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What is the Toxics Release Inventory (TRI)?

The Toxics Release Inventory (TRI) is a publicly available database that contains information on toxic chemical releases and other waste management activities reported annually by certain covered industry groups as well as federal facilities. This inventory was established under a federal law called the Emergency Planning and Community Right to Know Act of 1986 (EPCRA) ( and was expanded by the Pollution Prevention Act of 1990 ( It requires facilities in certain industries which manufacture, process, or use significant amounts of toxic chemicals, to report annually on their releases of these chemicals. The reports contain information about the types and amounts of toxic chemicals that are released each year to the air, water, land and by underground injection, as well as information on the quantities of toxic chemicals sent to other facilities for further waste management.

Facilities with ten or more full-time employees that process more than 25,000 pounds in aggregate, or use greater than 10,000 pounds of any one TRI chemical, are required to report releases annually. The US Environmental Protection Agency (EPA) ( maintains this information in the Toxics Release Inventory (TRI) ( The toxics release files on the National Library of Medicine's® (NLM) Toxicology Data Network (TOXNET®) ( come from TRI.

TOXMAP uses the most current, final TRI data available from the EPA. Data submission deadlines, data entry processes, and data quality control and review all influence the actual date of data release by both the EPA and by TOXMAP.

A complete list of the TRI chemicals currently listed in TOXMAP can be found at A complete list of TRI chemicals required to be reported to the EPA can be found at

NOTE: At this time, TOXMAP uses reported on-site releases only. Some TRI chemicals have no reported releases, and so will not appear in the TRI release data or in TOXMAP. All release amounts are reported in pounds except dioxin which is reported in grams.

For more information, see the TRI Fact Sheet (