Water Bills in Japan Explained: What You Pay, When You Pay, and How to Avoid Surprises

2026年8月23日

Water Bills in Japan Explained: What You Pay, When You Pay, and How to Avoid Surprises

In Japan, a household water bill often covers two separate services: tap water and public sewerage. The local water authority usually collects both charges together, and many households receive a bill after a meter reading every two months—not every month.

The exact rates, billing cycle, and payment options depend on your municipality. Before budgeting, check who bills your address and whether water is billed directly, included in rent, or collected by your building manager.

Quick guide:

Water and sewerage charges usually appear separately on one notice.
Many cities read residential meters once every two months.
Charges commonly include a fixed or minimum amount plus a usage-based amount.
Bank transfer, credit card, payment slips, and some digital payments may be available.
A sudden increase can indicate a leak, but you must contact the utility to request an investigation or possible reduction.

This guide is for new residents, students, workers, and long-term tenants who need to understand their first Japanese water bill or compare charges after moving.

TOC

Your bill may contain two different charges

The most important point is simple: the amount labeled as your water bill may not be only for water supply.

A typical combined notice can contain:

Suidō ryōkin (水道料金): water supply charge
Gesuidō shiyōryō (下水道使用料): sewerage usage charge

The water charge pays for supplying treated water through the pipes. The sewerage charge pays for carrying away and treating wastewater if the property is connected to the public sewer system.

The two services may be managed by different public bodies even when one authority collects the combined payment. Tokyo, for example, normally collects sewerage charges together with water charges. Yokohama also states that households connected to public sewerage pay the sewerage fee with the water bill.

Do not assume that the second charge is a duplicate. It represents a different service.

When sewerage is not charged in the usual way

The standard combined bill does not fit every home.

Possible exceptions include:

A property uses a jōkasō (浄化槽), or septic treatment system, instead of public sewerage.
A home uses well water but sends wastewater into the public sewer.
Some supplied water does not enter the sewer, and the local authority recognizes a different discharge volume.
A landlord or building manager receives the main bill and charges residents under the rental agreement.

Tokyo generally treats the volume of tap water used as the volume of wastewater discharged. It uses separate methods for properties supplied by wells. Yokohama likewise explains that a person using well water may still owe a sewerage fee when that water enters the public sewer.

If your home has a septic system or private well, ask the municipality how sewerage or maintenance costs are calculated. The ordinary city-water formula may not apply.

How the amount is calculated

Most residential charges are not simply “number of cubic metres × one flat price.” A bill can combine a fixed component with progressively higher usage rates.

The calculation commonly depends on:

The amount used during the billing period
The diameter of the water meter or service pipe
The local water tariff
Whether the property uses public sewerage
The local sewerage tariff
Consumption tax and any authorized reductions

One cubic metre—shown as 1 m³—equals 1,000 litres.

Fixed, minimum, and usage-based charges

Look for these concepts on the bill or tariff page:

Kihon ryōkin (基本料金): basic charge
Jūryō ryōkin (従量料金): usage-based charge
Saitei ryōkin (最低料金): minimum charge
Shiyō suiryō (使用水量): volume of water used
Mētā kōkei (メーター口径): meter diameter

A basic or minimum charge means that using less water does not always reduce the bill in direct proportion. Two billing periods with different consumption can therefore produce the same total when both remain within a minimum-use band.

Higher consumption may enter a more expensive rate band. This is sometimes called a progressive tariff: the price applied to additional water rises after specified thresholds. It does not necessarily mean that every cubic metre is recalculated at the highest rate.

A real municipal example

Yokohama publishes a two-month sewerage example for 30 m³ of discharge. Its stated calculation is:

¥118 × 30 m³ − ¥1,020 = ¥2,520 before tax

That figure is the sewerage charge in the example, not the complete water-and-sewer bill. Yokohama’s water charge must be calculated separately using its water tariff, consumption, and meter size.

This distinction matters when comparing cities. A quoted “water rate” may exclude sewerage, tax, or the fixed charge. Compare complete bills for the same consumption period and meter size, not one headline rate.

ここがポイント: A low-use household can still pay a minimum or basic amount, while a high-use household may move into progressively more expensive bands. Check both consumption and the tariff structure before deciding that a bill is wrong.

