Superfund Site Profile
The 800-acre Monsanto Chemical Co. (Soda Springs Plant) site is located outside the city limits of Soda Springs, Idaho. The site includes the 540-acre Monsanto plant operating area and a 260-acre buffer area.
Monsanto purchased the property in 1952 to use local phosphate-rich ore to manufacture elemental phosphorus. Site activities and waste disposal practices contaminated soil and groundwater with hazardous chemicals and radioactive constituents. Following cleanup, operation and maintenance activities and monitoring are ongoing.