What Is the Toxic Release Inventory (TRI)? A Plain-English Guide
The Toxic Release Inventory (TRI) is a publicly available database of toxic chemical releases from industrial and federal facilities in the United States. Established under the Emergency Planning and Community Right-to-Know Act (EPCRA) in 1986, it was created largely in response to the 1984 Bhopal disaster and public demand for information about what chemicals were being used and released by facilities in local communities. Decades later, it remains one of the most significant environmental transparency tools in the world.
Who Has to Report
TRI reporting requirements apply to facilities in specific industry sectors (manufacturing, mining, utilities, chemicals, and others) that employ 10 or more full-time employees and that manufacture, process, or otherwise use any of the listed toxic chemicals above threshold quantities. The current TRI list includes roughly 800 chemicals and chemical categories, ranging from common industrial solvents to heavy metals to pesticides to PFAS compounds.
What Gets Reported
For each chemical above the reporting threshold, facilities must submit a Form R (or simplified Form A for lower-quantity reporters) detailing: releases to air, water, and land; off-site transfers to waste management facilities; and quantities managed through recycling, energy recovery, and treatment. This creates a detailed picture of how each facility handles each chemical — not just what escapes into the environment, but also what\'s recovered or destroyed on-site.
What TRI Doesn\'t Capture
Understanding TRI\'s limitations is as important as knowing what it covers. TRI only captures facilities above reporting thresholds — small manufacturers that use toxic chemicals below threshold quantities are not required to report. It also doesn\'t capture accidental releases that fall under CERCLA or emergency response reporting, and it doesn\'t cover most agriculture-related chemical use. TRI quantities are self-reported estimates, not direct measurements. Explore reported releases by chemical at the chemical index or find top emitters in your state at our state browser.
How EmissionsLookup Uses TRI Data
EmissionsLookup loads TRI Basic Plus data for multiple reporting years, linking it to the facility records from EPA ECHO. For each facility, you can see total releases in pounds, which chemicals are being released, and how releases have changed over time. The top emitters list shows the facilities with the highest total TRI releases, which is a useful starting point for community environmental impact research. For context on the communities near these facilities, CensusDepth provides neighborhood demographic data from the Census.