Living in Merton Township, SD: what to set up and who to call
Tap water in Merton Township comes from Clark Rural Water System, which has a clean five-year EPA record (about 22% of systems its size had a health-based violation) and a latest lead result below detection. For an emergency, Avera De Smet Memorial Hospital - Cah is the closest ER, 26.7 miles away.
I’m new in town
What to set up in Merton 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 Merton Township.
Power comes from NorthWestern Energy
NorthWestern Energy (NorthWestern Energy - (SD)), an investor-owned utility, serves all of Merton Township. Its homes paid an average of 13.3¢ per kWh in 2025, about $125 a month (its average across South Dakota).
Start or move service: northwesternenergy.com · (800) 245-6977
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Clark Rural Water System
Clark Rural Water System supplies almost all of Merton Township. It draws ground water and serves 2,325 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 7,966 systems serving 1,001–3,300 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan–Dec 2025, was 0.0 ppb, below the 15 ppb action level that applied. The highest in five years was 1.0 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. Violations are counted by the start of their compliance period. SD4600881.
3 home internet providers serve Merton Township
100% of 30 addresses can get 100/20 Mbps; 100% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| ITC | Fiber | 100% | 1,000/1,000 |
| Verizon | Fixed wireless | 30% | 300/20 |
| GigFire | Fixed wireless | 13% | 150/130 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Merton Township’s trash rules yet
Pickup rules, the dump and recycling in Merton Township.
Where your child goes to school
Public school districts and the school path by grade.
Most of Merton Township (54%) is in Clark School District 12-2; parts are in Willow Lake School District 12-3 (46%).
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.
Merton Township spans 3 ZIP codes
ZIP codes where Merton Township residents live, with the share of the town in each.
| ZIP | Post office name | Share of Merton Township | ZIP’s residents in Merton Township |
|---|---|---|---|
| 57225 | Clark, SD | 56% | 2% |
| 57271 | Vienna, SD | 38% | 11% |
| 57278 | Willow Lake, SD | 5% | 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 Merton Township
Who supplies Merton Township’s drinking water, and has it had violations?
Clark Rural Water System (EPA ID SD4600881). It reported no health-based violations to EPA in the five years to October 2026; 78% of systems its size had none. Its latest lead 90th percentile was 0.0 ppb (Jan–Dec 2025), against a 15 ppb action level.
Who provides electricity in Merton Township?
NorthWestern Energy (NorthWestern Energy - (SD)), an investor-owned utility. Its homes paid about 13.3¢ per kWh in 2025 (EIA).
What internet providers serve Merton Township?
ITC, Verizon, GigFire (FCC, as of December 2025).
What ZIP codes are in Merton Township?
57225 (56%), 57271 (38%), 57278 (5%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Merton Township in?
Clark School District 12-2. Parts of the city are in Willow Lake School District 12-3.
How do I register to vote in Merton 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 Clark 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.