[nobody9999]

>Both bottled and tap water are too often full of stuff you don't want to be drinking.

https://bestlifeonline.com/best-drinking-water/

I guess that depends on where you are.

[tchaffee]

Yes, of course. That was my point. That the heuristic of "developed country" is not effective just because it's sometimes right.

Also take a look at the number of contaminants in the water for each those cities in your source. It's not zero for any of them.