Living in Castleford, ID: what to set up and who to call
Tap water in Castleford comes from the City of Castleford water system, which has a clean five-year EPA record (about 23% of systems its size had a health-based violation) and a latest lead result below detection. For an emergency, St. Lukes Magic Valley Medical Center is the closest ER, 21.4 miles away.
I’m new in town
What to set up in Castleford, 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 Castleford.
Power comes from Idaho Power
Idaho Power (Idaho Power Co), an investor-owned utility, serves all of Castleford. Its homes paid an average of 11.8¢ per kWh in 2025, about $106 a month (its average across Idaho).
Start or move service: idahopower.com · (800) 488-6151
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from City of Castleford water system
The City of Castleford water system supplies almost all of Castleford. It draws ground water and serves 275 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 77% of the 15,074 systems serving 101–500 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2023–Dec 2025, was 0.0 ppb, below the 15 ppb action level that applied. The highest in five years was 3.0 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 (EPA’s estimate). Violations are counted by the start of their compliance period. ID5420010.
5 home internet providers serve Castleford
100% of 113 addresses can get 100/20 Mbps; 0% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| CenturyLink | DSL | 87% | 40/3 |
| White Cloud Communications | Fixed wireless | 100% | 200/50 |
| Verizon | Fixed wireless | 90% | 300/20 |
| Anthem Broadband | Fixed wireless | 41% | 100/20 |
| Truleap Technologies | Fixed wireless | 12% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Castleford’s trash rules yet
Pickup rules, the dump and recycling in Castleford.
Where your child goes to school
Public school districts and the school path by grade.
Castleford is in Castleford School District 417.
Test scores and every school: see 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 Aug 2023; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 12, 2025.
Castleford is in ZIP code 83321
ZIP codes where Castleford residents live, with the share of the town in each.
| ZIP | Post office name | Share of Castleford | ZIP’s residents in Castleford |
|---|---|---|---|
| 83321 | Castleford, ID | 100% | 43% |
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 Castleford
Who supplies Castleford’s drinking water, and has it had violations?
The City of Castleford water system (EPA ID ID5420010). It reported no health-based violations to EPA in the five years to October 2026; 77% of systems its size had none. Its latest lead 90th percentile was 0.0 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in Castleford?
Idaho Power (Idaho Power Co), an investor-owned utility. Its homes paid about 11.8¢ per kWh in 2025 (EIA).
What internet providers serve Castleford?
CenturyLink, White Cloud Communications, Verizon, Anthem Broadband, Truleap Technologies (FCC, as of December 2025).
What ZIP codes are in Castleford?
83321. Census 2020 ZIP Code Tabulation Areas.
What school district is Castleford in?
Castleford School District 417.
How do I register to vote in Castleford?
In Idaho you can register online until 11 days before Election Day, in person up to and including Election Day, or by mail (received 11 days before). Elections here are run by the Twin Falls County Clerk. Check your registration at elections.sos.idaho.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 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.