Is a kumitori (pump-out) toilet a deal breaker?

Not legally, but most buyers replace it. Converting to a flush toilet usually means installing a combined jōkasō, often ¥1–1.5 million before subsidy. Factor this into your budget before offering.

Will the city pay for a new septic tank?

Many rural municipalities subsidise combined jōkasō installation in areas without sewer plans. Amounts and conditions vary by city, and you normally must apply before work starts.

Do I have to connect if a sewer main is in front of the house?

Usually yes. Within a sewer service area the law expects connection within a set period, and you pay a connection levy plus the pipe work on your land.

What does a jōkasō cost to run each year?

Expect roughly ¥50,000–100,000 a year for the legally required inspection, cleaning (pump-out) and electricity for the blower. Rates vary by tank size and region.

Septic vs Sewer in Rural Japan: Jōkasō, Kumitori & Costs

Septic vs Sewer in Rural Japan: What Every Akiya Buyer Should Check

8 min read

Quick answer

Rural Japanese houses use one of three systems: public sewer (best), a jōkasō septic tank (common and fine if it is a modern combined type), or kumitori pump-out toilets (old; most buyers budget about ¥1–1.5 million to replace). Check the listing's utility line, then confirm with the city's sewer department.

1. The three wastewater systems

Wastewater is one of the most underestimated akiya costs. The listing usually names the system in a single word, so it pays to know what each one means.

System	Japanese	What it means	Typical buyer action
Public sewer	公共下水 (kōkyō gesui)	House is connected to the city main	None — pay monthly usage fees
Combined septic tank	合併浄化槽 (gappei jōkasō)	Treats toilet and household water on site	Keep up inspections and cleaning
Toilet-only septic tank	単独浄化槽 (tandoku jōkasō)	Treats toilet water only; no longer installed	Plan to replace with combined type
Pump-out toilet	汲み取り (kumitori)	Waste held in a pit, collected by truck	Most buyers convert to flush

2. Typical costs

These ranges are typical only and vary by city, ground conditions and contractor. Always get a local quote.

Item	Typical range
Install combined jōkasō (5–7 person)	¥1,000,000–1,500,000 before subsidy
Sewer connection pipe work on your land	¥300,000–1,000,000
Sewer connection levy (some cities)	¥0–500,000
Jōkasō yearly running cost	¥50,000–100,000
Kumitori pump-out collection	Charged per visit or per volume

Try our renovation cost estimator to see how this fits your wider budget.

3. How to check a listing

Read the utility line (設備) on the listing or disclosure sheet for sewer, jōkasō or kumitori.
Ask the agent whether a jōkasō is combined or toilet-only, its age, and the last inspection record.
Call the city's sewer department (下水道課) to ask whether the address is inside a sewer service area or a planned one.
Ask whether the city offers a jōkasō installation subsidy and what the conditions are.

An AkiyaCheck report flags unclear or missing utility information so you know what to ask.

Frequently asked questions

Related guides and tools

True cost of cheap houses Renovation subsidies Renovation cost estimator