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Mechanism of the sewer

Last Updated January 10, 2019

What is a drainage system?

Facilities such as drainage pipes for draining sewage from kitchens and toilets and rainwater that has fallen on the premises to sewer pipes. The maintenance will be done by everyone. Drainage facilities have the following differences depending on whether the connecting sewer is merged or diverted.

In the case of a confluence type

It is a method of combining sewage and rainwater into the sewer with a single drain pipe.

A picture in the case of a confluence type

In the case of a split-flow type

This is a method of dividing sewage and rainwater into sewage pipes and rainwater pipes in the sewer, respectively. Do not drain sewage into rainwater pipes. In addition, rainwater may flow into U-shaped ditch.

A picture in the case of a split-flow type

Obligation of flushing work

Areas where sewers have been maintained and sewage can be treated at sewage treatment plants are called "treatment areas." Washing work is required for those who own buildings in the treatment area. Washing work refers to the following work.

Construction of drainage facilities

Installation of drainage facilities for draining water from toilets and kitchens into the sewer must be done without delay after it becomes a treatment area. (Article 10 of the Sewerage Law
If the sewer is diverted, the drainage system must have a structure in which the sewage is divided into sewage and rainwater and drained to the sewer. (Article 8 of the Sewerage Enforcement Order

Drainage sketch

Work to remodel the toilets

The toilet must be converted to a flush toilet within three years of becoming a treatment area. (Article 11-3 of the Sewerage Law

Picture of remodeling of toilets

How to abolish septic tanks

If a septic tank is used even in a flush toilet, the septic tank must be abolished within three years after it becomes a treatment area. (City Sewerage Ordinance Article 15
In addition, when we abolished septic tank, we must submit septic tank abolition notice within 30 days. (Article 11-2 of the Septic Tanks Act

Construction to abolish septic tanks

After abolishing the function of the septic tank and cleaning and disinfecting, we will do it in the following two ways.

  1. How to Excavate all septic tanks (complete removal)
  2. A method of leaving the septic tank as it is and using it as rainwater storage, etc.

Inquiries to this page

Kohoku Ward Port North Public Works Office

Telephone: 045-531-7361

Telephone: 045-531-7361

Fax: 045-531-9699

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

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Page ID: 503-849-630

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