Photo: $1LENCE D00600D · CC BY-SA 3.0Living in Summit, AZ: what to set up and who to call
Summit has no town government of its own, so Pima County runs its elections and most services, and its children attend Sunnyside Unified District. Summit Water Coop has a clean five-year EPA record, but its latest lead result, 7.0 ppb, was higher than 94% of similar systems’ (the action level is 15).
I’m new in town
What to set up in Summit, 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 Summit.
Power comes from Tucson Electric Power
Tucson Electric Power (Tucson Electric Power Co), an investor-owned utility, serves all of Summit. Its homes paid an average of 14.9¢ per kWh in 2025, about $117 a month (its average across Arizona).
Start or move service: uns.com
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Summit Water Coop
Summit Water Coop supplies Summit: about 28% of residents live in its service area. La Casita Water Company 1 serves another 16%. La Casita Water Company 2 serves another 16%. La Casita Water Company 3 serves another 16%. Lazy Acres MHP serves another 6%. About 43% 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 53 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 11,392 systems serving <=100 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2023–Dec 2025, was 7.0 ppb, below the 15 ppb action level that applied. The highest in five years was 10.0 ppb. That’s higher than 94% 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 (EPA’s estimate). Violations are counted by the start of their compliance period. AZ0420595.
6 home internet providers serve Summit
98% of 1,542 addresses can get 100/20 Mbps; 72% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Cox Communications | Fiber, Fixed wireless, Cable | 95% | 2,000/35 |
| CenturyLink | DSL | 37% | 80/10 |
| Verizon | Fixed wireless | 78% | 300/20 |
| T-Mobile | Fixed wireless | 54% | 100/20 |
| Simply Bits | Fixed wireless | 5% | 100/30 |
| Bluespan Wireless | Fixed wireless | 5% | 350/35 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Summit’s trash rules yet
Pickup rules, the dump and recycling in Summit.
Where your child goes to school
Public school districts and the school path by grade.
Summit is in Sunnyside Unified District.
CSchool 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
Summit is unincorporated, so Pima 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.
Summit is in ZIP code 85756
ZIP codes where Summit residents live, with the share of the town in each.
| ZIP | Post office name | Share of Summit | ZIP’s residents in Summit |
|---|---|---|---|
| 85756 | Tucson, AZ | 100% | 13% |
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 Summit
Who supplies Summit’s drinking water, and has it had violations?
Summit Water Coop (EPA ID AZ0420595). 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 7.0 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in Summit?
Tucson Electric Power (Tucson Electric Power Co), an investor-owned utility. Its homes paid about 14.9¢ per kWh in 2025 (EIA).
What internet providers serve Summit?
Cox Communications, CenturyLink, Verizon, T-Mobile, Simply Bits, Bluespan Wireless (FCC, as of December 2025).
What ZIP codes are in Summit?
85756. Census 2020 ZIP Code Tabulation Areas.
What school district is Summit in?
Sunnyside Unified District.
How do I register to vote in Summit?
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 Pima 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.