http://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?TRI

This is an information search system that provides free access to a serie of files from EPA's Toxic Chemical Release Inventories (beginning with TRI87) containing data on the estimated quantities of chemicals released to the environment or transferred off-site for waste treatment, as well as information related to source reduction and recycling. The search may be realized by chemical/other name, CAS registry number or chemical name fragment, facilities (name, number, or parent company name), SIC code, facility location (state, state/city, state/county, zip code, or EPA region: 01-10), or releases (total environmental, total air, total water, total land or total underground injection).