Photo: Andrew Filer (In memoriam afiler) · CC BY-SA 2.0Living in Rosalia, WA: what to set up and who to call
Every home in Rosalia is in ZIP code 99170. The nearest emergency room is Whitman Hospital and Medical Center, 25.3 miles away.
I’m new in town
What to set up in Rosalia, 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 Rosalia.
Power comes from Avista
Avista (Avista Corp.), an investor-owned utility, serves all of Rosalia. Its homes paid an average of 14.2¢ per kWh in 2025, about $130 a month (its average across Washington).
Start or move service: avistacorp.com · (509) 489-0500
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Town of Rosalia water system
The Town of Rosalia water system supplies almost all of Rosalia. It draws ground water and serves 831 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 5,327 systems serving 501–1,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2021–Dec 2023, was 3.8 ppb, below the 15 ppb action level that applied. That’s higher than 87% 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. WA5374250.
5 home internet providers serve Rosalia
86% of 324 addresses can get 100/20 Mbps; 76% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Ziply Fiber | Fiber, Fixed wireless | 88% | 6,000/6,000 |
| First Step Internet | Fixed wireless, Fiber | 80% | 25/4 |
| AT&T | Fixed wireless | 73% | 25/3 |
| T-Mobile | Fixed wireless | 65% | 100/20 |
| Hughes Computer Services | Fixed wireless | 2% | 50/10 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Rosalia’s trash rules yet
Pickup rules, the dump and recycling in Rosalia.
Where your child goes to school
Public school districts and the school path by grade.
Rosalia is in Rosalia 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.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Sep 2024; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 30, 2026.
Rosalia is in ZIP code 99170
ZIP codes where Rosalia residents live, with the share of the town in each.
| ZIP | Post office name | Share of Rosalia | ZIP’s residents in Rosalia |
|---|---|---|---|
| 99170 | Rosalia, WA | 100% | 53% |
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 Rosalia
Who supplies Rosalia’s drinking water, and has it had violations?
The Town of Rosalia water system (EPA ID WA5374250). 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 3.8 ppb (Jan 2021–Dec 2023), against a 15 ppb action level.
Who provides electricity in Rosalia?
Avista (Avista Corp.), an investor-owned utility. Its homes paid about 14.2¢ per kWh in 2025 (EIA).
What internet providers serve Rosalia?
Ziply Fiber, First Step Internet, AT&T, T-Mobile, Hughes Computer Services (FCC, as of December 2025).
What ZIP codes are in Rosalia?
99170. Census 2020 ZIP Code Tabulation Areas.
What school district is Rosalia in?
Rosalia School District.
How do I register to vote in Rosalia?
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 Whitman 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.