Overview of Industrial Water Supplys

Industrial water supply is a water supply that supplies water used for industrial purposes such as cooling water, boiler water, product processing water, and cleaning water at factories and other places, and is the cornerstone of the city's industry. The water source for industrial water is from dam lakes in Sagamiko and Tsukui, which greatly contributes to the environment by preventing land subsidence due to excessive pumping of groundwater in the factory area.
In addition, since the process of chemical treatment and filtration treatment such as water supply is not performed, the raw water is basically settled and treated, it can be supplied as an economical water supply.

Brochure "Industrial Water in Yokohama City" (PDF: 5,253KB)

The industrial water supply in Yokohama City was established in October 1960 (1960) with a water supply capacity of 117,000 cubic meters per day (Sagamiko system) as a measure against land subsidence by pumping groundwater in the Keihin Industrial Zone, and Tsurumi / Kanagawa and Hodogaya / West districts. Water supply has started.

After that, two expansion work (Banyu River system) was carried out, and the water supply area was expanded to the industrial area in the inland area of Tozuka and the coastal area of Negishi Bay, and with a water supply capacity of 362,000 cubic meters per day, the period of high economic growth Has supported Yokohama's industry.

Since the oil crisis in 1973, demand has been declining due to the relocation or abolition of factories due to changes in the industrial structure and the rationalization of water use at water receiving plants. In recent years, new demand has also been created, such as the heat supply business associated with new town development such as the Minato Mirai 21 District and the wholesale power generation business water through deregulation of the electricity business, contributing to the creation of a new business base for the Yokohama economy as a new business in the Tokyo metropolitan area.

The industrial water supply facilities in Yokohama City consist of two systems (water sources): the Sagamiko System, whose water source is Sagamiko, and the Banyu River System, whose water source is Lake Tsukui.

The Sagamiko System Facility is a system that started water supply on October 10, 1960 for the purpose of preventing land subsidence in the Keihin Industrial Zone as a founding project.

The water source is Sagamiko (Sagami Dam), which uses a water supply system from the water intake under the dam (Numamoto Dam) to the Tsurugamine Sinkden Pond in Asahi Ward, and then sinks in the Tsurugamine Sinkden Pond, a sole facility, and then supplies water to the Tsurumi and Kanagawa districts via a part of Asahi Ward and the Higashiterao Reservoir in Tsurumi Ward.

In addition, water treated at Nishiya water purification plant is supplied to Hodogaya and west districts.

Sagamiko (Sagami Dam)

Tsurugamine sinking pond

Higashiterao Reservoir

The Banyu River system facility is a system that started water supply on September 1, 1965 as a base maintenance for the Inland Tozuka and the Negishi Bay coastal area by the first expansion project.

The water source is the Lake Tsukui (Shiroyama Dam), which is the co-operated facility of the Yokohama City Water Supply, Yokosuka City Water Supply, and Yokohama City Industrial Water Supply, and the Yokohama City Industrial Water Supply System. The water source is the Kosuzume Purifiction Plant, which is located on the border of Kamakura CityKosuzume Purifiction Plant.

Lake Tsukui (Shiroyama Dam)

Hikichi River Waterway Bridge

A little sparrow sinking pond

Water quality measurement equipment