City science•October 14, 2026
How Tokyo treats its drinking water
Understand Tokyo’s filtration, ozone, activated carbon and chlorine stages, then find the relevant local results.
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Asia
Tokyo
Japan
✓
✓ Safe to DrinkQuick Answer
Tap water is safe to drink.
💧
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Detailed Guidance
Tokyo tap water is generally safe to drink from the municipal supply. Use normal building-plumbing caution after long stagnation and follow any official local advisory if one is issued.
Tap Water Usage Guide
🦷
Brush Teeth
Yes
🧊
Ice Cubes
Yes, if made from the municipal supply and handled hygienically
🍎
Wash Fruit
Yes
🚿
Shower
Yes
🍽️
Restaurants
Tap water is generally acceptable where served hygienically
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Locals Drink
Yes, the municipal supply is commonly treated as drinkable
Water Quality Score
92
Water Quality
Good
Water Source
Tokyo Waterworks publishes current water-quality data, quarterly inspection results, PFOS/PFOA and radioactivity results, and annual reports. Japan country travel-health guidance also says tap water is generally safe to drink and use in cooking.
Sources & review
Last reviewed:
Evidence basis: Direct local source
Freshness due:
The assessment cites a local utility or service-area source.
Tokyo Waterworks publishes current water-quality data, quarterly inspection results, PFOS/PFOA and radioactivity results, and annual reports. Japan country travel-health guidance also says tap water is generally safe to drink and use in cooking.
Travel Safety Information
Pickpocket Risk
Low
Night Safety
Mostly safe
Scam Risk
Low
English Level
High
Best Time to Visit
March to May and October to November
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Other Cities in Japan
Osaka
Japan
Osaka tap water is generally suitable to drink when it comes from the regulated public supply. Check local notices and building plumbing if you are in older housing, temporary accommodation, or after service disruptions.
Kyoto
Japan
Kyoto tap water is generally suitable to drink when it comes from the regulated public supply. Check local notices and building plumbing if you are in older housing, temporary accommodation, or after service disruptions.
Nagoya
Japan
Nagoya tap water is generally suitable to drink when it comes from the regulated public supply. Check local notices and building plumbing if you are in older housing, temporary accommodation, or after service disruptions.
Yokohama
Japan
Yokohama tap water is generally suitable to drink when it comes from the regulated public supply. Check local notices and building plumbing if you are in older housing, temporary accommodation, or after service disruptions.
Further reading