Useful information, no doubt, but not to a brewer. There are two available routes: 1) get city hall on the phone and ask to speak to a chemist. They are measuring what you need to know but aren't reporting that data as they don't have to and most consumers wouldn't know what the data imply anyway.
2) Send a sample to Ward Labs and get a report on the most significant water parameters. You don't have to know what to ask for as they already do. The cost is modest. Option 2 is doubtless the better option unless, and this does happen, you tell the guy at the water works that you want to know this stuff because you are a home brewer and he says "Me too!". Don't count on this.