) model helps policy makers, researchers and communities explore data on releases of toxic substances from industrial facilities. RSEI incorporates information from the Toxics Release Inventory (TRI) on the amount of toxic chemicals released, together with factors such as the chemical’s fate and transport through the environment, each chemical’s relative toxicity, and potential human exposure. RSEI Scores can be used to help establish priorities for further investigation.