Asia
Koto-ku
Japan
Quick Answer
Tap water is safe to drink.
Traveling to Koto-ku? Stay Hydrated Safely
Even in safe destinations, a portable water filter gives you peace of mind for your adventures.
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Tap water in Koto-ku (Tokyo) is treated to high standards and safe to drink; most visitors can use tap water and ice without concern. If you are sensitive to a slight chlorine taste, consider bottled water or a small filter for drinking.
Tap Water Usage Guide
Brush Teeth
Yes
Ice Cubes
Safe
Wash Fruit
Yes
Shower
Yes
Restaurants
Varies (often available on request)
Locals Drink
Yes (commonly)
Water Quality Score
Water Quality
Good
Water Source
Koto-ku is served by the Tokyo Metropolitan Waterworks; water is sourced mainly from the Tone and Tama river systems and associated reservoirs and is treated at modern plants using coagulation, filtration, activated carbon and disinfection to meet strict national standards.
Travel Safety Information
Pickpocket Risk
Low
Night Safety
Mostly safe
Scam Risk
Low
English Level
High
Best Time to Visit
March to May and September to November
🛒 Don't Forget Your Travel Essential
Be prepared for your Koto-ku trip with a portable water filter. Perfect for travel, hiking, and peace of mind.
View on Amazon→Other Cities in Japan
Tokyo
Japan
Tokyo tap water is treated to high standards and is safe to drink, use for brushing teeth, and for ice. If you have a very sensitive stomach, bottled water is widely available.
Osaka
Japan
Osaka tap water is treated to high standards and is safe to drink, use for brushing teeth, and ice; choose bottled water only if you prefer the taste. Bottled water is inexpensive and widely available if you want convenience or familiarity.
Kyoto
Japan
Kyoto tap water is treated to drinking standards and is safe to drink and use for brushing teeth and ice; bottled water is optional for taste preferences. If you stay in very old wooden houses (machiya) with aged plumbing, consider using a simple filter or bottled water for peace of mind.
Nagoya
Japan
Nagoya tap water meets Japanese safety standards and is safe to drink, use for ice, and brush your teeth. Carry bottled water only if you prefer the taste or are staying in very old buildings with uncertain private plumbing.