Living in Castle Rock, WA: what to set up and who to call
Castle Rock Municipal Water has a clean five-year EPA record, but its latest lead result, 5.0 ppb, was higher than 91% of similar systems’ (the action level is 15). Power in Castle Rock comes from PUD No 1 of Cowlitz County, a political subdivision utility rather than a private company.
I’m new in town
What to set up in Castle Rock, 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 Castle Rock.
Power comes from PUD No 1 of Cowlitz County
PUD No 1 of Cowlitz County (PUD No 1 of Cowlitz County), a political subdivision utility, serves all of Castle Rock. Its homes paid an average of 9.2¢ per kWh in 2025, about $120 a month (its average across Washington).
Start or move service: cowlitzpud.org · (360) 423-2210
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Castle Rock Municipal Water
Castle Rock Municipal Water supplies almost all of Castle Rock. It draws surface water and serves 4,367 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 80% of the 5,012 systems serving 3,301–10,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2022–Dec 2024, was 5.0 ppb, below the 15 ppb action level that applied. That’s higher than 91% 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. WA5311800.
7 home internet providers serve Castle Rock
98% of 950 addresses can get 100/20 Mbps; 9% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable | 98% | 2,000/250 |
| Astound Broadband | Fixed wireless, DSL, Fiber | 97% | 1,000/250 |
| CenturyLink | DSL | 23% | 10/1 |
| Hawk Networks | Fixed wireless | 99% | 150/35 |
| AT&T | Fixed wireless | 82% | 25/3 |
| Verizon | Fixed wireless | 10% | 300/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Castle Rock’s trash rules yet
Pickup rules, the dump and recycling in Castle Rock.
Where your child goes to school
Public school districts and the school path by grade.
Castle Rock is in Castle Rock School District.
C−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 Aug 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 30, 2026.
Castle Rock is in ZIP code 98611
ZIP codes where Castle Rock residents live, with the share of the town in each.
| ZIP | Post office name | Share of Castle Rock | ZIP’s residents in Castle Rock |
|---|---|---|---|
| 98611 | Castle Rock, WA | 100% | 24% |
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 Castle Rock
Who supplies Castle Rock’s drinking water, and has it had violations?
Castle Rock Municipal Water (EPA ID WA5311800). It reported no health-based violations to EPA in the five years to October 2026; 80% of systems its size had none. Its latest lead 90th percentile was 5.0 ppb (Jan 2022–Dec 2024), against a 15 ppb action level.
Who provides electricity in Castle Rock?
PUD No 1 of Cowlitz County (PUD No 1 of Cowlitz County), a political subdivision utility. Its homes paid about 9.2¢ per kWh in 2025 (EIA).
What internet providers serve Castle Rock?
Xfinity, Astound Broadband, CenturyLink, Hawk Networks, AT&T, Verizon (FCC, as of December 2025).
What ZIP codes are in Castle Rock?
98611. Census 2020 ZIP Code Tabulation Areas.
What school district is Castle Rock in?
Castle Rock School District.
How do I register to vote in Castle Rock?
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 Cowlitz 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.