There were accidental (?) discharges in the river when the plant was running.

The Indian Point nuclear power plant in New York was closed in 2021, but there's still about a million gallons of radioactive water to deal with. Holtec international just wanted to dump it in the Hudson River in May, but word got out & there was an uproar. They are now trying to convince the public that filling a river with tritium isn't so bad.