Asia
Katsushika-ku
Japan
Quick Answer
Tap water is safe to drink.
Traveling to Katsushika-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 Katsushika-ku is treated to national standards and safe to drink; carry a refillable bottle. If you have a very sensitive stomach or are staying in an older private building, you may prefer bottled water as a precaution.
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
Tokyo's water supply for Katsushika-ku is drawn from the Tone, Arakawa and Tama river systems and treated at metropolitan purification plants with filtration and chlorination before distribution. The Tokyo Metropolitan Government Waterworks manages treatment and monitoring to meet strict national and international standards.
Travel Safety Information
Pickpocket Risk
Low
Night Safety
Mostly safe
Scam Risk
Low
English Level
Moderate
Best Time to Visit
March to May and September to November
🛒 Don't Forget Your Travel Essential
Be prepared for your Katsushika-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.