Living in Cross Mountain, TX: what to set up and who to call
Cross Mountain has no town government of its own, so Bexar County runs its elections and most services, and its children attend Northside Independent School District. Power in Cross Mountain comes from City of San Antonio, a municipal utility rather than a private company.
I’m new in town
What to set up in Cross Mountain, 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 Cross Mountain.
Power comes from City of San Antonio
City of San Antonio (City of San Antonio - (TX)), a municipal utility, serves 53.7% of Cross Mountain residents. Its homes paid an average of 12.4¢ per kWh in 2025, about $133 a month (its average across Texas).
Start or move service: cpsenergy.com · (800) 773-3077
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from San Antonio Water System
San Antonio Water System supplies Cross Mountain: about 87% of residents live in its service area. Stagecoach Hills serves another 13%. About 7% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It buys treated surface water (EPA lists Water Exploration Stein Roger Well Field and Central Texas Regional WSC and Gbra Western Canyon Water Supply and Crwa Lake Dunlap WTP and Schertz Seguin Local Government Corporat as sellers) and serves 2,643,729 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 82% of the 27 systems serving more than 1,000,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2022–Dec 2024, was 1.6 ppb, below the 15 ppb action level that applied. The highest in five years was 2.2 ppb. That’s lower than 52% 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. TX0150018.
5 home internet providers serve Cross Mountain
96% of 1,431 addresses can get 100/20 Mbps; 27% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| AT&T | DSL, Fiber, Fixed wireless | 84% | 5,000/5,000 |
| Spectrum | Cable, Fiber | 81% | 1,000/35 |
| Verizon | Fixed wireless | 94% | 300/20 |
| T-Mobile | Fixed wireless | 38% | 100/20 |
| Hill Country Broadband | Fixed wireless | 21% | 40/4 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Cross Mountain’s trash rules yet
Pickup rules, the dump and recycling in Cross Mountain.
Where your child goes to school
Public school districts and the school path by grade.
Cross Mountain is in Northside 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
Cross Mountain is unincorporated, so Bexar 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.
Cross Mountain spans 2 ZIP codes
ZIP codes where Cross Mountain residents live, with the share of the town in each.
| ZIP | Post office name | Share of Cross Mountain | ZIP’s residents in Cross Mountain |
|---|---|---|---|
| 78255 | San Antonio, TX | 75% | 17% |
| 78256 | San Antonio, TX | 25% | 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 Cross Mountain
Who supplies Cross Mountain’s drinking water, and has it had violations?
San Antonio Water System (EPA ID TX0150018). It reported no health-based violations to EPA in the five years to October 2026; 82% of systems its size had none. Its latest lead 90th percentile was 1.6 ppb (Jan 2022–Dec 2024), against a 15 ppb action level.
Who provides electricity in Cross Mountain?
City of San Antonio (City of San Antonio - (TX)), a municipal utility. Its homes paid about 12.4¢ per kWh in 2025 (EIA).
What internet providers serve Cross Mountain?
AT&T, Spectrum, Verizon, T-Mobile, Hill Country Broadband (FCC, as of December 2025).
What ZIP codes are in Cross Mountain?
78255 (75%), 78256 (25%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Cross Mountain in?
Northside Independent School District.
How do I register to vote in Cross Mountain?
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 Bexar 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.