Septic tank maintenance

Due to the revision of the Water Pollution Control Law Enforcement Ordinance (January 2024) and the revision of the Ordinance for Enforcement of the Ordinance on conservation, etc. in Yokohama City (March 2024).
From April 1, 2025, the feces pollution index for effluent will be changed from the number of coliform bacteria to the number of coliforms.
For details, please refer to the revised information (Water Pollution Control Law, Ordinance on conservation, Yokohama City Living Environment (Water Quality)).

Those who manage the septic tank (separation tank manager) are required by law to perform three maintenance (maintenance inspection, cleaning, legal inspection). If the septic tank is not properly maintained, it will affect the surrounding living environment, such as odor and water pollution, so be sure to implement it. In addition, if you do not follow advice, recommendation, order of Motoichi regarding maintenance, you will be subject to imprisonment or fine of fines.

※　Please print the leaflet (PDF: 1,408KB) on septic tank maintenance after printing on both sides and then fold it in three rolls.

Maintenance inspection is the work of inspecting and adjusting the equipment and equipment in the septic tank, and performing repairs accordingly.
If the septic tank is used without the equipment breaks down or there is no disinfectant, dirty water will flow into rivers, etc.
Be sure to carry out maintenance and inspection.

Maintenance inspections can be outsourced to a septic tank manager with specialized knowledge and skills.
The maintenance and inspection record sheet must be retained for 3 years.

[Inquiry]
　　Kanagawa Prefectural Life Mizuho Zenkyokai
　　Phone: 045-830-5720

Cleaning of the septic tank is the work of pulling out sludge accumulated in the tank and cleaning and cleaning the equipment and accessories.
If sludge accumulates too much in the tank, dirt odor may be generated or untreated sewage may flow out, affecting the surrounding environment.

All aeration method is required at least once every six months, and other methods are required at least once a year.

In addition, you have you choose cleaning from the following septic tank cleaning business permission supplier list (18 companies), and please apply by telephone.
A septic tank cleaning record sheet must also be kept for 3 years.

[Cleaning completion certificate]
　When the septic tank cleaning is completed, a cleaning certificate (sticker) will be affixed near the septic tank.

The cut part is the month when the cleaning was carried out.
The color of the seal changes every year.

The statutory inspection is an inspection to comprehensively judge whether the septic tank is functioning properly, and an inspection organization designated by the Kanagawa governor inspects water quality inspection, appearance inspection, maintenance status, etc. Apart from maintenance inspection and cleaning, it is necessary to objectively grasp the function of the septic tank from the perspective of a third party, so be sure to take the test.

To apply for a legal inspection, please contact your district's inspection organization.

• Article 7 Inspection
  When a septic tank is newly installed or the structure or scale is changed, this inspection is performed between 3 and 8 months after the start of use.
  Check whether the installation status of the septic tank is appropriate and whether the septic tank is functioning properly.

• Article 11 Inspection (periodic inspection)
  This is a regular inspection conducted once a year. Check that cleaning and maintenance inspections are being carried out properly and that the septic tank is functioning properly.

[Legal Inspection Certificate]
　When you take a legal inspection, an inspection certificate (sticker) will be affixed near the septic tank.

The place where the hole was opened is the month in which the inspection was performed.
The color of the seal changes every year.