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LM’s mission is to fulfill the Department of Energy’s post-closure responsibilities and ensure the future protection of human health and the environment. DOE has taken significant environmental cleanup steps, and we are protecting the outcome of that work with long-term stewardship.
LM carries out its mission within the communities that made sacrifices for the nation during one of the most critical periods in our country’s history. This is accomplished through surveillance and maintenance, records management, an effective and efficient workforce, benefits continuity, asset management, and community engagement.
Areas of Focus
Sites
LM manages over 100 sites in the United States and the territory of Puerto Rico associated with past radiological and nuclear material production and testing, and energy research. Use the links below to explore LM’s sites.
LM Sites
Considered Sites Overview
Historic Sites
Transitioning Sites
Additional Information
Rocky Flats Stewardship Council members, LM, and LM Support Partners stop at the Solar Ponds Plume Treatment System during a tour of the Rocky Flats Site, Colorado.LM Programs
A variety of programs related to the country’s nuclear defense and energy legacy. Use the links below to view LM’s diverse programs.
AS & T
Aviation
DRUM
ESH&Q
ESL
Post-Closure Benefits
Programmatic Framework
Title X
Uranium Leasing Program
Services
From providing calibration facilities to offering educational programs, we are dedicated to serving the public. Use the links below to see the services that LM provides.
Calibration Facilities
ECHO
Property Management
Interpretive Centers
Records Management
Visitors learn how to make butterfly rings during the 2024 Monarch Madness event.Outreach
Dedicated to communicating accurate and timely information to communities impacted by former nuclear defense sites. Use the links below to explore the communication between LM and the public.
Interpretive Centers
Monthly E-Newsletter
Program Update
STEM with LM
Tribal Collaboration
Featured Items
Useful content from around LM. Use the links below to see important materials and information.
Interpretive Center News
Resources
Latest News
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New projects to ensure clean groundwater at LM’s sites in Tuba City, Arizona and Shiprock, New MexicoNovember 20, 2025
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Stay out and stay alive, reclamation expert advisesNovember 20, 2025
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Employees with LM Support Partners praised for keeping operations running smoothly and efficientlyNovember 20, 2025
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Revegetation effort will help set course for future management of mill-tailing disposal cellsNovember 20, 2025
Leadership
Contact Us
The Office of Legacy Management
U.S. Department of Energy
Office of Legacy Management
1000 Independence Avenue, SW
Washington, DC 20585