You forgot to mention all the superfund sites that have only recently been cleaned up. Some of which aren’t done yet.

These sites are all on the Jordan river, and it’s tributaries, which empty into the great salt lake.

https://en.wikipedia.org/wiki/Jordan_River_(Utah)#Pollution

I used to live within walking distance of the Jordan river, in Rose Park by the fairgrounds. I remember getting warned not to play in it.