Photo: Judith Arsenault · CC BY-SA 2.0Living in Mountainaire, AZ: what to set up and who to call
Ponderosa Utility Corp reported 3 health-based violations to EPA in the last five years: a groundwater treatment requirement (Groundwater Rule) ×2, a bacteria testing requirement (Revised Total Coliform Rule). 78% of systems its size reported none. Mountainaire has no town government of its own, so Coconino County runs its elections and most services, and its children attend Flagstaff Unified District.
I’m new in town
What to set up in Mountainaire, 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 Mountainaire.
Power comes from APS
APS (Arizona Public Service Co.), an investor-owned utility, serves all of Mountainaire. 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 Ponderosa Utility Corp
Ponderosa Utility Corp supplies Mountainaire: about 97% of residents live in its service area. About 3% 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 1,585 people in all.
3 health-based violations reported to EPA in the five years to October 2026: a groundwater treatment requirement (Groundwater Rule) ×2, a bacteria testing requirement (Revised Total Coliform Rule), the latest beginning Jul 2024. 78% of the 7,966 systems serving 1,001–3,300 people had none.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2023–Dec 2025, 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. AZ0403018.
4 home internet providers serve Mountainaire
89% of 686 addresses can get 100/20 Mbps; 0% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Optimum | Cable | 85% | 940/35 |
| CenturyLink | DSL | 3% | 10/1 |
| Verizon | Fixed wireless | 23% | 300/20 |
| T-Mobile | Fixed wireless | 5% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Mountainaire’s trash rules yet
Pickup rules, the dump and recycling in Mountainaire.
Where your child goes to school
Public school districts and the school path by grade.
Mountainaire is in Flagstaff Unified District.
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
Mountainaire is unincorporated, so Coconino 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.
Mountainaire is in ZIP code 86005
ZIP codes where Mountainaire residents live, with the share of the town in each.
| ZIP | Post office name | Share of Mountainaire | ZIP’s residents in Mountainaire |
|---|---|---|---|
| 86005 | Flagstaff, AZ | 100% | 7% |
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 Mountainaire
Who supplies Mountainaire’s drinking water, and has it had violations?
Ponderosa Utility Corp (EPA ID AZ0403018). It reported 3 health-based violations to EPA in the five years to October 2026: a groundwater treatment requirement (Groundwater Rule) ×2, a bacteria testing requirement (Revised Total Coliform Rule). 78% of systems its size had none. Its latest lead 90th percentile was 0.0 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in Mountainaire?
APS (Arizona Public Service Co.), an investor-owned utility. Its homes paid about 17.0¢ per kWh in 2025 (EIA).
What internet providers serve Mountainaire?
Optimum, CenturyLink, Verizon, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Mountainaire?
86005. Census 2020 ZIP Code Tabulation Areas.
What school district is Mountainaire in?
Flagstaff Unified District.
How do I register to vote in Mountainaire?
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 Coconino 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.