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
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Water sources of Yokohama City
Last update date April 3, 2024
Yokohama has five water sources: Doshi River, Sagamiko, Banyu River, Corporate Sakawa River, and Sagami River Corporation Sagami River, for a total of 1,955,700 m3 per day.
Water source of Yokohama City (PDF: 1,327KB)
What is a corporate association?...
A part-office union established by four organizations: Kanagawa Prefecture, Yokohama, Kawasaki City, and Yokosuka City for the purpose of avoiding overlapping investment in water supply facilities and efficiently arranging and managing facilities.
Doshi River line
Abalone water intake
One kilometer upstream of the Aoyama Water Source Office (Aoyama, Tsukui-cho, Sagamihara City, Kanagawa Prefecture) takes 172,800 m3 of water from the Doshi River per day, and sends it to the Kawai Purification Plant via the Aoyama sinking pond.
To the Doshimura government office homepage (outside site)
Sagamiko line
Numamoto Dam
Sagami Dam
The water stored in Sagamiko and used for power generation is taken 394,000 m3 a day at the Numamoto Dam downstream, and sent to the Nishiya Water Purification Plant via the Tsukui Diversion Pond, Sagamihara Sinking Pond, and Kawai junction well.
Banyu River line
Lake Tsukui and Shiroyama Dam
Samukawa Water Intake
The water stored in Lake Tsukui and the small and medium-sized rivers flowing into the Sagami River downstream are taken by the Samukawa Water Intake (7 km upstream from the estuary) and send 284,700 m3 per day to Kosuzume Purifiction Plant.
Corporate Corporation Sakawa River System
Lake Tanzawa and Sanbo Dam
Iiizumi Water Intake
The water stored in Lake Tanzawa, upstream of the Sakawa River is taken by the Iiizumi water intake downstream, and the Kanagawa Prefectural Wide Area Water Supply Corporation takes 1,564,300 m3 a day and sends it to the Isehara, Sagamihara, and Nishi-Nagasawa water purification plants. The amount of water in Yokohama City is 605,200m3 per day.
Corporation Sagami River System
Lake Miyagase and Miyagase Dam
Sagami large zeki
With the completion of the Miyagase Dam upstream of Nakatsugawa, full-scale water receiving was started in 2001. The water stored in Lake Miyagase is taken by the Kanagawa Prefectural Wide-area Water Supply Corporation in the Sagami River and sends it to the Ayase Water Purification Plant.
The amount of development is 1,300,000 m3 per day, of which 499,000 m3 for Yokohama City.
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For inquiries to this page
Water Works Bureau Facility Department Planning Division
Phone: 045-671-3061
Phone: 045-671-3061
Fax: 045-212-1158
Email address: su-keikaku@city.yokohama.jp
Page ID: 592-255-620
