List of designated water supply equipment construction companies

With designated water supply equipment construction company, designation system of designated water supply equipment construction company was established by water supply law revision of 1996, and based on application of person performing water supply equipment construction business under uniform requirements nationwide , Water supply company (Water Works Bureau) designated as construction company.
Designated water supply equipment construction companies are designated for each water supply company (Water Works Bureau), but the designated standards are not specified by the water supply company (Water Works Bureau), but are designated by the Water Supply Law as a uniform requirement nationwide. Standards are set. The criteria for designation are "location of persons who will be appointed as chief engineer of water supply equipment construction at each business site", "holding of machinery and equipment specified in the Water Supply Law Enforcement Regulations (machinery and equipment for cutting pipes, pipes) Machinery and equipment for processing. Machinery and equipment for joining, water pressure test pump) ”and“ Person who does not meet certain disqualification requirements ”.
When person who applied for designation conforms to designated standard to prescribe in Water Supply Law, it is said that water supply company (Water Works Bureau) must make designation.
When we perform water supply construction (except minor change) such as new construction, remodeling, removal of water supply equipment in Yokohama city, based on rule of "water supply law", "Yokohama-shi water supply regulations", Yokohama-shi designation water supply equipment construction by company and construction are necessary.
※Minor changes do not involve plumbing work, and refers to the replacement and repair of a single faucet and the replacement of water supply equipment parts installed at the end of the water supply device such as tops and packing.

The water supply equipment is a private property, and a contract for water supply work is to be made between the owner or user and the designated water supply equipment construction company. Regarding the contract, Water Works Bureau cannot intervene.
When making a request, please check the following contents carefully, and make a request (contract).

1. Please explain to the waterworks contractor about the details of the desired construction and the local situation.
2. Please receive a sufficient explanation in advance about the construction details, required time, estimated amount, etc.
3. Please take quotes from multiple people as much as possible and consider the contents. Please note that estimates may be charged, so please check in advance.
4. If you are not satisfied with the bill, please ask for a breakdown of the billed amount and confirm any questions.
5. If you have any questions during construction, please check with the construction company on the spot.
6. If you make an emergency request on a holiday or night hours, please check in advance as the fee may be higher than usual.

Designated water supply equipment construction company

Excel (all business operators) (Excel: 210KB)

PDF (PDF: 332KB) (Business in Yokohama City) / PDF (PDF: 361KB) (Yokohama suburban company)

　As of April 15, 2024
・Listed for each location of the construction company.
・It is updated to the first business day of the following month on the 15th of each month (or the next business day if it is a holiday).