The Tokyo Metropolitan Government Bureau of Waterworks owns water
conservation forests that extend from Koshu City (Yamanashi Prefecture), which is located along the
upper reaches of the Tama River, to Okutama-machi(Nishitama District, Tokyo). These forests stretch
approximately 31 km east to west and approximately 20 km north to south, covering a vast area of about
24,000 ha (as of March 2018) (equivalent to about one third of the total area of the 23 wards of
Tokyo).
We undertake status surveys and conduct maintenance for these water conservation forests.
Survey to determine condition of water source forest
Water resource facilities such as dams and reservoirs help to adjust the
flow rate of rivers according to seasonal changes in precipitation and fluctuations in the water supply
demand by storing rainwater and snow meltwater.
The Murayama Reservoir and the Yamaguchi Reservoir
source their water from the Tama River. Raw water collected from the Ozaku Intake Weir and the Hamura
Intake Weir is transferred through the Tamagawa Waterworks to be stored in these reservoirs, from which
water is conveyed to the Higashi-Murayama Purification Plant and the Sakai Purification Plant. We are
entrusted by the Bureau of Waterworks Tokyo Metropolitan Government to manage the Hamura Intake Weir,
the Tamagawa Waterworks, the Murayama Reservoir, and the Yamaguchi Reservoir.
Screen unclogging
We monitor different water treatment processes, such as rapid filtration, membrane filtration, and advanced water purification. We also maintain facilities in purification plants and manage the water quality. Tokyo Water Co., Ltd. is responsible for some water distribution coordination work at purification plants and all work related to management of purification plants, including facility and machinery repair and construction design and supervision, in our commitment to providing a reliable supply of water that is safe and tasty.
The Bureau of Waterworks Tokyo Metropolitan Government has a vast water service area that covers 26 municipalities in the Tama District, with about 600 waterworks facilities (e.g., purification plants, water supplying and distribution stations, pump stations, and water source wells) scattered throughout the area. These facilities are divided into four areas (Northern Tama, Western Tama, Southern Tama East, and Southern Tama West) to facilitate concentrated management. We undertake around-the-clock operational management of these facilities.
Operation and maintenance of purification plants and the like using a concentrated management method designed for wide-area supply
We conduct inspections of electrical equipment, pump equipment, and other such machinery, carry out minor repairs, respond in the event of abnormalities, and perform various other activities at water supply stations, booster pump stations, and the like to ensure a reliable supply of water that is safe and tasty.
Inspection of facilities
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