Municipal Department
City of Mercer Island Water Utility
Serving Mercer Island
Population served
31,057 people (EPA SDWA queue estimate for WA5353640)
State system code
FIPS 53
Billing frequency
Bi-monthly for metered City water; seasonal peak/off-peak rates apply.
Provider briefing
How this utility’s billing works
City of Mercer Island Water Utility operates as a municipal department serving Mercer Island. Customers should use the provider’s current account-specific bill and official customer-service instructions as the final authority for deadlines, balances, and service requests.
The published water-rate framework is described as Seasonal and increasing block water rates. 2026 rates distinguish off-peak and peak periods, with peak blocks up to 5 CCF, next 13 CCF, and over 18 CCF plus base service charges by meter size.. Bills are generated bi-monthly for metered city water; seasonal peak/off-peak rates apply., and a typical residential cost reference is A dedicated this detail was not publicly posted. The 2026 fee schedule varies by meter and season and the reviewed source did not establish a representative complete water/sewer bill.. These descriptions are useful planning benchmarks; actual charges can change with meter size, usage, sewer averaging, local taxes, drought stages, or account-specific fees.
Wastewater and sewer calculation
A dedicated this detail was not publicly posted. The reviewed water-utility page did not expose the current sewer formula.
Meter and infrastructure notes
A dedicated this detail was not publicly posted. The reviewed rate source did not identify the meter technology or route schedule.
Emergency water support
Report a leak or water emergency
No current this detail was publicly posted in the reviewed provider materials. Confirm the current instruction directly with the official utility.
Official starting point
Choose the right next step
Reading this profile
A practical reference for Mercer Island
City of Mercer Island Water Utility is listed here as a municipal department. The profile separates account actions—such as paying a bill or requesting service—from explanatory material about rates, meters, wastewater, leaks, and delinquency.
Because utility rules can vary by account class, meter size, service address, billing date, and local ordinance, treat the published bill and current provider website as the final authority. Use this profile to locate the correct channel and prepare better questions for customer service.
If your issue is urgent, start with the provider’s emergency number or official payment route rather than waiting for an email response. Keep a written record of calls, confirmation numbers, notice dates, and documents you submit.