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About flushing work

Last update date April 1, 2024

When it becomes a processing area ...

The area where the sewer has been maintained and the sewer can be treated at the water reclamation center is called the "treatment area".
Those who own buildings in the treatment area are required to have the following flushing work.

Contents of flushing work and underlying laws and regulations
Washing work Contents Period Laws and regulations
Construction of drainage facilities Construction to install drainage equipment (drain pipes, etc.) for draining wastewater from toilets and kitchens into the sewer Without delay Article 10 of the Sewerage Law
Remodeling of toilets Construction work to convert the toilets into flush toilets Within 3 years Article 11-3 of the Sewerage Law
Construction to abolish septic tanks Construction to abolish septic tanks
※If you are using a septic tank even if it is a flush toilet, you must abolish it.
Within 3 years Article 15 of the Yokohama City Sewerage Ordinance

How to proceed with flushing work

For consultation and construction of flushing work, be sure to ask the Yokohama City Drainage Equipment Designated Construction Shop (hereinafter referred to as “Designated Construction Shop”).
Washing work cannot be performed unless it is a designated construction shop! !

  1. Check the details, costs, timing, etc. of the construction before contracting.
  2. If you want to use the subsidy / loan system, apply before starting construction.

Subsidy and loan system
(Example of construction)

  • Installation of drainage pipes from drains in toilets, kitchens, bathrooms, etc.
  • Installation of rainwater pipes until rainwater connection
  • Collect, clean, disinfect, and dig out dirt from septic tanks (toilet tanks)
  • Install a toilet bowl and a water tank, and use the water supply pipe to piping (in the case of a toilet).

About application for confirmation of drainage plan

When performing flushing work, you must submit a drainage plan confirmation application to Public Works Office in advance to see if the work conforms to laws and regulations, and receive confirmation from the mayor.
For more information, please contact Public Works Office.

About abolition procedure of septic tank

When we abolished septic tank with flushing construction, presentation of "use of septic tank abolition notice" is necessary.
Please refer to the Resources and Waste Recycling Bureau Business Waste Management Section page for how to submit it.

Subsidy and loan system

Yokohama City has established a subsidy and loan system in order to promote the flushing of toilets and the abolition of septic tanks. For more information, please contact Sewer Management Division or Public Works Office in each district.
Targets

Grant: Individuals and ordinary corporations
Loans: Individuals and SMEs

Procedure

As a general rule, please apply within 3 years after entering the processing area. However, if you find that the following reasons have passed three years, you can receive grants and loans, so please consult with Public Works Office in your ward.

[Reason for passing three years]

  • It was financially difficult
  • The building was scheduled to be removed or renovated.
  • There were civil problems such as leased land.

Be sure to apply along with the drainage plan confirmation application before starting construction. The application documents are in Public Works Office, each district.

Loan conditions

Have the ability to repay the loan.
You must have a joint guarantor. (The joint guarantor must have the guarantee ability and, in principle, must be a resident of the city. If you live in the same house, you cannot be a joint guarantor.

Method of repayment

Fund transfer: Fund transfer is available at handling financial institution of Motoichi only for residents of the city.
Delivery Notice: We will send you a delivery notice from the Sewerage River Bureau. Please pay at the financial institution within the payment deadline every month.

Amount of subsidies and loans

As shown in the table below. (The loan will be loaned in units of 1,000 yen.)

The following constructions are not eligible for subsidies and loans.

  • Washing work for new construction and complete renovation
  • Carpenter work such as replacing the floor of the toilet and repainting the wall
Grant (no refund required)
Category Grant criteria Grant amount Remarks
Subsidy for renovation of toilets Per toilet bowl 10,000 yen Applications submitted within one year from the notification of the treatment area
Subsidy for renovation of toilets Per toilet bowl 5,000 yen Applications submitted for more than one year from the notification of the processing area
Septic tank abolition construction subsidy 2 or less toilet bowls 10,000 yen Applications submitted within one year from the notification of the treatment area
Septic tank abolition construction subsidy 2 or less toilet bowls 5,000 yen Applications submitted for more than one year from the notification of the processing area
Septic tank abolition construction subsidy Up to 3 to 10 toilets 5,000 yen per piece Applications submitted within one year from the notification of the treatment area
Septic tank abolition construction subsidy Up to 3 to 10 toilets 2,500 yen per piece Applications submitted for more than one year from the notification of the processing area
Septic tank abolition construction subsidy More than 11 toilet bowls Up to 500,000 yen Subsidize the cost of cleaning and disinfecting septic tanks
Class 1 Special Grants Up to 500,000 yen social security households
Class 2 Special Grants Within 105,000 yen All family members (including the living together family) are exempt from income tax on city prefectural tax.

Loans (36 months repayment, interest-free)
Category Lending Standards Loan amount Remarks
Loans for renovation of toilets For one toilet bowl Up to 500,000 yen For each additional toilet bowl, the loan limit will increase by 200,000 yen.
Septic tank abolition construction loan 2 or less toilet bowls Within 400,000 yen For each additional toilet bowl, the loan limit will increase by 50,000 yen.
Loans for rainwater drainage diversion Per building Within 150,000 yen When constructing at the same time as the renovation of toilets and the abolition of septic tanks
Loans for construction of joint drainage facilities Per building Up to 230,000 yen When constructing at the same time as the renovation of toilets and the abolition of septic tanks
Loans for installation of drainage pump facilities in residential land Per facility Within 1,000,000 yen When constructing at the same time as the renovation of toilets and the abolition of septic tanks

The redemption amount per month (once) is in units of 50 yen, and if a fraction occurs, the entire fraction will be included in the first time.

Washing Spread Counselor

In Yokohama City, a flushing extension counselor visits homes and offices where flushing work has not been completed in the treatment area. We also accept consultations on water washing. If you have any inquiries, please contact Sewer Management Division.

Pamphlet on water washing

It is a pamphlet that answers various questions about flushing toilets and drainage facilities in kitchens.
It is distributed at the Public Works Office of each ward and at the Sewer Management Division of the Sewerage River Bureau.
Water-washing

Inquiries to this page

Sewer River Bureau Sewerage Pipeline Department Sewer Management Division

Telephone: 045-671-2832

Telephone: 045-671-2832

Fax: 045-641-5330

Email address: gk-kanrohozen@city.yokohama.lg.jp

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Page ID: 444-735-941

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