Superfund Site Profile
The 9-square-mile Mountain Home Air Force Base (AFB) site is located on a plateau southwest of Mountain Home, Idaho. The U.S. Department of Defense established the base in 1943 as a training base for several bombardment groups during World War II. Site activities have included the use of hazardous materials for aircraft maintenance and industrial operations; on-site disposal of wastes in landfills and sanitary sewers; and the use of waste oil for fire training exercises and dust suppression. These activities contaminated soil and groundwater with hazardous chemicals. EPA divided the site into separate areas, or operable units (OUs), to better address cleanup. Remedy construction is complete at all OUs except OU-3 and OU-4, where remedial actions are underway.