About public sewer temporary use

When we perform the following drainage including drainage for construction, and use public sewer temporarily, please submit public sewer temporary use permission application and receive permission of Public Works Office. (Yokohama City Sewerage Ordinance, Article 17, Paragraph 3)

1. Spring water, rainwater, drainage for construction work, etc.
   (For spring water and rainwater, when a pot is provided with a pot)
2. Wastewater from temporary toilets and hand-washing areas installed in temporary offices.
3. Accumulated water from caretaker holes such as telephones, electricity, gas, etc.
4. Wastewater associated with other construction work.

In addition, when applying, drainage methods etc. must conform to the standards. In addition, industrial waste cannot be drained.

Drainage method (connection method to sewer) is as follows.

1. When discharging in a combined area, let it flow directly into the connection basin.
2. When discharging in a diverted area, let it flow directly into the sewage connection basin.
3. Drainage associated with construction on the road (including underground) can be connected to a human hole by installing a mounting pipe. However, please consult with Public Works Office regarding the connection location, construction method and restoration method.
4. If there is no connection basin on the premises or near the site, apply for self-financing construction to Public Works Office, install the connection basin and mounting pipe, and submit a temporary application form.

When discharging wastewater for construction, install drainage facilities as follows. (excluding temporary office wastewater and temporary toilet drainage)

1. Public sewerage facilities, road facilities, etc., and traffic.
2. In the drainage facility, install a sedimentation tank that meets the following standards.
   • A rectifying plate, cough, etc., so that it does not cause disturbance by running water.
   • The sedimentation tank has a structure of two or more tanks
   • In principle, the average flow velocity is 0.3 m/s or less.
   • As a rule, stay time is 30 seconds or more.
   • Mudra is 60cm or more
3. When alkaline or acidic sewage is discharged, a neutralization tank is set up, adjusted, and then discharged. The neutralization tank must have a function to automatically stop the power pump when the water quality exceeds the standard value in principle.
4. The sedimentation tank shall have a structure in which the flow rate can be measured in principle.

Water quality such as drainage for construction is based on the regulations concerning conservation of Yokohama City living environment and standards such as the Yokohama City Sewerage Ordinance, in addition to those listed in the following table.
Water quality should be inspected from time to time, and appropriate management should be performed to comply with laws and regulations.

When we violate laws and ordinances or the above-mentioned standards and permission conditions, or when the city deems it necessary, we may rebuild and relocate or remove drainage facilities. The expenses required in this case shall be borne by applicant.
If the pipeline is blocked or damaged due to effluent such as construction drainage, restoration work costs for the facility will be collected. However, if there is an application for self-financing construction from the cause, the cause person to carry out restoration work.

Certification of drainage and adjustment of sewerage usage fees are handled by the Environmental Planning Bureau Accounting Section, Sewerage Usage Fees Section. Please pay sewerage system usage fee by delivery letter of advice that Motoichi issues.
Environmental Planning Bureau Accounting Section, Sewerage Fees Phone: 045-671-2826

Please fill in required items in the application form (outside site) and download required documents in the application form (outside site) with required documents, and submit three copies to Public Works Office at least 14 days before discharge.
In addition, about calculation method of estimated total drainage, please refer to calculation method (PDF: 159KB) of estimated drainage of public sewer temporary use.

For inquiries other than the above, please contact Public Works Office.
Public Works Office Phone: 045-491-3363

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