Photo: Dllu · CC BY-SA 4.0Living in Mercer Island, WA: what to set up and who to call
The closest public drop-off to Mercer Island is Factoria Recycling & Transfer Station, 3 miles out; the town decides whether residents may use it. Most of Mercer Island has one wired internet choice: Xfinity.
I’m new in town
What to set up in Mercer Island, and who provides it. Tap an answer for the details and where they come from.
Power, water and internet
Who to call to start service at a new address in Mercer Island.
Power comes from Puget Sound Energy
Puget Sound Energy (Puget Sound Energy Inc), an investor-owned utility, serves all of Mercer Island. Its homes paid an average of 17.0¢ per kWh in 2025, about $147 a month (its average across Washington).
Start or move service: pse.com · (888) 225-5773
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from City of Mercer Island water system
The City of Mercer Island water system supplies almost all of Mercer Island. It buys treated surface water (EPA lists Seattle Public Utilities as seller) and serves 31,057 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 83% of the 3,525 systems serving 10,001–50,000 people.
The system’s full record: EPA ECHO report
EPA SDWIS via Envirofacts (violations pulled Oct 9, 2026) and ECHO (lead samples, 2026Q3); service area: EPA Community Water System Service Area Boundaries v3.0. Violations are counted by the start of their compliance period. WA5353640.
6 home internet providers serve Mercer Island
100% of 7,505 addresses can get 100/20 Mbps; 34% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable, Fiber | 100% | 2,000/2,000 |
| Quantum Fiber | Fiber | 34% | 2,000/1,000 |
| CenturyLink | DSL, Fiber | 10% | 940/940 |
| AT&T | Fixed wireless | 51% | 100/20 |
| Verizon | Fixed wireless | 44% | 300/20 |
| T-Mobile | Fixed wireless | 36% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
Trash day in Mercer Island depends on your street
Pickup days, the drop-off and recycling in Mercer Island, from the town’s own site.
Your pickup week
- TrashEvery week, on your street’s dayLook up your day on mercerisland.gov
- RecyclingEvery other weekCheck which week on mercerisland.gov →
From mercerisland.gov, the town’s official site, checked Oct 21, 2026. Rules change: the town’s page is the last word. .
Where your child goes to school
Public school districts and the school path by grade.
Mercer Island is in Mercer Island School District.
A+School gradeSee Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Sep 2021; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 30, 2026.
Mercer Island is in ZIP code 98040
ZIP codes where Mercer Island residents live, with the share of the town in each.
| ZIP | Post office name | Share of Mercer Island | ZIP’s residents in Mercer Island |
|---|---|---|---|
| 98040 | Mercer Island, WA | 100% | 100% |
Census 2020 ZIP Code Tabulation Areas, by census block; post office names: GeoNames (CC BY 4.0). ZIPs created since 2020 are missing.
Getting around, the ER and the library
One line each; the subject pages have the rest.
ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.
Questions about living in Mercer Island
Who supplies Mercer Island’s drinking water, and has it had violations?
The City of Mercer Island water system (EPA ID WA5353640). It reported no health-based violations to EPA in the five years to October 2026; 83% of systems its size had none.
Who provides electricity in Mercer Island?
Puget Sound Energy (Puget Sound Energy Inc), an investor-owned utility. Its homes paid about 17.0¢ per kWh in 2025 (EIA).
What internet providers serve Mercer Island?
Xfinity, Quantum Fiber, CenturyLink, AT&T, Verizon, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Mercer Island?
98040. Census 2020 ZIP Code Tabulation Areas.
What school district is Mercer Island in?
Mercer Island School District.
How do I register to vote in Mercer Island?
In Washington you can register online until 8 days before Election Day, in person up to and including Election Day, or by mail (received 8 days before). Elections here are run by the King County Elections. Check your registration at voter.votewa.gov.
Sources & dates
Every answer above names its source. Here they are with their dates.
- Water: EPA SDWIS (Envirofacts, pulled Oct 9, 2026), ECHO SDWA 2026Q3, EPA CWS Service Area Boundaries v3.0.
- Power: HIFLD Electric Retail Service Territories (map Aug 2023); EIA-861 final 2025.
- Trash: Mercer Island’s own website (mercerisland.gov), read Oct 21, 2026, pickup and drop-off facts extracted and checked against the page they came from.
- ZIP codes: Census 2020 ZCTA relationship files; GeoNames postal codes (CC BY 4.0).
- Schools: NCES Common Core of Data, 2024–25.
- Registration: vote.gov, updated Sep 30, 2026 (read Oct 10, 2026). Official sites and area codes: Wikidata.
- Election office: FVAP local election office directory (fetched Oct 10, 2026; each record dated), EAC EAVS 2024 jurisdictions; registration and lookup links from vote.gov’s state data, checked Oct 10, 2026.
- Internet: FCC National Broadband Map, as of December 2025.