Coronado National Memorial · Photo: Ian Poellet · CC BY-SA 4.0Living in Sierra Vista Southeast, AZ: what to set up and who to call
Sierra Vista Southeast has no town government of its own, so Cochise County runs its elections and most services, and its children attend Palominas Elementary District. Power in Sierra Vista Southeast comes from Sulphur Springs Valley E C, a cooperative utility rather than a private company.
I’m new in town
What to set up in Sierra Vista Southeast, 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 Sierra Vista Southeast.
Power comes from Sulphur Springs Valley E C
Sulphur Springs Valley E C (Sulphur Springs Valley E C Inc), a cooperative utility, serves 98.7% of Sierra Vista Southeast residents. Its homes paid an average of 14.6¢ per kWh in 2025, about $107 a month (its average across Arizona).
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Bella Vista Water South
Bella Vista Water South supplies Sierra Vista Southeast: about 16% of residents live in its service area. Southern Sunrise Wc Cochise Horseshoe serves another 14%. Pueblo Del Sol Water Company serves another 13%. East Slope Water Company serves another 11%. Southland Utilities - Golden Acres serves another 8%. About 33% 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 2,178 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 2024–Dec 2026, was 0.0 ppb, below the 15 ppb action level that applied. The highest in five years was 1.4 ppb. 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. AZ0402007.
7 home internet providers serve Sierra Vista Southeast
66% of 6,774 addresses can get 100/20 Mbps; 12% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Cox Communications | Cable, Fiber | 57% | 2,000/35 |
| CenturyLink | DSL | 30% | 60/5 |
| Hpaznet | Fixed wireless | 97% | 100/25 |
| AT&T | Fixed wireless | 56% | 100/20 |
| Verizon | Fixed wireless | 52% | 300/20 |
| T-Mobile | Fixed wireless | 48% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Sierra Vista Southeast’s trash rules yet
Pickup rules, the dump and recycling in Sierra Vista Southeast.
Where your child goes to school
Public school districts and the school path by grade.
Most of Sierra Vista Southeast (64%) is in Palominas Elementary District; parts are in Sierra Vista Unified District (36%).
B+School 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
Sierra Vista Southeast is unincorporated, so Cochise 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.
Sierra Vista Southeast spans 3 ZIP codes
ZIP codes where Sierra Vista Southeast residents live, with the share of the town in each.
| ZIP | Post office name | Share of Sierra Vista Southeast | ZIP’s residents in Sierra Vista Southeast |
|---|---|---|---|
| 85650 | Sierra Vista, AZ | 52% | 50% |
| 85615 | Hereford, AZ | 46% | 74% |
| 85635 | Sierra Vista, AZ | 2% | 1% |
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 Sierra Vista Southeast
Who supplies Sierra Vista Southeast’s drinking water, and has it had violations?
Bella Vista Water South (EPA ID AZ0402007). 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 2024–Dec 2026), against a 15 ppb action level.
Who provides electricity in Sierra Vista Southeast?
Sulphur Springs Valley E C (Sulphur Springs Valley E C Inc), a cooperative utility. Its homes paid about 14.6¢ per kWh in 2025 (EIA).
What internet providers serve Sierra Vista Southeast?
Cox Communications, CenturyLink, Hpaznet, AT&T, Verizon, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Sierra Vista Southeast?
85650 (52%), 85615 (46%), 85635 (2%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Sierra Vista Southeast in?
Palominas Elementary District. Parts of the city are in Sierra Vista Unified District.
How do I register to vote in Sierra Vista Southeast?
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 Cochise 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.