Why many bills cover two months

Many Japanese utilities read ordinary household meters once every two months. Yokohama states this directly, while Tokyo says its normal sewerage collection is based on water-meter readings taken every two months, with monthly readings possible for very large users.

A two-month cycle changes how the total should be interpreted. A ¥6,000 bill covering about 60 days is not the same as a ¥6,000 monthly utility cost.

Check these items before comparing bills:

Shiyō kikan (使用期間): service or usage period
Kenshinbi (検針日): meter-reading date
Konkai shishin (今回指針): current meter reading
Zenkai shishin (前回指針): previous meter reading
Nōkigen (納期限): payment deadline

The normal usage figure is the difference between the current and previous readings, subject to the utility’s meter display and calculation rules.

A notice is not always the payment document

After a reading, you may receive a shiyō suiryō-tō no oshirase (使用水量等のお知らせ), meaning a notice of water consumption and related charges. It may also be called a kenshinpyō (検針票), or meter-reading slip.

Depending on the municipality and payment method, this notice may be informational rather than the document used to pay. A separate nōnyū tsūchisho (納入通知書) or payment slip may arrive by post.

Read the labels and deadline instead of taking every paper to a convenience store. If automatic payment is active, the notice may show the scheduled debit or payment result.

What to check on your first bill

Your first bill should match the property, contract, and period you actually used.

Check the following in order:

Name and service address: Confirm that the bill belongs to your home.
Customer number: Keep the okyakusama bangō (お客さま番号) for online procedures and inquiries.
Billing period: Make sure it does not include days before you became responsible for the property.
Meter number or meter size: Compare it with previous documents if available.
Usage in m³: Check whether the amount seems reasonable for the length of the period.
Water and sewerage lines: Confirm which services are included.
Payment deadline and method: Do not assume automatic payment has started until the utility confirms it.

In Tokyo’s English-mode water application, the customer number is described as a 10-digit number printed on documents such as a receipt or payment slip. Other utilities can use different formats.

If you rent an apartment

First read the lease and move-in documents. One of three arrangements is common:

You have a direct contract with the municipal or regional water utility.
The building manager receives a master bill and charges each unit.
A fixed water amount is included in rent or another monthly building charge.

If the landlord or manager bills you, ask how your share is calculated and whether the amount includes sewerage. The municipal tariff alone may not explain a building’s internal billing arrangement.

How to pay

Available payment methods are set by the local utility. Common options include:

Kōza furikae (口座振替): automatic bank-account transfer
Ongoing credit-card payment
A paper payment slip used at an approved convenience store, bank, post office, or service counter
A supported smartphone payment service or official utility app

Yokohama lists bank-account transfer, recurring credit-card payment, and mailed payment notices. Osaka lists bank transfer, credit card, payment slips, and supported smartphone payment methods. Tokyo lists account transfer, credit card, invoices, and options offered through its water app.

Automatic payment is useful, but confirm the start date

Submitting an application does not always activate automatic payment immediately. Until registration is complete, you may still receive a paper slip that must be paid separately.

Practical checks include:

Keep the confirmation email, letter, or application number.
Continue opening all utility mail during the transition.
Check your bank or card statement after the expected payment date.
Do not pay the same period twice if an automatic debit is already scheduled; contact the utility if the documents are unclear.

Payment options can change

Digital and counter-payment arrangements are local operating rules, not a single national system. They can also change when a utility changes contractors or supported services.

For example, Osaka City ended acceptance of cheques on February 27, 2026. Its current payment page should be checked for the digital service accepted at the time you pay. This is why an old English blog post or move-in leaflet may no longer be enough.

Before using a smartphone service, confirm all three points on the official page:

The app or service is currently supported.
Your payment slip has a compatible barcode.
The amount is within the service’s payment limit.

Starting and stopping service when you move

Water procedures are usually handled by the local waterworks bureau, not through a nationwide utility company.

Moving into a home

Follow these steps:

Check whether water is already included or managed by the building.
Identify the utility serving the address.
Submit a start request using its website, app, telephone service, or form.
Record the start date and customer number.
Choose a payment method.
Check the first notice for the correct service period.

