Is Yokohama Tap Water Safe To Drink?

Yes! The tap water is safe to drink.

Yes, tap water in Yokohama, Kanagawa, is safe to drink. It is treated and regularly tested by the Yokohama Waterworks Bureau to meet Japan’s national drinking water standards.

Find clean drinking water on your travels with our iOS app 🚰

Water Sources
Drinking Fountains

The water is suitable for drinking straight from the tap in homes, hotels, and public facilities. If a building has old internal plumbing or a storage tank, the taste or quality can vary, so letting the tap run briefly may help.

Last checked: 2026-08-31

Japan is ranked as number 38 globally with a score of 78.7% in the water quality EPI research conducted by Yale University.

Source of Water in Yokohama, Japan

Yokohama’s tap water comes from surface water in Kanagawa Prefecture, primarily the Doshi River, Sagami River, and Sakawa River systems. These rivers and their reservoirs collect rainfall and mountain runoff.

The water is treated at Yokohama Waterworks Bureau facilities, including the Kawai, Nishiya, and Kosuzume purification plants. After treatment, it is distributed through the city’s water supply network.

Yokohama Drinking Fountains

Public drinking fountains in Yokohama, Kanagawa are generally safe to use because Japan’s municipal tap water is treated and regulated to meet national drinking water standards. Fountains connected to the public water supply are normally suitable for drinking when they are operating properly.

Check that the fountain is clean, undamaged, and clearly intended for drinking before use. Avoid water from a fountain marked as non-potable or one with visible dirt, unusual odor, or poor flow.

Drinking Water Map

Here is a map showing all the locations of drinking water spots in Yokohama. You can click on each water drop to open the spot directly in Google Maps for directions. For easy access on the go, download our iOS app to find water fountains nearby.

Nearby Places

About the Author

Hi, I'm Emily Hartman, a researcher and water quality specialist with a background in public health.

I've spent the last few years studying how everyday water systems impact our health, and I'm passionate about making that information clear and useful for everyone.

Safe, clean tap water isn't just my job, it's something I truly care about.

Disclaimer

* The information provided on this website regarding the safety of tap water in Yokohama is sourced from reputable sources such as the World Health Organization (WHO), local water authorities, and the Environmental Performance Index (EPI) from Yale University. While we strive to ensure accuracy and reliability, it's important to note that water quality can vary over time and may be subject to factors beyond our control. Users are encouraged to verify the current water quality status with local authorities or consult additional resources before making decisions regarding water consumption. We disclaim any liability for actions taken based on the information provided on this website.