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New Utility Billing Portal! The City of Mercer Island is pleased to announce that the Utility Billing Portal is now live. Using your account number, create an account login on the new site – then dive in! You can track hourly water use, set up leak alerts and notifications, and pay your bill online. You can access the new portal by clicking the ‘Utility Payment’ button above or by visiting http://www.mercerisland.gov/utilityportal.

Utility Billing Manual. On May 6, 2025, the Mercer Island City Council adopted a new Utility Billing Manual. The new manual includes billing information and guidelines in one place with clear expectations, resources, and billing practices for customers. To read the manual and find other utility billing resources, visit the City’s website at www.mercerisland.gov/finance.

Pay by Phone is available for Utility Bills. Make a payment by phone (using credit card or e-check) or check your account balance ANY time with our automated phone service. To access, call (855) 844-0085 – please have your account number ready!

Pay online

Fast and easy

No registration is required for "One Time Pay." The fastest way to pay online and confirm payment.

Safe and secure

Your information is kept confidential, secure, and backed by the highest security standards.

Eco-friendly

Paying online reduces paper use and is an easy way to help the environment.

Important: To ensure compliance with the latest security standards, Invoice Cloud will disable access for Internet browsers which do not support Transport Layer Security (TLS) versions 1.1 and 1.2 beginning April 4, 2018. To continue using online payments, customers must access the service with a compatible browser after that date. If your operating system is Windows XP or Vista, the Internet Explorer browser is no longer compatible with TLS 1.1 or 1.2. Both Firefox and Chrome are compatible browsers.

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