Nuclear-weapons and energy production have left a legacy of radioactive waste at 131 sites across the U.S. The top five that require remediation:
More than 45 years of producing plutonium for nuclear bombs left 53 million gallons of radioactive waste, much of it stored in leaky tanks.
SAVANNAH RIVER SITE, S.C.
This 310-square-mile facility produced plutonium and tritium for nuclear bombs and is now home to 38 million gallons of radioactive waste.
OAK RIDGE RESERVATION, TENN.
The national lab here was a research facility for nuclear reactors and weapons production. The legacy: 350 areas contaminated with radioactive waste.
IDAHO NATIONAL ENGINEERING AND ENVIRONMENTAL LAB
Once home to 52 nuclear reactors, the INEEL ended up with a stockpile of nuclear waste that's the size of a football field and 335 feet deep.
ROCKY FLATS ENVIRONMENTAL TECHNOLOGY SITE, COLO.
After nearly 40 years of producing nuclear weapons, this site was left with 100 tons of radioactive residue, including 3 tons of plutonium.