FAQs

If you think your billing is incorrect or suspect that you may have a leak, please call the Utility Billing office at 206-275-7602. All disputes must be submitted in writing to the Utility Billing Department at 9611 SE 36th St, Mercer Island, WA 98040.

A due date is printed on each invoice, typically 20 days from the invoice date. The utility bill is considered past due (late) if payment has not been received by the due date shown on the bill. Options for making a payment include payment online, in-person, pay by phone at 855-844-0085 or by check in the drop box in the City Hall parking lot.

Mail your payment in the return envelope provided and be sure to include the “Return” portion of the bill and the account number on the check to ensure proper credit to your account. Payment may be made in person at the Finance Counter at City Hall, 9611 SE 36th St, Mercer Island, WA 98040. Please pay by check or money order made payable to “City of Mercer Island.” 

Notification from the sellers Escrow company in writing is required to transfer ownership of the property. If Escrow is not withholding funds to pay for all current and final utility charges, the seller is required to notify Utility Billing at 206-275-7602 and provide a forwarding address.

The city is not able to facilitate seller/buyer rent-backs. The exact date of closing is required to accurately and efficiently transfer utility accounts in the case of a property sale.

The property owner or property manager working on behalf of the owner must authorize all billing information or name changes.   As a courtesy, tenants are encouraged to call and request a final utility quote over the phone at 206-275-7602. City staff are unable to generate a physical invoice out of cycle for a tenant close out billing. As a result, the tenant is quoted a final estimate either over the phone or email and the quote is noted in the billing account. If the tenant does not pay, the owner remains responsible. 

Water meters are City of Mercer Island assets. If you turn off the meter on your own and cause damage, you may be held liable for the cost of resulting damages. Contact the City of Mercer Island’s Public Works department at 206-275-7608, if you need your water shut off to do repairs. Alternatively, contact the City of Mercer Island’s Utility Billing department at 206-275- 7602, if you need your water shut off for seasonal disconnect.

Please call our Public Works department at 206-275-7608 or fill out a service request.

Water is delivered to Mercer Island by Seattle Public Utilities via 16" and 24" water supply lines. The region’s fresh water supply comes primarily from two sources: The Cedar River Watershed and the Tolt River Watershed, both located in eastern King County. Click here for additional information on the Water Utility.

Registration is not required for one time payments. However, by registering you will be able to view prior history, set up automatic payments, and store payment information (note: payment information is only stored for property owners). 

You can pay with credit card, debit card, or you may issue an electronic check from your bank account (checking or savings).  American Express and gift cards with the Mastercard or Visa logo are not accepted.

Yes, you may use one payment method for part of the transaction and another payment method for other parts of the transaction.

AutoPay is a convenient option in which bills will be paid automatically each billing cycle on their due dates using your default credit card or bank account information. This will avoid late fees and having to remember when to pay. Login to your account and click on AutoPay to enroll.

Once your account is registered, go to the “My Profile” menu and select “Payment Methods.” Enter your preferred payment method, select the Default box, and click save. Go to the AutoPay section, choose your payment method, and click save. You will receive a confirmation email and must click the link in that email to complete the AutoPay set up.

Scheduled payments are individual payments that are scheduled for a specific date and amount prior to the bill due date. The date of a scheduled payment can be changed if it is adjusted before the date scheduled.

Customers can link multiple utility accounts and view and pay all your open bills with a single transaction. When registering bills under the same email address, you are given the option to link the related account within the service.

Multiple first email notifications scheduled for the same day, including for different bill types, are grouped into one email rather than sent separately. Payment receipts are sent individually. Editing account information such as changing an email or password will go across all linked accounts, however, changing settings such as AutoPay or paperless is only for the accessed account.