Living in Sun Prairie, MT: what to set up and who to call
Sun Prairie has no town government of its own, so Cascade County runs its elections and most services, and its children attend Great Falls Elementary School District. Tap water in most of Sun Prairie comes from the Sun Prairie Village County 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 of 1.0 ppb.
I’m new in town
What to set up in Sun Prairie, 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 Sun Prairie.
Power comes from NorthWestern Energy
NorthWestern Energy (NorthWestern Energy LLC - (MT)), an investor-owned utility, serves all of Sun Prairie. Its homes paid an average of 14.4¢ per kWh in 2025, about $102 a month (its average across Montana, for customers on its standard service). Montana lets you buy power from another supplier; 0% of NorthWestern Energy’s home customers do, and NorthWestern Energy still delivers it.
Start or move service: northwesternenergy.com · (888) 467-2669
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Sun Prairie Village County water system
The Sun Prairie Village County water system supplies Sun Prairie: about 72% of residents live in its service area. Sun Prairie Water District serves another 21%. About 17% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws ground water and serves 1,800 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 2021–Dec 2023, was 1.0 ppb, below the 15 ppb action level that applied. The highest in five years was 2.0 ppb. That’s lower 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. MT0000521.
5 home internet providers serve Sun Prairie
12% of 719 addresses can get 100/20 Mbps; 0% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| CenturyLink | DSL | 69% | 40/3 |
| Konceptio Data Services | Fixed wireless | 100% | 45/18 |
| The Montana Internet | Fixed wireless | 79% | 25/5 |
| T-Mobile | Fixed wireless | 45% | 100/20 |
| Verizon | Fixed wireless | 11% | 300/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Sun Prairie’s trash rules yet
Pickup rules, the dump and recycling in Sun Prairie.
Where your child goes to school
Public school districts and the school path by grade.
Sun Prairie is in two districts that split the grades: Great Falls Elementary School District and Great Falls High School District.
BSchool gradeSee 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
Sun Prairie is unincorporated, so Cascade County is the local government.
Election office: FVAP local election office directory, updated Feb 2024; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Sun Prairie is in ZIP code 59404
ZIP codes where Sun Prairie residents live, with the share of the town in each.
| ZIP | Post office name | Share of Sun Prairie | ZIP’s residents in Sun Prairie |
|---|---|---|---|
| 59404 | Great Falls, MT | 100% | 6% |
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 Sun Prairie
Who supplies Sun Prairie’s drinking water, and has it had violations?
The Sun Prairie Village County water system (EPA ID MT0000521). 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 1.0 ppb (Jan 2021–Dec 2023), against a 15 ppb action level.
Who provides electricity in Sun Prairie?
NorthWestern Energy (NorthWestern Energy LLC - (MT)), an investor-owned utility. Its homes paid about 14.4¢ per kWh in 2025 (EIA).
What internet providers serve Sun Prairie?
CenturyLink, Konceptio Data Services, The Montana Internet, T-Mobile, Verizon (FCC, as of December 2025).
What ZIP codes are in Sun Prairie?
59404. Census 2020 ZIP Code Tabulation Areas.
What school district is Sun Prairie in?
Great Falls Elementary School District and Great Falls High School District. Parts of the city are in Vaughn Elementary School District and Simms High School District.
How do I register to vote in Sun Prairie?
Montana has no online registration; you can register in person up to and including Election Day or by mail (postmarked 30 days before). Elections here are run by the Cascade County Election Administrator. Check your registration at prodvoterportal.mt.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 Nov 18, 2024 (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.