Living in Big Sioux Township, SD: what to set up and who to call
Power in Big Sioux Township comes from Union County Electric Coop, a cooperative utility rather than a private company. For emergencies, Big Sioux Township is closest to St. Lukes Regional Medical Center, 5.3 miles away.
I’m new in town
What to set up in Big Sioux Township, 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 Big Sioux Township.
Power comes from Union County Electric Coop
Union County Electric Coop (Union County Electric Coop Inc), a cooperative utility, serves all of Big Sioux Township.
Start or move service: unioncounty.coop · (605) 356-3395
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Dakota Dunes Cid water system
The Dakota Dunes Cid water system supplies Big Sioux Township: about 86% of residents live in its service area. Clay Rws/South Union serves another 13%. It buys ground water influenced by surface water (EPA lists Sioux City Water Supply as seller) and serves 3,700 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 80% of the 5,012 systems serving 3,301–10,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan–Dec 2025, was 4.0 ppb, below the 15 ppb action level that applied. That’s higher than 87% 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. SD4602093.
7 home internet providers serve Big Sioux Township
98% of 1,525 addresses can get 100/20 Mbps; 83% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Sparklight | Cable | 96% | 1,000/50 |
| Long Lines Metro | Cable, Fiber | 85% | 1,500/50 |
| ImOn Communications | Fiber | 79% | 1,000/1,000 |
| CenturyLink | DSL | 15% | 100/10 |
| T-Mobile | Fixed wireless | 81% | 25/3 |
| AT&T | Fixed wireless | 65% | 25/3 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Big Sioux Township’s trash rules yet
Pickup rules, the dump and recycling in Big Sioux Township.
Where your child goes to school
Public school districts and the school path by grade.
Big Sioux Township is in Dakota Valley School District 61-8.
A−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 Sep 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Aug 3, 2026.
Big Sioux Township is in ZIP code 57049
ZIP codes where Big Sioux Township residents live, with the share of the town in each.
| ZIP | Post office name | Share of Big Sioux Township | ZIP’s residents in Big Sioux Township |
|---|---|---|---|
| 57049 | North Sioux City, SD | 100% | 61% |
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 Big Sioux Township
Who supplies Big Sioux Township’s drinking water, and has it had violations?
The Dakota Dunes Cid water system (EPA ID SD4602093). It reported no health-based violations to EPA in the five years to October 2026; 80% of systems its size had none. Its latest lead 90th percentile was 4.0 ppb (Jan–Dec 2025), against a 15 ppb action level.
Who provides electricity in Big Sioux Township?
Union County Electric Coop (Union County Electric Coop Inc), a cooperative utility.
What internet providers serve Big Sioux Township?
Sparklight, Long Lines Metro, ImOn Communications, CenturyLink, T-Mobile, AT&T (FCC, as of December 2025).
What ZIP codes are in Big Sioux Township?
57049. Census 2020 ZIP Code Tabulation Areas.
What school district is Big Sioux Township in?
Dakota Valley School District 61-8.
How do I register to vote in Big Sioux Township?
South Dakota has no online registration; you can register in person until 15 days before Election Day or by mail (received 15 days before). Elections here are run by the Union County Auditor. Check your registration at vip.sdsos.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 Aug 3, 2026 (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.