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.
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Last Updated March 7, 2024
Kosuzume Purifiction Plant originates from the Sagami River, which flows through the center of Kanagawa Prefecture. Construction was completed in 1965 as the co-operated facility of Yokohama City (water supply and industrial water supply) and Yokosuka City in Yokosuka City. After two expansion work, the current water purification capacity is 1,009,200 m3 per day (about 3 cups of Yokohama Stadium). The purified water is supplied mainly to southern areas such as Konan Ward, Asahi Ward, Kanazawa Ward, Kohoku Ward, Totsuka Ward, Sakae Ward, and Izumi Ward, as well as Yokosuka City. It is responsible for about one-third of Yokohama City and about one-half of Yokosuka City.
Location | 2470, Kosuzumecho, Totsuka-ku, Yokohama-shi |
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Site area | 237,905m2 |
Standard processing capacity | 1,009, 2003/day |
Water sources | Sagami River (Banyu River) |
Sinking pond | Sludge blanket type (pal sweater) sinking pond 50,000m3/day × 14 pond, horizontal flow type sinking pond with sloping plate 80,000m3/day × 4 pond |
Filtration pond | 116m2 x 58 pond |
Distribution reservoir | Total effective storage capacity 137,300 m3 |
Mechanisms of Water Treatment Plant
It is the heart of a water purification plant, and operates and monitors all facilities around the clock.
Raw water arriving at a point 40 meters below ground is pumped up to the ground. Three of the six units are power-saving, and power consumption is reduced.
Removes suspended matter in raw water.
The photovoltaic panels prevent the growth of algae and at the same time effectively utilizes electricity.
Fine suspended matter is removed through a layer of sand. Solar power generation is performed using a cover to prevent foreign matter contamination.
Store tap water and send water to the city if necessary. The upper part is used by citizens as a sports park.
This is a cylindrical ground distribution reservoir. In addition to supplying water to the city, it is also used for cleaning water for filtration ponds.
In order to constantly send safe water, we constantly monitor the water quality of each water purification process.
After the water purification treatment is concentrated here, it is sent to the Sewerage River Bureau Nambu Sludge Treatment Plant for treatment.
We have installed three outdoor lights that light only the power generated by sunlight and wind power. This is one of the measures to reduce the environmental impact.
If you are worried about walking around the large area, we will guide you with an electric cart that does not disturb the environment.
Water Works Bureau Customer Service Center
Phone: 045-847-6262 Fax: 045-848-4281
※Please be careful not to make a mistake.
Water Works Bureau Water Purification Department Kosuzume Purifiction Plant
Phone: 045-851-1731
Phone: 045-851-1731
Fax: 045-851-7229
Email address: su-kosuzujosui@city.yokohama.jp
Page ID: 177-436-945