I'm from Wixom and we get our water from Detroit. I sent a sample to Ward Labs last August:
pH 8.1
Na 6
K 1
Ca 30
Mg 8
Total Hardness, CaCO3 108
Nitrate NO3 1.33
Sulfate SO4 21
Cl 10
CO3 6
HCO3 97
Total Alkalinity, CaCO3 89
The pH of the tap water is pretty meaingless for all grain brewers. Its the mash pH we care about.