Water tastes pretty gross in coastal Spain. In countries like Albania I wouldn’t even drink it at all. On Greek islands it is safe but everyone buys water from the stores.
replyDue to the age of many places in Europe there is also still a lot of copper pipe used for tap water. Not deadly but also not very healthy. In Amsterdam over 20 percent of homes have copper pipes.
A few places in the US have tap water that tastes famously bad, largely due to where they get the water from. San Diego is a famous example. The water is safe and clean but discolored and the flavor is pretty awful.
replyMuch of the US has great tasting tap water.