Well, I come from the UK. We don't have the same political issues you do, but to make up for that, we have special problems. While British water is completely safe, there are still some issues...
- ancient Victorian infrastructure means that there are leaks. They're terrified of contaminated water getting into the system, so they crank the pressure up, to ensure that any leaks happen outwards. This, of course, makes the leaks worse.
- even so, the water has to be chlorinated, and in some areas, quite heavily. You will never forget the first time you turn on a tap and get gassed.
- some really old houses still have lead pipes. I was taught as a child that if I wanted to drink water, I should let the water run until it went cold before filling a glass.
- some not-so-old houses still have a low-pressure water system which runs things like hot water, bathroom taps, etc. Traditionally these run off a tank in the loft, filled from the mains. This tank is frequently unsealed, and so fills up with sludge, moths, dead rats, etc. Even today, do not drink water from the hot tap unless it's obviously at mains pressure (which means it's connected to the mains via a sealed high-pressure water tank or a heat exchanger). (The reason for this is to enforce a vertical drop between the water mains and the house system, so that if the pressure ever falls in the water mains, there's no risk of sucking contaminated water back up the pipe. In such houses, there is a single source of potable water, which is the cold tap in the kitchen.)
- even then the water out of some of the aquifers is so hard as to be nigh undrinkable. Soap works markedly better in Scotland than it does in south-east England, and if you go to Cambridge you might as well not wash.
Of course, a lot of this is now being fixed, although slowly and painfully --- I think lead pipes are now no longer a thing. But it really makes me appreciate how good the water is in Zürich.