In its annual civilian plutonium declaration, published by IAEA as a document INFCIRC/549/Add.6/17, the United States reported no changes in its stock of separated civilian plutonium in 2013. As of December 31, 2013, the United States reported having 49.0 tonnes of separated plutonium. Of this amount, 44.4 tonnes are described as "held elsewhere", 4.6 tonnes - in unirradiated MOX fuel, and less than 0.05 tonnes - held in the fuel fabrication process. None of these numbers has changes since the 2012 declaration.

The amount reported by the United States in its INFCIRC/549 declaration is part of the 61.5 tonnes plutonium that the United States declared excess to its national security needs. Some of this material is still stored in weapons and weapon components.