[tbf]1 Excludes chemicals removed from the list, those added in 1990, 1991, 1994, and 1995,and aluminum oxide, ammonia, hydrochloric acid, and sulfuric acid.Chemicals covered for all reporting years.
2 The Environmental Protection Agency added 286 chemicals and chemical categories to the EPCRA section list of 313 list of toxic chemicals.EPCRA section list of 313 list of toxic chemicals.
3 POTW (Publicly Owned Treatment Work) is a wastewater treatment facility that is owned by a state or municipality.

Source: U.S. Environmental Protection Agency,1998 Toxic Release Inventory, EPA report 745-R-00-007.Note: The original document was changed by EPA on 11/9/2000. Those changes are not reflected here.

http://www.epa.gov/tri/

*The Toxics Release Inventory (TRI) site is designedto provide information on toxic chemical releases includingcollected data, guidance documents, program planning, background,history, and, program contacts, among other things. The dataincluded in this homepage have been submitted to U.S. EPA underthe Emergency Planning and Community Right- to-Know Act forchemicals and chemical categories listed by the Agency. Submitted data include chemical identity, amount of on-site uses,releases and off-site transfers (including publicly-ownedtreatment works), on-site treatment, and minimization/preventionactions.U.S. Environmental Protection Agency, Office ofPrevention, Pesticides, and Toxic Substances, Office of PollutionPrevention and Toxics, Environmental Assistance Division, ToxicsRelease Inventory Branch

*Releases. A release is an on-site discharge of a toxic chemical to the environment. This includes emissions tothe air, discharges to bodies of water, releases at the facility to land, as well as contained disposal intounderground injection wells. Releases are reported to TRI by media type.

Releases to Air. Releases to air are reported either as stack or fugitive emissions. Stack emissions arereleases to air that occur through confined air streams, such as stacks, vents, ducts, or pipes. Fugitive emissionsare all releases to air that are not released through a confined air stream. Fugitive emissions include equipmentleaks, evaporative losses from surface impoundments and spills, and releases from building ventilation systems.

Releases to Water. Releases to water include discharges to streams, rivers, lakes, oceans, and other bodies ofwater. This includes releases from contained sources, such as industrial process outflow pipes or open trenches.Releases due to runoff, including stormwater runoff, are also reportable to TRI.

Underground Injection. Underground injection is a contained release of a fluid into a subsurface well forthe purpose of waste disposal. Wastes containing TRI chemicals are injected into either Class I wells or Class Vwells. Class I wells are used to inject liquid hazardous wastes or dispose of industrial and municipal wastewatersbeneath the lowermost underground source of drinking water. Class V wells are generally used to inject non-hazardous fluid into or above an underground source of drinking water. TRI reporting does not currentlydistinguish between these two types of wells, although there are important differences in environmental impactbetween these two methods of injection. However, 1996 reports will provide this distinction.

Releases to Land. Releases to land occur within the boundaries of the reporting facility. Releases to landinclude disposal of toxic chemicals in landfills (in which wastes are buried), land treatment/application farming(in which a waste containing a listed chemical is applied to or incorporated into soil), surface impoundments(which are uncovered holding areas used to volatilize and/or settle waste materials), and other land disposalmethods (such as spills, leaks, or waste piles). For the 1996 reporting year, reporters will be requested todistinguish between RCRA subtitle C landfills and all other landfills.

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