Thanks for the research Dr. Jones.
Point here is that the Milwaukee city water was contaminated and the city did not know it, did not detect it, wasn't even aware, until people were getting sick. We rely solely on municipal water treatment at our own peril. While probably 99.9% of the time it is "okay", fit for human consumption, there is that tiny fraction, of .1%, that can slip through undetected. Hopefully, things in the potable water supply infrastructure have improved since 1993, but I have a feeling
still happens. Even things like Flint, MI's lead poisoning, and I'm sure that there are a lot of other situations that have not made the headlines or haven't even come to light yet. The bottom line is, we should take steps to filter our water supply, in home, as a last line of defense against a slip up.