Can you drink the tap water in Japan?
Short answer
Yes, anywhere in the country — including from the drinking fountains in stations and parks.
Yes, and the standard is unusually strict
Tap water is treated to drinking standard everywhere in Japan, including small towns and rural areas. Utilities test continuously and publish the results; Tokyo's waterworks bureau makes its figures public.
There is no region where the advice changes, and no need to boil, filter or buy bottled water as a precaution. Bottled water sells well here because people like the taste or the convenience, not because the tap is a risk.
Water in restaurants
A glass of cold water or tea arrives before you order, free, without being asked. It is refilled the same way. This is standard from a counter ramen shop to a hotel dining room.
You never pay for it and you never need to request it. If your glass is empty and nobody has noticed, catching a server's eye is enough.
Fountains and refills
Stations, parks and public buildings have drinking fountains, and using them is ordinary rather than a last resort. Refilling a bottle at one is normal behaviour.
The one place the taste changes is inside older buildings, where water may sit in a rooftop tank before reaching the tap. It is still safe; it just tastes of the building rather than the supply.
Good to know
- Refilling a bottle at a station fountain is ordinary behaviour
- In older buildings the water may taste of the roof tank rather than the supply
No. Boil it or drink bottled — the kettle in every hotel room is there for exactly this reason.
The Bangkok utility certifies its supply as safe and drinkable. What that certification cannot cover is the building you are standing in — or anywhere outside its three provinces.
No — the instruction from the tourism board is to stick to bottled water. Read the rest of that sentence carefully though: the caution about ice is written for rural areas, not for the whole country.
Yes — it is safe and heavily tested. Almost nobody drinks it straight anyway, out of habit rather than doubt.
In Taipei, yes — the city's water department certifies it directly drinkable. That certification is Taipei's own, and it does not travel with you.