The Low-Level Radioactive Waste Management Office (LLRWMO) was established in 1982 to carry out the responsibilities of the federal government for historic low-level radioactive waste (LLRW) in Canada.

The LLRWMO manages LLRW at several large and numerous small historic waste sites located throughout Canada, including locations in Ontario, Alberta and the Northwest Territories. Small volumes of LLRW are removed to the LLRWMO storage buildings at Atomic Energy of Canada Limited's (AECL) Chalk River Laboratories (CRL), whereas larger volumes of waste are typically managed at or near these sites.

At some of the historic waste sites, materials have been placed in interim storage pending the development and implementation of a long-term management approach. The LLRWMO provides ongoing monitoring, inspection and maintenance at these sites.

Historic waste at these sites includes contaminated soil, building materials and other items.