Office of Environmental Management

The U.S. Department of Energy's Office of Environmental Management (EM) mission is to address the nation's Cold War environmental legacy resulting from decades of nuclear weapons production and government-sponsored nuclear energy research. This legacy includes some of the world's most dangerous radioactive sites with large amounts of radioactive wastes, spent nuclear fuel, excess plutonium and uranium, thousands of contaminated facilities, and contaminated soil and groundwater. Created in 1989, EM has the responsibility for completing the cleanup of this Cold War legacy and managing the remaining nuclear materials. Visit our cleanup sites page or explore the map below to learn more about the remaining cleanup sites across the country.