I keep hearing about this, but haven't delved into it.

Usually when they do a water release like this, or there's potential for contamination to interact with humans in other matricies, such as metals on mines being uptaken in berries and plants used in traditional use (consumption by first Nations), they will do a Human Health and Environment Risk Assessment (HHERA).

These HHERAs look at multiple exposure pathways and consider rates and likelihood of exposure. I find it hard to think that they didn't do this step with something as dangerous as treated waste water from a nuclear plant.