Living in Mound City, SD: what to set up and who to call
Every home in Mound City is in ZIP code 57646. For an emergency, Mobridge Regional Hospital - Cah is the closest ER, 22.2 miles away.
I’m new in town
What to set up in Mound City, 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 Mound City.
Power comes from Montana-Dakota Utilities
Montana-Dakota Utilities (Montana-Dakota Utilities Co), an investor-owned utility, serves all of Mound City. Its homes paid an average of 13.0¢ per kWh in 2025, about $111 a month (its average across South Dakota).
Start or move service: montana-dakota.com · (800) 638-3278
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from WEB Water
WEB Water supplies almost all of Mound City. It draws surface water and serves 20,750 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 83% of the 3,525 systems serving 10,001–50,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan–Dec 2025, was 2.0 ppb, below the 15 ppb action level that applied. That’s higher than 65% 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. SD4601089.
2 home internet providers serve Mound City
100% of 84 addresses can get 100/20 Mbps; 100% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Valley Telecommunications | Fiber | 100% | 1,000/1,000 |
| Verizon | Fixed wireless | 63% | 300/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Mound City’s trash rules yet
Pickup rules, the dump and recycling in Mound City.
Where your child goes to school
Public school districts and the school path by grade.
Mound City is in Mobridge-Pollock School District 62-6.
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 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Aug 3, 2026.
Mound City is in ZIP code 57646
ZIP codes where Mound City residents live, with the share of the town in each.
| ZIP | Post office name | Share of Mound City | ZIP’s residents in Mound City |
|---|---|---|---|
| 57646 | Mound City, SD | 100% | 33% |
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 Mound City
Who supplies Mound City’s drinking water, and has it had violations?
WEB Water (EPA ID SD4601089). It reported no health-based violations to EPA in the five years to October 2026; 83% of systems its size had none. Its latest lead 90th percentile was 2.0 ppb (Jan–Dec 2025), against a 15 ppb action level.
Who provides electricity in Mound City?
Montana-Dakota Utilities (Montana-Dakota Utilities Co), an investor-owned utility. Its homes paid about 13.0¢ per kWh in 2025 (EIA).
What internet providers serve Mound City?
Valley Telecommunications, Verizon (FCC, as of December 2025).
What ZIP codes are in Mound City?
57646. Census 2020 ZIP Code Tabulation Areas.
What school district is Mound City in?
Mobridge-Pollock School District 62-6.
How do I register to vote in Mound City?
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 Campbell 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.