We've traveled all over the country and have personally encountered it everywhere -- from Oregon to New York to central Florida...it's all over the midwest, in the Great Lakes -- seems to be anywhere there's farming.

I'm not sure what you do for that, though -- not sure it can be filtered, and boiling just makes it worse as it's toxic when it's dead. I'm honestly more terrified of cyanobacteria than PFAS, and it's everywhere.