Excellent!

Someone in the industry!
I'm in Chicago Matt, where about are you? You mentioned another variable, the employment structure of the municipality.
Here it is very patronage oriented, on the weekends you may well have some alderman's nephew, who can't really get a job anywhere else, on the weekend graveyard shift. In a way it does have to do with being a bit thick here, though no buckets, a little computer adjustment. It also has to do with weather if you are dealing with a surface source, or often seasons with a well, as wells can involve agricultural runoff, and seasonal precipitation variations.
I've been dealing with my water supply for many years, and in that time have talked various situations over with many people involved with my water supply. I could go on about industrial waste, a river that was made to run backwards, usually, and so on, but it would be a long one. While some of these things may apply to others water supplier, some may not.
I have also talked with other aquarists around the Midwest, going to out of state auctions is also about networking, water is one of the topics often covered. If I'm buying a fish bred in Indiana or Michigan I want to know what their water is about, which often leads to a discussion about water supplies.
Best thing to do is contact someone knowledgeable with your water supplier. This is something I, as well as local aquarists keep close tabs on.
It will be good to hear your wife's input on this, another source of reference in the industry.