US here, live in the vicinity of Boston, Massachusetts. Water is very safe out of the tap - we get an annual report of what's in it from the Mass. Water Resource Authority (MWRA) and it's tested regularly. Tastes good too, if I'm honest. I would say that MOST developed areas of the US have perfectly safe drinking water out of the tap, though it doesn't all taste very good (looking at you, Washington DC). However there are some more rural areas where the water out of tap is not safe for drinking, and where boiling or bottled water is recommended. I remember traveling out west back in 2010 and being surprised at this.