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 This website is no longer updated and links to external websites and some internal pages may not work.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

TRI Model

TRI BannerTRI iconThis information is provided for technical experts who intend to work directly with the database. Other users can retrieve information using the TRI Search.

The TRI_FORM_R table is composed of columns from tables shown in the following the TRI model. The TRI_FORM_R table can be accessed through and is used by the TRI Customized Search, the TRI EZ Search, and the TRI Form R Search.

The TRI tables in Envirofacts are organized into the subject areas shown below. Click on a subject area to view the tables. 

TRI ModelReferences ModelReferences ModelSource Reduction and Recycling Activities ModelOnsite Treatment, Energy Recovery, and Recycling Methods ModelTransfer of Wastes to Off-Site Locations ModelReleases to Environmental Media ModelReported Chemical Information ModelFacilities Identification Model