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About purpose of water supply construction

Final update date December 28, 2018

Until tap water is made

Tap water is manufactured in the following process and delivered to everyone.
Process of producing tap water

Types of water pipes

Types of water pipes
water pipeFrom water intake point to water purification plant
Water supply pipeFrom the water purification plant to the reservoir
Water distribution pipeFrom the reservoir to the branch of each household
Water supply pipe
(Customer ownership)
From the branch of the water pipe to the faucet

Seismic improvement of water supply facilities

The water supply facility in Yokohama has a long history as the birthplace of modern water supply in Japan, and the Kawai Water Purification Plant was completed in 1901 (Meiji 34) and the Nishiya Water Purification Plant was completed in 1915 (Taisho 4). This facility, which has supported the modernization of Japan, is aging and some facilities lack earthquake resistance.
For example, at the Nishitani Water Purification Plant, the following reservoirs were constructed for earthquake resistance.

Nishitani Water Purification Plant Overview

(1)Inside the reservoir and before reinforcement

(2)Reinforcing the floor

(3)Reinforcement of columns


It is reinforced assuming an earthquake of 7 to 8 in magnitude 7-8 earthquake is assumed.
The width of each pillar is reinforced from 50cm to 100cm, and the thickness of the floor is reinforced from 25cm to 55cm.

Seismic improvement of water pipes

The transmission and distribution pipes in Yokohama city are about 9,000 km, and those that have been maintained in large quantities during the period of expanding water demand since the 1970s have been gradually renewed. Therefore, in Water Works Bureau has been gradually updating old pipes that cause water leakage rupture and water quality deterioration to water pipes with excellent earthquake resistance in preparation for earthquake disasters.
As we update the whole city sequentially now, we will perform update construction in future even if it is place where we do not perform construction now, but mutual understanding, cooperation of all of you is indispensable for this construction It has become.

Water pipes with holes due to corrosion

Wrap a polyethylene film on the new water pipe to prevent corrosion.

Workplace landscape

New construction of water pipes

At the time of residential land development, a new water pipe will be buried and laid where the water pipe is not laid.

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

Water Works Bureau Customer Service Center

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

Inquiries to this page

Water Works Bureau General Affairs Division, General Affairs Department

Telephone: 045-671-3105

Telephone: 045-671-3105

Fax: 045-212-1155

Email address: [email protected]

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