Living in Llano Grande, TX: what to set up and who to call
An EPA health-based violation from 2024 is still open for the City of Weslaco water system, which supplies Llano Grande. Llano Grande has no town government of its own, so Hidalgo County runs its elections and most services, and its children attend Weslaco Independent School District.
I’m new in town
What to set up in Llano Grande, 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 Llano Grande.
Power comes from Oncor
Oncor (Oncor Electric Delivery Co.), an investor-owned utility, serves all of Llano Grande.
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 City of Weslaco water system
The City of Weslaco water system supplies Llano Grande: about 2% of residents live in its service area. About 98% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws surface water and serves 40,033 people in all.
1 health-based violation reported to EPA in the five years to October 2026: a lead and copper treatment requirement (Lead and Copper Rule Revisions), beginning Oct 2024. 83% of the 3,525 systems serving 10,001–50,000 people had none. 1 older violation is still open, since 2024: a lead and copper treatment requirement (Lead and Copper Rule Revisions), per EPA’s records.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2023–Dec 2025, was 1.5 ppb, below the 15 ppb action level that applied. That’s higher than 58% 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. Violations are counted by the start of their compliance period. TX1080011.
8 home internet providers serve Llano Grande
100% of 1,228 addresses can get 100/20 Mbps; 69% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Spectrum | Cable, Fiber | 98% | 1,000/1,000 |
| Frontier | Fiber | 54% | 7,000/7,000 |
| Verizon | Fixed wireless | 93% | 300/20 |
| TWIN | Fixed wireless | 91% | 400/100 |
| VTX1 | Fixed wireless | 73% | 400/50 |
| AT&T | Fixed wireless | 44% | 25/3 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Llano Grande’s trash rules yet
Pickup rules, the dump and recycling in Llano Grande.
Where your child goes to school
Public school districts and the school path by grade.
Llano Grande is in Weslaco 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
Llano Grande 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.
Llano Grande is in ZIP code 78596
ZIP codes where Llano Grande residents live, with the share of the town in each.
| ZIP | Post office name | Share of Llano Grande | ZIP’s residents in Llano Grande |
|---|---|---|---|
| 78596 | Weslaco, TX | 100% | 8% |
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 Llano Grande
Who supplies Llano Grande’s drinking water, and has it had violations?
The City of Weslaco water system (EPA ID TX1080011). It reported 1 health-based violation to EPA in the five years to October 2026: a lead and copper treatment requirement (Lead and Copper Rule Revisions). 83% of systems its size had none. Its latest lead 90th percentile was 1.5 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in Llano Grande?
Oncor (Oncor Electric Delivery Co.), an investor-owned utility.
What internet providers serve Llano Grande?
Spectrum, Frontier, Verizon, TWIN, VTX1, AT&T (FCC, as of December 2025).
What ZIP codes are in Llano Grande?
78596. Census 2020 ZIP Code Tabulation Areas.
What school district is Llano Grande in?
Weslaco Independent School District.
How do I register to vote in Llano Grande?
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.