Utility Services

Water

 


Pay your utility bill online. 

The City of Mercer Island provides essential utility services to its residents and businesses. The Finance Department handles customer accounts and utility billing for these services. Refer to the Utility Billing Manual for billing information and guidelines that outline clear expectations, resources, and billing practices for customers.

If you have questions, contact the Utility Billing Team at 206-275-7602, Monday through Friday, 8:30 AM to 4:30 PM. For reporting problems outside of regular business hours, call the non-emergency police number at 425-577-5656.

The primary utility services provided directly by the City of Mercer Island include:

Drinking Water: The City provides drinking water, with charges based on meter size and water consumption. A fixed meter charge covers maintenance and customer service, while consumption is measured bi-monthly. The water supply originates from regional watersheds like the Cedar River and Tolt River.

Sewer: Sewer charges comprise a treatment fee set by King County Wastewater Treatment (which the City contracts with for waste transportation and treatment) and a local rate based on water usage. For single-family customers, the King County portion is fixed, while the local portion is based on average winter water use. Multi-family and commercial customers pay based on actual consumption for both.

Storm and Surface Water: Fees for storm and surface water cover the costs of managing runoff, maintaining and improving the public drainage system, and protecting water quality in Lake Washington. These charges are based on property size and the amount of impervious surface (e.g., roofs, driveways) on the property.

Emergency Medical Services (EMS): Utility customers pay a fixed fee that helps fund emergency medical services on Mercer Island.

 
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