Your customer number is the 10-digit number shown on your meter reading slip and other water service documents. Please have your meter reading slip or other relevant document ready and check the number highlighted in red.

[If you did not receive the verification code by email]
If you have enabled email filtering or spam-blocking settings, please make sure that emails from info@tokyo.suidoapp.jp are allowed. If you are using a mobile carrier email address (such as Docomo, au, or SoftBank) and are unable to receive the verification email, please try using a free email service, such as Gmail or Yahoo Mail.
[If you did not receive the verification code by SMS]
If you use the web version of the Tokyo Water App, you can receive the verification code by voice call (to your phone number) instead of SMS (Short Message Service).
Click here to access the web version of the Tokyo Water App.
When registering through the web version, select "Voice" instead of "SMS" on the "Verification code delivery method" screen.

[E021-003]
This error may occur if the selected payment method is incorrect, or the last four digits of the bank account number or credit card number you entered do not match the information registered with the Bureau of Waterworks.
*The Customer Center cannot provide information about your registered payment method or your bank account or credit card number. However, if you contact us as the contract holder, we can confirm whether the number you provide matches our registered records.
If you use Japan Post Bank, please enter the last four digits of the account number shown in your passbook.
[E021－008]
This error occurs because no telephone number is registered with the Bureau of Waterworks for your account. Please contact the Customer Center to register your telephone number.
Please note that it may take some time for updated information to be reflected in the Tokyo Water App. You will be able to complete a new registration or add a customer number from 8:00 a.m. on the next business day (excluding Sundays and public holidays) after contacting the Customer Center.
[E021－009]
This error occurs because the telephone number you entered does not match the telephone number registered with the Bureau of Waterworks. Please check your telephone number and try again. If you are unsure which telephone number is registered, please contact the Customer Center.
[E025－002]
This error is displayed when there is information regarding your registration that requires confirmation. We apologize for the inconvenience, but please contact the Customer Center by phone.
*This error may also appear if you already have a water service contract but selected "First-time users" and proceeded through "Apply to start water service." If you already have a water service contract, please proceed through "Register your existing water service."

On the login screen, enter the email address and password you registered during your previous attempt, then click "Log In." You will be able to resume the registration process from where you left off.

After logging in to the app, you can update your email address from "User information" in the "Menu."
Please log in using the email address currently registered with the App.
Once you have updated your registered email address, be sure to use your new email address the next time you log in.

It may take several business days for your water usage and billing information to be reflected in the App. Please check again after a few days.

You can modify or cancel your application from "Review, modify, or cancel applications" in the "Menu." (An application can be modified or canceled only once.) If you need to make additional changes or cancellations, or if you need to change the service address or the name of the account holder, please contact the Customer Center.

If you applied to start water service by phone or through another method, your new water service contract information will not be added to the App automatically. Please register the new water service contract in the App yourself.
From "Register/add your current water service" in the "Menu," select "Add customer number" and register the customer number for your new water service contract. Once the registration is complete, the information will be displayed in the App.
*Your customer number for your new address is different from the one for your previous address. You can find your new customer number on the meter reading slip delivered to your new address.

Go to "Register/add your current water service" in the "Menu" and change the water service contract displayed on the screen (the primary customer number).

Yes. If the water service contract was registered in the App before you applied to stop the service, you can continue to view its information in the App even after the service has been terminated.
Please note that water service contracts that have already been closed cannot be newly registered in the App.

Tap "Usage details" under "Usage history" to view your "Water usage statement" (meter reading slip).
You can view meter reading slips issued after you registered for the App for up to two years. They are also available for download as a PDF or CSV file.

We apologize, but the App only allows you to view meter reading slips issued after you registered for the App.
For information from before you registered, you can view your water usage and charge history for the past two years by selecting "Past usage history" under "Usage history."

We apologize, but bulk downloading of PDF or CSV files is not available. Please download each meter reading slip individually for each water service contract and billing month.

Yes. From "Payment procedures" in the "Menu," select "Change delivery method" and choose "Paper." You will then receive paper meter reading slips in addition to electronic delivery through the App.
Please note that, depending on the timing of your request, you may receive only the electronic version for one billing cycle before paper meter reading slips begin to be delivered.

We apologize, but charges billed before you registered for the App cannot be paid through the App. Please use the paper bill you received to make your payment.

No. Receipts are not issued for payments made using bills delivered through the App.
If you pay your water charges by direct debit, you will receive a "Direct Debit Payment Notice," which serves as a substitute for a receipt. If you require proof of payment, please log in to the App and apply for direct debit from "Direct debit application/change" under "Payment procedures."

You can confirm whether your application was successfully received in the email with the subject "Web Direct Debit Application Service – Application Receipt Notification."
Once your registration has been completed, you will also receive a notification with the subject "Direct Debit Registration Complete." You can view this notification in the App under the "Notifications" menu.

When your application is received, you will be sent a notification with the subject "Recurring Credit Card Payment Application." You can view this notification in the App under "Notifications" menu.

Please try using a different web browser (for example, switch from Microsoft Edge to Google Chrome) or a different network connection (for example, switch from Wi-Fi to your mobile data connection).

Direct debit and credit card payment cannot be canceled through the App. We apologize for the inconvenience, but please contact the Customer Center for assistance.

You can check your current payment method under "Payment" on the "Pay" screen. If you pay by direct debit, "Your current payment method is Direct debit." will be displayed. If you pay by credit card, "Your current payment method is Credit card." will be displayed.
If you pay by paper bill, an electronic bill will be displayed on this screen whenever a new bill is issued.

After logging in to the App, go to "Settings" in the "Menu" and clear the checkbox for the notifications you no longer wish to receive.
Please note that important notifications, such as billing notifications, will continue to be sent regardless of your notification settings.
If you no longer use the App, because, for example, you have moved outside the Tokyo metropolitan area, please cancel your App membership. After logging in, go to "Settings" in the "Menu" and select "Cancel membership."
Once your membership is canceled, App notifications will no longer be sent.
Please note that canceling your membership will permanently delete the information registered in the App. As a result, you will no longer be able to view your meter reading data, including your water usage and charges.

Applying to stop your water service does not automatically cancel your membership.
To cancel your membership, log in to the App, go to "Settings" in the "Menu" and select "Cancel membership."
Please note that canceling your membership will permanently delete the information registered in the App. As a result, you will no longer be able to view your meter reading data, including your water usage and billing information.

No special steps are required. Simply install the App on your new device and log in using the email address and password to your account to continue using the service.

The Tokyo Water App undergoes scheduled maintenance on a regular basis. We apologize for the inconvenience and ask that you please try again.
If the "Under Maintenance" screen continues to appear after some time, please try the following:
If you are using the smartphone app: close the App completely, then reopen it.
If you are using the web version on a PC or other device: clear your web browser's browsing history and cache, then try again.