Living in Williamson, AZ: what to set up and who to call
Williamson has no town government of its own, so Yavapai County runs its elections and most services, and its children attend Prescott Unified District. The nearest library is Chino Valley Public Library, 5.9 miles away.
I’m new in town
What to set up in Williamson, 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 Williamson.
Power comes from APS
APS (Arizona Public Service Co.), an investor-owned utility, serves all of Williamson. Its homes paid an average of 17.0¢ per kWh in 2025, about $165 a month (its average across Arizona).
Start or move service: aps.com
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Granite Oaks Water Users Association
Granite Oaks Water Users Association supplies Williamson: about 20% of residents live in its service area. Inscription Canyon Water Company serves another 12%. Inscription Canyon Water Company serves another 12%. Granite Mountain Water Company serves another 11%. City of Prescott serves another 7%. American Ranch Dwid serves another 6%. About 34% 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 1,200 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 7,966 systems serving 1,001–3,300 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2019–Dec 2021, was 0.0 ppb, below the 15 ppb action level that applied. Results below detection are reported as 0, so 0 doesn’t mean no lead at any tap.
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. AZ0413155.
9 home internet providers serve Williamson
96% of 3,666 addresses can get 100/20 Mbps; 4% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Sparklight | Cable, Fiber | 75% | 1,000/50 |
| CenturyLink | DSL | 26% | 60/5 |
| Table Top Telephone | Fiber, DSL | 7% | 1,000/1,000 |
| Bolt Internet | Fixed wireless | 89% | 50/10 |
| Mile High Networks | Fixed wireless | 66% | 1,000/1,000 |
| T-Mobile | Fixed wireless | 34% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Williamson’s trash rules yet
Pickup rules, the dump and recycling in Williamson.
Where your child goes to school
Public school districts and the school path by grade.
Most of Williamson (69%) is in Prescott Unified District; parts are in Chino Valley Unified District (25%) and Williamson Valley Elementary School District (6%).
BSchool gradeSee 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
Williamson is unincorporated, so Yavapai County is the local government.
Election office: FVAP local election office directory, updated Sep 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 12, 2025.
Williamson spans 2 ZIP codes
ZIP codes where Williamson residents live, with the share of the town in each.
| ZIP | Post office name | Share of Williamson | ZIP’s residents in Williamson |
|---|---|---|---|
| 86305 | Prescott, AZ | 94% | 30% |
| 86323 | Chino Valley, AZ | 6% | 2% |
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 Williamson
Who supplies Williamson’s drinking water, and has it had violations?
Granite Oaks Water Users Association (EPA ID AZ0413155). 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 0.0 ppb (Jan 2019–Dec 2021), against a 15 ppb action level.
Who provides electricity in Williamson?
APS (Arizona Public Service Co.), an investor-owned utility. Its homes paid about 17.0¢ per kWh in 2025 (EIA).
What internet providers serve Williamson?
Sparklight, CenturyLink, Table Top Telephone, Bolt Internet, Mile High Networks, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Williamson?
86305 (94%), 86323 (6%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Williamson in?
Prescott Unified District. Parts of the city are in Chino Valley Unified District and Williamson Valley Elementary School District.
How do I register to vote in Williamson?
In Arizona you can register online until 29 days before Election Day, in person until 29 days before Election Day, or by mail (postmarked 29 days before). Elections here are run by the Yavapai County Recorder. Check your registration at my.arizona.vote.
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 12, 2025 (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.