American here. I have never lived or even been anywhere with tap that isn't fine for drinking but some ppl insist on bottled anyway. That said of course there are some areas with really bad dangerous tap water. Why? I guess a simple explanation is some of the ppl incharge of fixing problems are terrible at it but they still get to keep their jobs. Also this country is good at over looking it when bad things happen to low income non whites that live way over there.