Vermont's health department says a radioactive isotope was detected in ground water at the now-shuttered Vermont Yankee Nuclear Power Station in Vernon.
The strontium-90 was found in water that is unavailable for consumption and at levels well below the U.S. Environmental Protection Agency's safe drinking water threshold.
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The health department says there is no immediate health risk.
The water was sampled in August and the Oak Ridge National Laboratory verified the strontium-90 on Jan. 29.
Entergy-owned Vermont Yankee stopped producing electricity in December after more than four decades online. The New Orleans-based company says it continues to comply with all monitoring programs.
The plant will sit for decades while its radioactive components cool. It's expected to cost nearly $1.25 billion to dismantle the plant, which likely won't occur before 2040.