Yokohama asks customers to contact its Waterworks Bureau Customer Service Center at least three days before starting or cancelling service. Your city may set a different lead time.

Water may physically run before the account is registered. That does not mean it is free or that no procedure is needed.

Moving out

Do not rely only on cancelling rent, electricity, or gas. Submit a separate stop request if the water contract is in your name.

Have these details ready:

Customer number
Current address
Stop date
New address for the final bill
Preferred final-payment method
Contact details

If you forget, billing may continue until the utility processes the cancellation. When leaving Japan, arrange a payment method that remains usable after departure or ask how to settle the final amount.

What to do when the bill suddenly rises

A large increase should be checked promptly. Start with the dates and meter readings, then look for unusual consumption or a leak.

A simple leak check

When no tap, toilet, washing machine, dishwasher, or other water-using appliance is running:

Find the household water meter if you can access it safely.
Note the reading or small leak indicator.
Keep all water off for a short period.
Check whether the reading or indicator moved.

If it moved, contact your landlord, building manager, or an authorized repair business as appropriate. Do not open sealed equipment or enter a restricted meter area.

A constantly running toilet, dripping fixture, or hidden pipe leak can increase both sides of a combined bill because supplied water is often also treated as sewer discharge.

A reduction is not automatic

Some municipalities have relief procedures for qualifying hidden leaks. Yokohama, for example, says that a partial reduction may be available when an underground or in-wall supply-pipe leak meets its criteria.

The rules may require prompt repair, evidence from an approved contractor, and an application. Visible leaks, neglected fixtures, or all of the lost water may not qualify. Keep the bill, photographs, repair invoice, and any certificate provided by the contractor, then ask the utility directly.

Common mistakes to avoid

Most billing problems come from assumptions made during a move or payment change.

Reading a two-month total as a monthly cost: Check the start and end dates.
Looking only at the water line: Sewerage can form a substantial separate part of the total.
Comparing cities without matching conditions: Rates, meter sizes, taxes, and sewerage systems differ.
Assuming low use produces a near-zero bill: Basic or minimum charges may still apply.
Discarding the meter-reading notice: It contains useful readings, dates, and the customer number.
Believing automatic payment starts immediately: Pay any interim slip unless the utility confirms otherwise.
Forgetting to stop service: Water cancellation is generally separate from the rental move-out procedure.
Paying a person at the door without verification: Tokyo warns that meter readers do not collect money on the spot during regular inspections.

If someone asks for immediate cash, card details, or access to your home, pause and call the official number printed on a trusted bill or the utility’s website.

Regional differences matter more than national averages

There is no single household water tariff for all of Japan. Municipalities and regional utilities set their own rates, billing systems, supported payment channels, and relief rules.

Differences can include:

Monthly or two-month billing
Basic, minimum, and progressive rate bands
Charges based partly on meter diameter
Public sewerage, septic systems, or other wastewater arrangements
Discounts or reductions for eligible households
Leak-relief requirements
Languages available through customer support
Digital payment services

Even nearby cities can produce different bills for the same volume. Use national averages only for rough budgeting. For an actual household decision, enter your expected consumption into the official local calculator where one is available.

A practical monthly budgeting method

When bills arrive every two months, convert them into a monthly planning figure.

Use this process:

Take the complete water-and-sewer total.
Confirm how many days the bill covers.
Divide by the number of months represented—usually about two.
Compare usage in m³, not only the yen total.
Keep several bills so you can see seasonal and household changes.

For a new home, ask for the meter size and local tariff before relying on another resident’s bill. Household size, bathing habits, laundry frequency, leaks, and the property’s billing arrangement can all change the result.

What to confirm now

As of August 22, 2026, billing and payment details remain local. Use this checklist whenever you move or receive an unfamiliar charge:

Find the official water authority for your exact address.
Confirm whether public sewerage is included.
Check whether the period is one month or two.
Identify the basic or minimum charge and the usage bands.
Verify that automatic payment is active before discarding a slip.
Report unexplained meter movement or a sudden increase promptly.
Recheck the official payment page because supported apps and counter methods can change.

The most useful number to keep is not a national average. It is your customer number, together with a photo or copy of the latest meter-reading notice. Those two items make it much easier to question a charge, change payment methods, or close the account when you move.

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