Our Mission
The EM mission is to safely complete cleanup of the environmental legacy resulting from decades of nuclear weapons development and government-sponsored nuclear energy research, while restoring and revitalizing the communities that are home to legacy nuclear sites. EM is responsible for managing and directing the cleanup of contaminated nuclear weapons manufacturing and testing sites across the United States.
Cleanup Sites
The U.S. Department of Energy's Office of Environmental Management (EM) mission is to address the 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. Explore the map below to learn more about the remaining cleanup sites across the country and the Completed Cleanup Sites webpage for a list of completions.
Highlights
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By Assistant Secretary Tim WalshJune 23, 2026 -
The Hanford Waste Treatment Plant has reached a major commissioning milestone, successfully solidifying more than 100,000 gallons of Hanford tank waste into glass. May 26, 2026May 26, 2026
Latest News
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