Septic tank installation notification and subsidy

Updated: July 2026, 4

Support for filing septic tank installation notifications and applying for subsidies.

Why not leave all that tedious paperwork to a certified administrative scrivener and focus on your actual work?

A septic tank installation notification is a document that must be submitted to the prefectural governor in advance when installing a new septic tank.
Local governments are required to check in advance whether the septic tanks to be installed "meet legal standards" and "will be installed correctly."
With the amendment to the Administrative Scrivener Act coming into effect in January 2026, we are seeing an increase in new inquiries from businesses that previously relied on septic tank installation companies to handle applications. We minimize your burden by offering a package deal that includes both installation notification assistance and subsidy application support.

Points to note when submitting a septic tank installation notification and applying for subsidies.

- Deadline for submitting the septic tank installation notification: Construction commencement dateUntil 21 days prior, It must be submitted and accepted by a certain date.
• Obligations after installation: After completion of construction workWithin 10 DateYou are legally required to submit a "completion report" and then undergo a statutory inspection.　
- Waiting for approval of grant: Waiting for the government office to say, "We will provide the subsidy."Issuance decision notificationYou must not proceed with the contract or construction until you have received the necessary documents.
- Budget on a first-come, first-served basis: Local governments have a budget limit, and even in the middle of the fiscal year...Ends when the budget runs out.Therefore, securing a spot early is essential.

Flow of the application process for installing a septic tank

Do you have this problem?

Concerns about "time and manpower"

• Due to a shortage of skilled workers, the company president himself is out on site, making it impossible to operate during government office hours (weekday daytime).
• Working on-site during the day and creating drawings and documents in the office at night has become the norm, resulting in a "double job" situation.

Concerns regarding "construction period and speed"

• Construction cannot begin until the application is accepted, so even a one-week delay due to a correction request from the government office throws the entire schedule into disarray.
• I was caught in a dilemma: the client was telling me to "hurry up," while the government office was saying "there are not enough documents."

Concerns regarding "specialized knowledge and legal revisions"

• The rules vary from one municipality to another; the requirements for attached documents and how to draw diagrams change, making it a hassle to look them up every time.
• Subsidies are often allocated on a first-come, first-served basis, and delays in preparing the necessary documents can lead to the budget being lost.
• They haven't been able to adapt to the legal changes.

Benefits of requesting

Overwhelming speed and capacity

Our double-check system, involving veteran staff at our nationwide locations, reduces the number of errors and returns on documents.
We handle everything from document preparation to application submission, allowing you to focus on your own business operations.

A database of "local rules" for all municipalities.

The required documents for septic tanks vary slightly depending on the ordinances and guidelines of each municipality.
Leveraging the vast knowledge accumulated at our locations nationwide, we achieve "one-shot acceptance" even in unfamiliar areas. This reduces the costs of resubmissions and back-and-forth due to revisions, ensuring that project deadlines are met.

Thorough compliance

The notification of septic tank installation is related to your company's "construction business license" and "septic tank construction business registration."
We checked for consistency not only with the Septic Tank Law, but also with the Construction Industry Law and the Waste Disposal Law.
As your partner in protecting your company's social credibility, we will proactively prevent risks.

Fee structure

General workflow for subsidies

①Subsidy grant application:
Before construction begins, you will need to submit an application form and necessary documents (quote, site plan, certification, etc.).
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②Issuance decision notification:
After review by the local government, you will receive a grant approval notice (usually about one month after application).
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③Construction work and intermediate inspection:
Construction will begin.
In some cases, a "mid-term inspection (on-site survey)" may be conducted by local government officials to check the progress of the construction.
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4Submission of performance report:
After the construction is completed, we will submit a performance report along with copies of receipts, construction photos, and maintenance contracts.
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Final inspection:
The local government will inspect the site and determine whether it was installed properly.
Subsidy Confirmation and Transfer: The amount will be finalized, and the subsidy will be transferred to your designated account.

FAQ

A "single-unit septic tank" is a septic tank that treats only human waste (wastewater from toilets), and its installation is no longer permitted. A "combined treatment septic tank" is a septic tank that treats all wastewater from homes and other sources.

Please begin construction only after you receive the grant approval notice. *Construction started before the grant approval notice will not be eligible for the subsidy.

Please contact the environmental department of your local municipality.

Once the septic tank installation work is complete, please submit the performance report promptly. After that, a final inspection will be conducted, and if there are no deficiencies in the performance report and the final inspection, the payment will be transferred to the designated account.

Please check with your neighborhood association or local water users' association regarding the discharge destination of treated wastewater from your septic tank.

The calculation of the number of people to be processed is determined by the Japanese Industrial Standard (JIS A3302-2000), and in the case of residential facilities, it is determined by the total floor area of ​​the residence in question.

The revised Septic Tank Law, enacted in 1, prohibited the installation of single-unit septic tanks in principle, and users of single-unit septic tanks were required to endeavor to convert to combined-unit septic tanks. Currently installed single-unit septic tanks are still usable.
While many such businesses still exist, we urge them to utilize subsidies and make a swift transition.

In principle, each building must have its own septic tank. Subsidies must be applied for separately for each septic tank.

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