Clarkston Public Library · Photo: Ian Poellet · CC BY-SA 4.0Living in Clarkston, WA: what to set up and who to call
Every home in Clarkston is in ZIP code 99403. For home internet, most of Clarkston can choose between Sparklight and First Step Internet.
I’m new in town
What to set up in Clarkston, 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 Clarkston.
Power comes from Avista
Avista (Avista Corp.), an investor-owned utility, serves all of Clarkston. 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 PUD #1 of Asotin County water system
The PUD #1 of Asotin County water system supplies almost all of Clarkston. It draws ground water and serves 21,930 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 latest lead result on file, the 90th percentile of homes sampled in Jan 2021–Dec 2023, was 3.5 ppb, below the 15 ppb action level that applied. That’s higher than 84% 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. WA5393343.
8 home internet providers serve Clarkston
100% of 2,648 addresses can get 100/20 Mbps; 34% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Sparklight | Cable | 100% | 1,000/50 |
| First Step Internet | Fixed wireless, Fiber | 91% | 25/4 |
| Inland Cellular | Fiber, Fixed wireless | 67% | 1,000/1,000 |
| CenturyLink | DSL, Fiber | 61% | 100/10 |
| Intermax Networks | Fiber | 13% | 1,000/1,000 |
| Verizon | Fixed wireless | 54% | 300/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
Trash and recycling in Clarkston
Pickup days, the drop-off and recycling in Clarkston, from the town’s own site.
Sorted recycling
Separate your recyclables by material.
- Newspaper
- Cardboard
- Magazines
- Aluminum and tin cans
We couldn’t find pickup days or drop-off hours. Check clarkston-wa.com →
From clarkston-wa.com, the town’s official site, checked Oct 21, 2026; pages dated 2025-11-03, 2026-08-13. 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.
Clarkston is in Clarkston School District.
CSchool 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 Aug 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 30, 2026.
Clarkston is in ZIP code 99403
ZIP codes where Clarkston residents live, with the share of the town in each.
| ZIP | Post office name | Share of Clarkston | ZIP’s residents in Clarkston |
|---|---|---|---|
| 99403 | Clarkston, WA | 100% | 35% |
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 Clarkston
Who supplies Clarkston’s drinking water, and has it had violations?
The PUD #1 of Asotin County water system (EPA ID WA5393343). It reported no health-based violations to EPA in the five years to October 2026; 83% of systems its size had none. Its latest lead 90th percentile was 3.5 ppb (Jan 2021–Dec 2023), against a 15 ppb action level.
Who provides electricity in Clarkston?
Avista (Avista Corp.), an investor-owned utility. Its homes paid about 14.2¢ per kWh in 2025 (EIA).
What internet providers serve Clarkston?
Sparklight, First Step Internet, Inland Cellular, CenturyLink, Intermax Networks, Verizon (FCC, as of December 2025).
What ZIP codes are in Clarkston?
99403. Census 2020 ZIP Code Tabulation Areas.
What school district is Clarkston in?
Clarkston School District.
How do I register to vote in Clarkston?
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 Asotin 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: Clarkston’s own website (clarkston-wa.com), 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.