It's good to be on the west side, I guess. Seriously, what's the source of the PFAS/PFOS contamination? Chemical plants?

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.

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