The water is drinkable but in many places not what I would call tasty.

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.

Due 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.