Wedgwood, The · Photo: Larry D. Moore · CC BY 4.0Living in Castle Hills, TX: what to set up and who to call
Power in Castle Hills comes from City of San Antonio, a municipal utility rather than a private company. The closest public drop-off to Castle Hills is San Antonio Bitters Recycling Center, 3 miles out; the town decides whether residents may use it.
I’m new in town
What to set up in Castle Hills, 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 Castle Hills.
Power comes from City of San Antonio
City of San Antonio (City of San Antonio - (TX)), a municipal utility, serves all of Castle Hills. 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 Castle Hills: about 1% of residents live in its service area. About 99% 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 Castle Hills
98% of 1,696 addresses can get 100/20 Mbps; 87% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| AT&T | Fiber, Fixed wireless, DSL | 96% | 5,000/5,000 |
| Spectrum | Cable, Fiber | 95% | 1,000/35 |
| Astound Broadband | Cable, Fiber | 50% | 1,500/50 |
| Verizon | Fixed wireless | 94% | 300/20 |
| T-Mobile | Fixed wireless | 18% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
Trash day in Castle Hills depends on your street
Pickup days, the drop-off and recycling in Castle Hills, from the town’s own site.
Your pickup week
- TrashEvery week, on your street’s dayLook up your day on cityofcastlehills.com
- Bulky itemsCall to book
Accepted at the curb
- Aluminum Cans
- Brown paper Bags
- Carton/Paperboard (like Cereal Boxes)
- Glass Bottles and Jars
- Junk Mail
- Magazines
- Office Paper
- Paper Cardboard/Dairy/Juice Containers
- Phone Books
- Plastic Bottles/Containers (numbers 1-7)
- Tin or Steel Cans
From cityofcastlehills.com, the town’s official site, checked Oct 21, 2026; pages dated 2026, October 2021, Rev.12.2025. Rules change: the town’s page is the last word. .
Where your child goes to school
Public school districts and the school path by grade.
Castle Hills is in North East Independent School District.
B−School gradeSee Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Jun 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Castle Hills spans 2 ZIP codes
ZIP codes where Castle Hills residents live, with the share of the town in each.
| ZIP | Post office name | Share of Castle Hills | ZIP’s residents in Castle Hills |
|---|---|---|---|
| 78213 | San Antonio, TX | 95% | 9% |
| 78216 | San Antonio, TX | 5% | 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 Castle Hills
Who supplies Castle Hills’ 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 Castle Hills?
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 Castle Hills?
AT&T, Spectrum, Astound Broadband, Verizon, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Castle Hills?
78213 (95%), 78216 (5%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Castle Hills in?
North East Independent School District.
How do I register to vote in Castle Hills?
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: Castle Hills’ own website (cityofcastlehills.com), read Oct 21, 2026, pickup and drop-off facts extracted and checked against the page they came from.
- 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.