The city of Flint, Michigan, has entered the chat.
But in more seriousness there are plenty of mostly harmless impurities in many municipal water systems such as an excess of minerals i.e. "hard water" and water filters can improve the quality of water that is considered clean enough to drink.
Yeah, me too. If drinking water was unsuitable in my country, we'd hang the politicians from a lamppost or at the least talk about it endlessly in the newspaper until they did something.
My fridge has water hookup but no filter. It makes ice. I have never cleaned it. I put the ice in everything.
At the same time, I get really weird about drinking out of fridges at vrbos as they often have a water Dispenser with a filter and zero indication of when that filter was ever changed (never is a safe bet).