Photo: Mccunicano · CC BY-SA 4.0Living in Brinnon, WA: what to set up and who to call
Brinnon has no town government of its own, so Jefferson County runs its elections and most services, and its children attend Brinnon School District. Power in Brinnon comes from PUD No 1 of Mason County, a political subdivision utility rather than a private company.
I’m new in town
What to set up in Brinnon, 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 Brinnon.
Power comes from PUD No 1 of Mason County
PUD No 1 of Mason County (PUD No 1 of Mason County), a political subdivision utility, serves all of Brinnon.
Start or move service: mason.pud1.org · (360) 877-5249
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Seamount Estates Community water system
The Seamount Estates Community water system supplies Brinnon: about 10% of residents live in its service area. Pleasant Tides Water Co Op serves another 8%. Triton Cove serves another 7%. About 75% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws ground water and serves 92 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 11,392 systems serving <=100 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2023–Dec 2025, was 1.6 ppb, below the 15 ppb action level that applied. The highest in five years was 11.0 ppb. That’s higher than 67% of similar systems’ latest results.
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. WA5376986.
5 home internet providers serve Brinnon
94% of 1,114 addresses can get 100/20 Mbps; 94% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Hood Canal Communications | Fiber | 95% | 1,000/1,000 |
| CenturyLink | DSL | 10% | 40/3 |
| T-Mobile | Fixed wireless | 14% | 100/20 |
| Verizon | Fixed wireless | 7% | 25/6 |
| AT&T | Fixed wireless | 6% | 25/3 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Brinnon’s trash rules yet
Pickup rules, the dump and recycling in Brinnon.
Where your child goes to school
Public school districts and the school path by grade.
Brinnon is in Brinnon School District.
Test scores and every school: see Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
No town hall: the county runs things
Brinnon is unincorporated, so Jefferson County is the local government.
Election office: FVAP local election office directory, updated Sep 2017; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 30, 2026.
Brinnon is in ZIP code 98320
ZIP codes where Brinnon residents live, with the share of the town in each.
| ZIP | Post office name | Share of Brinnon | ZIP’s residents in Brinnon |
|---|---|---|---|
| 98320 | Brinnon, WA | 100% | 68% |
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 Brinnon
Who supplies Brinnon’s drinking water, and has it had violations?
The Seamount Estates Community water system (EPA ID WA5376986). It reported no health-based violations to EPA in the five years to October 2026; 78% of systems its size had none. Its latest lead 90th percentile was 1.6 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in Brinnon?
PUD No 1 of Mason County (PUD No 1 of Mason County), a political subdivision utility.
What internet providers serve Brinnon?
Hood Canal Communications, CenturyLink, T-Mobile, Verizon, AT&T (FCC, as of December 2025).
What ZIP codes are in Brinnon?
98320. Census 2020 ZIP Code Tabulation Areas.
What school district is Brinnon in?
Brinnon School District.
How do I register to vote in Brinnon?
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 Jefferson County Auditor. 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: OpenStreetMap, Geofabrik extract of Oct 9, 2026. © OpenStreetMap contributors (ODbL).
- 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.