Superfund Site Profile
The Umatilla Army Depot (Lagoons) site occupies about 20,000 acres in Hermiston, Oregon. A storage depot for conventional munitions and chemical warfare agents has operated on site since 1941. Between the 1950s and 1965, the Army discharged wastewater from explosive washout operations into two unlined lagoons, contaminating soil and groundwater with heavy metals and explosive compounds. Following cleanup, operation and maintenance activities and monitoring are ongoing.