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Water quality inspection point

Last Updated March 31, 2023

In order to deliver safe tap water to customers, we conduct water quality tests at locations necessary for water quality management. In addition to water quality inspections at faucets, water purification plants that make the tap water and water sources that incorporate the raw water are also set up and water quality inspections are regularly conducted.

If you want to know more about water quality inspection, go to Yokohama water supply (safe and secure water, tap water quality of Yokohama-shi).

If you want to know the frequency and items of water quality inspections, go to the water quality inspection plan.

Person who wants to know result of water examination, go to water examination result

Faucet (water tap)

Once a month for each system, such as water purification plants and corporate association water receiving water, we conduct water quality tests such as water quality standard items at faucets such as 15 parks in the city.
In addition, for water quality inspection items to be conducted at least once a day based on the Water Supply Law, multiple points are selected for each water distribution system and inspected at 43 locations.

Water treatment plant

We conduct water quality tests for each process to confirm that the water purification process is being performed properly.

If you want to know more about water purification treatment, go to the structure of the water purification plant.

Water sources

Since the water quality of the water source affects the treatment of water purification, water quality tests are conducted at the intake points of three water sources in Yokohama City (Doshi River, Sagamiko, and Banyu River system) in Yokohama City and upstream areas.

If you want to know the outline of the water source in detail, go to the water source in Yokohama City.

Inspection points (excerpted from water quality inspection plan)

Inspection point of faucet (water tap) and location of water purification plant

Inspection point of faucet (water tap) and map of water purification plant

Inspection point of water source

Map of water source inspection points

For inquiries regarding water supply, please contact the Water Works Bureau Customer Service Center.

Water Works Bureau Customer Service Center

Phone: 045-847-6262 Fax: 045-848-4281
※Please be careful not to make a mistake.

For inquiries to this page

Water Quality Division, Water Works Bureau Water Purification Department

Phone: 045-371-5656

Phone: 045-371-5656

Fax: 045-371-6942

Email address: su-suishitsu@city.yokohama.jp

Return to the previous page

Page ID: 199-997-330

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