City of Mercer Island Water Utility
Mercer Island
Population reference
31,057 people (EPA SDWA queue estimate for WA5353640)
Billing detail
Limited public detail found
Official destination
Open provider website ↗Provider-specific findings
Billing and account research from public material
Provider-specific research notes are displayed separately from fields that contain only an unavailable-information marker. Read qualifiers in each note and verify current account terms with the provider.
- Billing frequency
- Bi-monthly for metered City water; seasonal peak/off-peak rates apply.
- Rate structure
- 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.
Context, not a score
How documentation coverage compares
This profile
29%
overview fields with research notes
Washington
51%
records with any overview detail
National index
50%
records with any overview detail
Coverage measures what this directory documented. It does not measure service quality, affordability, or regulatory compliance.
Research record
Limited public detail found
2 of 7 fields in this section contain provider-specific public detail in dataset August 1, 2026.
Documented
29%
Details not confirmed in the reviewed public material
- Residential cost reference
- Wastewater and sewer calculation
- Meter reading
- New-account deposit
- Activation or transfer fee
“Not confirmed” means the directory did not identify a dependable public statement. It does not mean the provider has no policy or option.
Primary verification routes
- City of Mercer Island Water Utility public website ↗
Provider-controlled destination used to confirm current customer instructions.
- EPA SDWIS / ECHO lookup (WA5353640) ↗
Search the federal drinking-water database using public water system ID WA5353640.