If they were measuring dangerous levels of bioaccumulation then you can be sure we'd hear about it. You'd need to live 1000 years though given the levels we're talking about.
As it stands in our system today any awareness we may have about dangers will come far after the danger to us, and then we'll all say a collective 'oops' as we've had to do the last hundred times. Look no further than all the 'I [live near the plant/play on the field/drink the water] and have [cancer/autoimmune/rare disease/etc]' stories that keep coming out year after year.
Also we didn't really stop putting them in the water yet...
If it’s widely used and profitable to many, you can be sure you won’t hear from it.
Yes, did you know, fetuses start as single cells?