Source is the World Health Organization 2019. Reported by Al Jazeera, which is one of the most reliable news organizations that exists. Those places might have good drinking water but the places listed by the WHO/Al Jazeera provide safe water to a greater percentage of the population.
But yeah when I was in Switzerland I did notice that the quality of water was amazing. I was told it was so good that I could drink out of almost any public fountain.
my source^