Photo: Runner1928 · CC BY-SA 4.0Living in Oacoma, SD: what to set up and who to call
Tap water in Oacoma comes from the Oacoma 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 of 1.0 ppb. Power in Oacoma comes from West Central Electric Coop, a cooperative utility rather than a private company.
I’m new in town
What to set up in Oacoma, 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 Oacoma.
Power comes from West Central Electric Coop
West Central Electric Coop (West Central Electric Coop Inc - (SD)), a cooperative utility, serves all of Oacoma.
Start or move service: wce.coop · (605) 669-8100
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Oacoma water system
The Oacoma water system supplies Oacoma: about 91% of residents live in its service area. About 9% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws surface water and serves 391 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 2023, was 1.0 ppb, below the 15 ppb action level that applied. 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. SD4600229.
4 home internet providers serve Oacoma
100% of 249 addresses can get 100/20 Mbps; 100% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Midstate Communications | Fiber | 100% | 1,000/1,000 |
| Verizon | Fixed wireless | 73% | 25/6 |
| T-Mobile | Fixed wireless | 55% | 100/20 |
| AT&T | Fixed wireless | 12% | 25/3 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Oacoma’s trash rules yet
Pickup rules, the dump and recycling in Oacoma.
Where your child goes to school
Public school districts and the school path by grade.
Oacoma is in Chamberlain School District 07-1.
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 Jul 2023; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Aug 3, 2026.
Oacoma is in ZIP code 57365
ZIP codes where Oacoma residents live, with the share of the town in each.
| ZIP | Post office name | Share of Oacoma | ZIP’s residents in Oacoma |
|---|---|---|---|
| 57365 | Oacoma, SD | 100% | 85% |
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 Oacoma
Who supplies Oacoma’s drinking water, and has it had violations?
The Oacoma water system (EPA ID SD4600229). 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 2023), against a 15 ppb action level.
Who provides electricity in Oacoma?
West Central Electric Coop (West Central Electric Coop Inc - (SD)), a cooperative utility.
What internet providers serve Oacoma?
Midstate Communications, Verizon, T-Mobile, AT&T (FCC, as of December 2025).
What ZIP codes are in Oacoma?
57365. Census 2020 ZIP Code Tabulation Areas.
What school district is Oacoma in?
Chamberlain School District 07-1.
How do I register to vote in Oacoma?
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 Lyman 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.