Magnesium Corp. of America: 57,691,060; chlorine; hydrochloric acid; 1-2-4 trimethylbenzene (Rowley, Tooele County)

Kennecott Utah Copper Smelter: 34,495,395; copper compounds; arsenic compounds; lead compounds (Magna)

Geneva Steel: 1,835,624; nitrate compounds; manganese compounds; zinc compounds (Vineyard, Utah County)

Western Zirconium: 1,783,000; nitrate compounds; ammonia; chlorine (Weber County)

Thiokol Propulsion: 1,012,229; hydrochloric acid; methyl tert-butyl ether; 1-1-1 trichloroethane (Promontory, Box Elder County)

Pacific States Cast Iron Pipe: 172,624; barium; phenol; manganese (Provo)

U.S. Air Force's Ogden Air Logistics Center: 172,402; methyl ethyl ketone; dichloromethane; phenol (Ogden)

Gossner Foods: 119,748; nitrate compounds (Cache County)

Becton Dickinson: 110,000; dichloro-fluoroethane (Sandy)

Alliant Aerospace-Bacchus Works: 97,709; hydrochloric acid; 1-1-1 trichloroethane; nitroglycerin (West Salt Lake County - Kearns, Magna, West Valley - up against the mountain)

Mining, power plant and waste dump sources:

Kennecott Utah Copper Mine: 405,388,216; copper compounds; manganese compounds; zinc compounds (Copperton)

Safety-Kleen: 15,148,128; manganese compounds; lead compounds; copper compounds (Grassy Mountain, Tooele County)

Barrick Resources-Mercur Gold Mine: 5,233,470; arsenic compounds; nitrate compounds; copper compounds (Tooele County)

Bonanza Power Plant: 1,910,370; barium; hydrochloric acid; vanadium (Unita County)

Intermountain Power Plant: 1,808,400; barium compounds; chromium compounds; manganese compounds (near Delta)

PacifiCorp Huntington Plant: 1,385,743; barium compounds; hydrogen fluoride; manganese compounds (Huntington, Emery County)

Envirocare of Utah: 1,364,359; lead; polychlorinated biphenyls; sodium dimethyldithiocarbamate (Clive, Tooele County)

Source: 1998 Toxic Release Inventory