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 Living Environment (March 2024).
From April 1, 2025, the fecal contamination index of effluent will be changed from the number of Escherichia coliforms to the number of Escherichia colis.
For details, please refer to the revised information (Water Pollution Control Law, Ordinance on conservation, etc. of Yokohama City Living Environment (Water Quality Related)).

Those who manage septic tanks (septic tank managers) are required by law to perform three maintenance (maintenance inspection, cleaning, legal inspection) regularly. 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 the advice, recommendations, or orders of the city regarding maintenance, you will be subject to imprisonment or fines.

※　After printing the leaflet (PDF: 1,550KB) on septic tank maintenance and management on both sides, fold it three rolls and use it.

Maintenance and inspection is the work of inspecting and adjusting equipment and equipment in septic tanks, and repairing them accordingly.
If the equipment breaks down or the septic tank is used without a disinfectant, dirty water will flow into rivers, etc.
Be sure to carry out maintenance and inspection.

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

[Inquiry]
　　The Kanagawa Prefectural Life Mizuho Association
　　Telephone: 045-830-5720

Cleaning the septic tank is the work of pulling out the sludge accumulated in the tank and cleaning and cleaning equipment and attached equipment.
If sludge accumulates too much in the tank, odor may occur or untreated sewage may flow out, which may affect the surrounding environment.

All aeration system requires at least once every six months, and other systems require 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.
Septic tank cleaning record slips are also required to be kept for 3 years.

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

It is the month when the cut was done.
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 Governor of Kanagawa inspects water quality inspection, appearance inspection, maintenance status, etc. Apart from maintenance 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 statutory inspection, please contact the inspection organization in charge of your district.

• Article 7 Inspection
  This inspection is performed between 3 months and 8 months after the start of use when a septic tank is newly installed, or when there is a change in structure or scale.
  Investigate 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.

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

The month in which the hole was opened was inspected.
The color of the seal changes every year.