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Do you mean safe to drink, or nice to drink? In southern England, the water is very hard, which gives the water a taste that a lot of people find unpleasant. However, the water is harmless.
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Outside or extremely specific cases, such as Flint or post disaster (Earthquake, Hurricane, etc), the tap water in the US and Canada is perfectly safe to drink, everywhere.
Beyond that, I've found the water in Western to Central Europe perfectly safe, as well as Japan, China, the UAE, the Caribbean. Central America, except Costa Rica, would warrant some caution depending on exactly were you are. To young to remember some but I know for sure I've never gotten sick.
In Central & Southern Africa, I only drank tea/coffee (boiled) or bottled beverages. Though the hotels will probably insist the water in Capetown or Johannesburg is safe (expect the same in Mexico City).
Keep in mind, the people who live there drink the water and they haven't all expired so the water isn't necessarily dangerous. Some peoples' bodies overreact to otherwise harmless pathogens which leads to the proverbial Montezuma's Revenge.
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In much of the developed world and even some lesser developed countries, there is drinkable water on tap. Normally water is completely safe to drink in Canada and the USA but we do occasionally get a warning posted to avoid drinking water for certain periods of time when the processing facilities has detected an anomaly. Part of making sure tap water is drinkable is testing it regularly.
It has been a while since I have been to France but the tap water was drinkable then and so it is in all other European countries I have visited.
The WHO (World Health Organization) has guidelines for drinkable tap water and they have a website describing the state of things. Check the global map here.