This happened 4 months ago. They waited 4 months to make it public.

"The agency also reiterates that the leak poses no health risk at this time, but added that the “main potential health risk from this event is the possibility of radiation exposure to the public.”

I guess they say everything is ok so it's ok.

https://globalnews.ca/news/9559326/nuclear-power-plant-leak-radioactive-water-minnesota/