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About public sewer temporary use application

Last update date April 1, 2024

What is the temporary use of public sewers?

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

  1. Spring water, rainwater, construction drainage associated with civil engineering, construction work, etc.
    (For spring water and rainwater, when using a pump with a kettle area)
  2. Drainage from temporary toilets and hand-washing areas installed in temporary offices
  3. Accumulated water from caretaker holes for telegraph telephone, electricity, gas, etc.
  4. Sewage drainage associated with other construction work.

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

Drainage method

The drainage method (connection method to the sewer) is as follows.

  1. When discharging in a combined area, let it flow directly into the connecting 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 the human hole by laying the mounting pipe and flow in. However, please consult with Public Works Office about the connection position, construction method and restoration method.
  4. If there is no connection basin on or near the site, apply for self-financing at Public Works Office and install the connection basin and mounting pipe, and submit an application for temporary use.

Structure of drainage facilities, etc.

When draining construction drainage, etc., install drainage facilities as follows. (Excluding Temporary Office Miscellaneous Drainage and Temporary Toilet Drainage)

  1. Public sewerage facilities, road facilities, etc. that do not interfere with traffic.
  2. In the drainage facility, install a sedimentation tank that meets the following criteria.
    • A rectifier plate, cough, etc. will be provided so that no disturbance by running water will occur.
    • The sedimentation tank has two or more tanks
    • The average flow velocity is, in principle, 0.3 m/s or less.
    • In principle, stay time is 30 seconds or more.
    • Mud can be more than 60cm
  3. When discharging alkaline or acidic sewage, set up a neutralization tank and adjust it before releasing it. In principle, the neutralization tank must have a function to automatically stop the power pump when the water quality exceeds the standard value.
  4. In principle, the sedimentation tank shall have a structure that can measure the flow rate.

Water quality standards, etc.

Water quality such as drainage for construction is based on the regulations about conservation of Yokohama-shi living environment and Yokohama-shi sewer regulations (outside site) other than thing listed in the next table.
Water quality should be inspected at any time, and appropriate management should be performed to comply with legal standards.

Water Quality Standards Law
ItemsTreatment area
(Inflow into the sewage treatment plant)
Unprocessed area
(Not inflow into sewage treatment plants)
Hydrogen ion concentrationPH5 or less than 9HP 5.8 or higher 8.6 or less
Suspended substances
Bentonite
Other earth and sand, etc.
Less than 600 ppm70ppm or less

When we violate laws and ordinances or the above-mentioned standards and permission conditions, or when Motoichi deems it necessary, we may rebuild and relocate or remove drainage facilities. In this case, the cost will 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 work from the causal person, the causal person must carry out the restoration work.

Certification of drainage and sewerage usage fees

Authorization of drainage amount and adjustment of sewerage system usage fee are performed by the Sewerage River Bureau Accounting Section Sewerage Usage Fee. Please pay the sewerage fee by delivery letter of advice issued by Motoichi.
Sewer River Bureau Accounting Section Sewerage fee charge Phone: 045-671-2826

Application for permission

Please fill out the application form (download: PDF format (PDF: 65KB) and Word format (word: 40KB)) at least 7 days before release, and submit three copies to Public Works Office with required documentsrequired items.
In addition, about calculation method of estimated total drainage, please refer to calculation method (PDF: 21KB) of estimated drainage of temporary use of public sewer.

Contact information

List of Contacts
Contact informationPhone numberDetails of the inquiry
Sewer River Bureau Accounting Section Sewerage Usage Fees and Cashiers045-671-2826Report on the amount of wastewater and inquiries about sewerage usage fees
Sewer Management Division, Sewer River Bureau045-671-2832Reading of sewer ledger map attached to application
Water and Soil Environment Division, Green Environment Bureau045-671-2489Water quality standards for public water bodies
Resources and Waste Recycling Bureau Business Waste Management Section Weight Reduction Promotion Section045-671-3818Industrial waste

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Inquiries to this page

Totsuka Ward Tozuka Public Works Office

Telephone: 045-881-1621

Telephone: 045-881-1621

Fax: 045-862-3501

Email address: to-doboku@city.yokohama.lg.jp

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Page ID: 506-990-158

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