That should be a CLUE!
Of course EVERY city will publish reports stating the water is absolutely safe to drink. Don't be concerned that it smells like a crusty athletic sock.
The water in Chicago is as clean to drink as our air is to breathe. We live dangerously. We drink tap in the restaurants, turn on red, don't stop fully at stop signs, cross in the middle of the street, fall asleep on the bus, and for some, even maintain allegiance to the Cubs.
Seriously though, I've traveled all over and we have great water compared to other places. The Water Dept. puts out an annual report that you can look at. Granted, the report isn't going to say anything bad so ...
This is something I recently heard. How true it is is another question..
We have a restaurant here in Chicago called Portillo's. In my humble opinion it is the best dog and beef in Chicago. Recently the company expanded nationwide and what i heard is that they actually ship Lake Michigan water to their locations (as far as LA) to steam their product.
This may not answer your question but at least you now know you can cook some mighty fine hot dogs here!