Living in South Alamo, TX: what to set up and who to call
South Alamo has no town government of its own, so Hidalgo County runs its elections and most services, and its children attend Donna Independent School District. Oncor delivers the power in South Alamo, but in Texas’s open market you choose the company that sells it.
I’m new in town
What to set up in South Alamo, 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 South Alamo.
Power comes from Oncor
Oncor (Oncor Electric Delivery Co.), an investor-owned utility, serves all of South Alamo.
Start or move service: oncor.com · (888) 875-6279
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Military Hwy WSC Progreso
Military Hwy WSC Progreso supplies almost all of South Alamo. It draws ground water (EPA lists North Alamo WSC as seller) and serves 12,198 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 83% of the 3,525 systems serving 10,001–50,000 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. 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. TX1080234.
5 home internet providers serve South Alamo
100% of 878 addresses can get 100/20 Mbps; 3% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Spectrum | Cable, Fiber | 100% | 1,000/35 |
| AT&T | DSL, Fixed wireless, Fiber | 74% | 10/1 |
| VTX1 | Fixed wireless | 100% | 400/50 |
| TWIN | Fixed wireless | 99% | 400/100 |
| Verizon | Fixed wireless | 69% | 25/6 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have South Alamo’s trash rules yet
Pickup rules, the dump and recycling in South Alamo.
Where your child goes to school
Public school districts and the school path by grade.
South Alamo is in Donna Independent 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.
No town hall: the county runs things
South Alamo is unincorporated, so Hidalgo County is the local government.
Election office: FVAP local election office directory, updated Jun 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
South Alamo is in ZIP code 78516
ZIP codes where South Alamo residents live, with the share of the town in each.
| ZIP | Post office name | Share of South Alamo | ZIP’s residents in South Alamo |
|---|---|---|---|
| 78516 | Alamo, TX | 100% | 10% |
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 South Alamo
Who supplies South Alamo’s drinking water, and has it had violations?
Military Hwy WSC Progreso (EPA ID TX1080234). It reported no health-based violations to EPA in the five years to October 2026; 83% 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 South Alamo?
Oncor (Oncor Electric Delivery Co.), an investor-owned utility.
What internet providers serve South Alamo?
Spectrum, AT&T, VTX1, TWIN, Verizon (FCC, as of December 2025).
What ZIP codes are in South Alamo?
78516. Census 2020 ZIP Code Tabulation Areas.
What school district is South Alamo in?
Donna Independent School District.
How do I register to vote in South Alamo?
Texas has no online registration; you can register in person until 30 days before Election Day or by mail (postmarked 30 days before). Elections here are run by the Hidalgo County Early Voting Clerk. Check your registration at teamrv-mvp.sos.texas.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 Nov 18, 2024 (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.