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Japan

Yes. Tap water in Japan is low risk across 10 listed water systems. The safety figure is national, not a town-by-town test.

NationwideOkinawaNationwide
Open an area for its towns. Green means every listed water system there is low risk. Orange or red means every listed system is high or critical risk. Any other area has mixed ratings. The colour uses the national safety figure, not a separate test of each area. Okinawa is drawn apart from the mainland.
Nationwide10 water systems · 10 low risk

Source

Japan Water Works Association, FY2023 tap-water quality distribution table.

Period covered: April 2023 to March 2024.

Japan’s free national file does not name each city. From April 2023 to March 2024, 3 of 9,359 tap-water series were positive for E. coli at least once. The other 9,356 were negative all year. A series is counted positive if it was positive even once. These pages list major cities with that national figure.

Common questions

Can I drink the tap water in Japan?

Yes. Tap water in Japan is low risk across 10 listed water systems. The safety figure is national, not a town-by-town test.

Where do these ratings come from?

Japan Water Works Association, FY2023 tap-water quality distribution table. Period covered: April 2023 to March 2024.