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 This website is no longer updated and links to external websites and some internal pages may not work.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

RSEI Data Dictionary

This set of tables describes all of the data tables and fields used in EPA's Risk-Screening Environmental Indicators (RSEI) model and results data sets, and is also available in PDF format: RSEI Data Dictionary. Each table listed below comes with information about where it can be found (e.g., in EasyRSEI, or in the Geographic Microdata).

Note that many of these tables link to other tables using keys like FacilityNumber, ChemicalNumber, and ReleaseNumber. The key values change with each version of RSEI, so you must use the same version for all tables, including the Microdata. The only exceptions are the Census Crosswalks, Population data tables, and the Shapefiles, which do not change with each RSEI version (however, they do change occasionally, so you should use the most recent version of each). This version is v.2.3.9 (RY2019). For zip files containing the data tables for older versions, please see the RSEI ftp site.

Additional information can be found in the RSEI methodology document and in the Geographic Microdata documentation.

                            Tables in the RSEI Data Dictionary
  Facility NAICS Submissions Disaggregated Microdata Census Crosswalks
  EPA Program IDs (Reporters) Chemical Releases Aggregated Microdata Population Data
  Offsite MCL Elements Block Group Microdata Shapefiles
  EPA Program IDs (Off-sites) Media Category Water Microdata