Superfund Site Profile

Community Open House

The U.S. Environmental Protection Agency invites your participation at a Community Open House. This will be a chance to talk one-on-one with experts, ask questions, and learn about on-going work. Representatives will be at the open house to answer questions, share information, provide materials, give updates, and discuss community concerns.

What: Community Open House, Former Tronox/Kerr McGee Facility and Monsanto Phosphorus Production Plant
When: Thursday, June 29, 2017 4:00 p.m. to 7:00 p.m. Drop in any time between 4 p.m. and 7 p.m.
Where: Soda Springs City Council Room, Soda Springs City Hall, 9 West 2nd South, Soda Springs, Idaho, 83276
Hosts: U.S. Environmental Protection Agency, Idaho Department of Environmental Quality, Multistate Environmental Response Trust, Monsanto Company
* Light refreshments courtesy of the Multistate Environmental Response Trust


  • Area Well sampling
  • Update on recent groundwater and surface water investigations
  • Concerns about drinking water
  • Concerns about irrigation

Kerr-McGee Site:

  • Molybdenum in area groundwater
  • Vanadium in area groundwater
  • Status of cleanup activities
  • 2015-2016 Waste Removal Project
  • Site reuse and redevelopment initiatives

Monsanto Site:

  • Selenium in area groundwater
  • Selenium Capture and Treatment
  • Status of cleanup activities
  • Site safety




EPA Fact Sheet Investigations of Molybdenum in Groundwater and Surface Water at Former Tronox/Kerr-McGee Facility, Soda Springs, ID. (2 pp, 466.44 KB)


EPA Fact Sheet Investigations of Selenium in Groundwater and Surface Water at the Monsanto/P4 Soda Springs Plant, ID. (2 pp, 455.07 KB)


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.