Toronto & surroundings TDS
You have my husband in a state! He knows the water pretty well all over the area. "pH can't be that high!" (Harrumph) If you are comfortable, where are you? (He's just curious!) We're in Bolton and yes, we have lake Ontario water. It's hard, but not very and pH of 7.4.
If your son is in the city his water is probably the same as mine. Your water would be similar - lake water is usually fairly soft. The wild card is the artesian well...