Pierre Masonic Lodge · Photo: Jeffrey Beall · CC BY-SA 3.0Living in Cow Creek, SD: what to set up and who to call
Cow Creek has no town government of its own, so Sully County runs its elections and most services, and its children attend Agar-Blunt-Onida School District 58-3. Tap water in most of Cow Creek comes from Spring Creek Sanitary District, which has a clean five-year EPA record (about 23% of systems its size had a health-based violation) and a latest lead result of 1.0 ppb.
I’m new in town
What to set up in Cow Creek, 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 Cow Creek.
Power comes from Oahe Electric Coop
Oahe Electric Coop (Oahe Electric Coop Inc), a cooperative utility, serves all of Cow Creek. Its homes paid an average of 10.5¢ per kWh in 2025, about $170 a month (its average across South Dakota).
Start or move service: oaheelectric.com · (605) 962-6243
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Spring Creek Sanitary District
Spring Creek Sanitary District supplies Cow Creek: about 64% of residents live in its service area. About 34% 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 Mid-Dakota Rural Water as seller) and serves 465 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–Dec 2025, was 1.0 ppb, below the 15 ppb action level that applied. The highest in five years was 3.0 ppb. That’s higher 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. SD4602089.
4 home internet providers serve Cow Creek
100% of 160 addresses can get 100/20 Mbps; 100% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Venture Communications | Fiber | 100% | 1,000/1,000 |
| Wisp West, Celerity Internet | Fixed wireless | 98% | 100/20 |
| Verizon | Fixed wireless | 61% | 300/20 |
| T-Mobile | Fixed wireless | 38% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Cow Creek’s trash rules yet
Pickup rules, the dump and recycling in Cow Creek.
Where your child goes to school
Public school districts and the school path by grade.
Cow Creek is in Agar-Blunt-Onida School District 58-3.
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.
No town hall: the county runs things
Cow Creek is unincorporated, so Sully County is the local government.
Election office: FVAP local election office directory, updated Jul 2023; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Aug 3, 2026.
Cow Creek is in ZIP code 57501
ZIP codes where Cow Creek residents live, with the share of the town in each.
| ZIP | Post office name | Share of Cow Creek | ZIP’s residents in Cow Creek |
|---|---|---|---|
| 57501 | Pierre, SD | 100% | 0% |
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 Cow Creek
Who supplies Cow Creek’s drinking water, and has it had violations?
Spring Creek Sanitary District (EPA ID SD4602089). 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 1.0 ppb (Jan–Dec 2025), against a 15 ppb action level.
Who provides electricity in Cow Creek?
Oahe Electric Coop (Oahe Electric Coop Inc), a cooperative utility. Its homes paid about 10.5¢ per kWh in 2025 (EIA).
What internet providers serve Cow Creek?
Venture Communications, Wisp West, Celerity Internet, Verizon, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Cow Creek?
57501. Census 2020 ZIP Code Tabulation Areas.
What school district is Cow Creek in?
Agar-Blunt-Onida School District 58-3.
How do I register to vote in Cow Creek?
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 Sully 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.