Calgary’s water is virtually pristine, thanks in part to having almost nobody upstream of us. Some complain about the chlorine content, but you just need to let the water sit for a little so that it evaporates out.
I find Toronto’s to be pretty good. But…every couple of years, we do have a taste and odour problem which is the result of higher water temperatures in the lake during the summer which results in the growth and decomposition of certain types of algae.
Even with upgrades at the treatment plants, they can’t totally remove the geosmin from the water.
I’d argue that any Great Lakes city has great tap water. Plus, any big city treats their water WAY better (reverse osmosis, UV, etc.) than any random small city or town with wells and a water tower or two, which may get a bit chlorine or polyphosphate added but probably doesn’t, IME.
I’m so glad it’s been a couple of years since the last time that happened… I’m usually morally opposed to drinking bottled water, but I make an exception for those few days. There’s no Brita in the world that can remove the flavour of dead rotten algae.
The rest of the time, though, I find Toronto’s tap water to be very drinkable. I’m reminded of how lucky we are each time I visit relatives in Ottawa and Kingston, where the water always seems to have a chalky aftertaste.
I would doubt that any city would use reverse osmosis. The expence would be beyond belief.
I live in San Jose Ca. My advice to anyone who drinks our tap water is to chew it first before swallowing. Depending on the location in the city and and time of year the hardness can be over 700 ppm hardness. Most of our water is from wells.
San Francisco is almost pure. It runs about 10 parts. But the unfilter water has a lot of particulate matter. the water comes from the Hetch Hetch dam near Yosemite. There are wild animals and fish that do what is natural near water.