Speculation on my part based on other sources I've read, but likely related to water sources being contaminated in general. Curious to know however how additional filtration did not clean out these chemicals.

I am so tired. No matter how hard people try to keep this stuff out of their bodies, the lack of regulation and lack of enforcement --or even regulation and enforcement being way too late-- makes the act of simply keeping chemicals out of ourselves impossible. The chemicals are everywhere.

In Minnesota, it’s almost certainly 3M (Minnesota Mining and Manufacturing).

PFAS was used in a lot of different things, the sources of major contamination are military bases and manufacturing plants, but it was used in a wide array of consumer products so there is some level of contamination almost everywhere.

Are we looking at the same map? The PFAS contamination truly does not follow population.