Photo: Royalbroil · CC BY-SA 3.0Living in St. Mary, MT: what to set up and who to call
St. Mary has no town government of its own, so Glacier County runs its elections and most services, and its children attend Browning Elementary School District. The St Mary Headquarters and Cg water system has a clean five-year EPA record, but its latest lead result, 10.0 ppb, was higher than 98% of similar systems’ (the action level is 15).
I’m new in town
What to set up in St. Mary, 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 St. Mary.
Power comes from NorthWestern Energy
NorthWestern Energy (NorthWestern Energy LLC - (MT)), an investor-owned utility, serves all of St. Mary. 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 St Mary Headquarters and Cg water system
The St Mary Headquarters and Cg water system supplies St. Mary: about 32% of residents live in its service area. About 68% 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 1,030 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 2022–Dec 2024, was 10.0 ppb, below the 15 ppb action level that applied. That’s higher than 98% 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 (EPA’s estimate). Violations are counted by the start of their compliance period. MT0002729.
2 home internet providers serve St. Mary
100% of 13 addresses can get 100/20 Mbps; 100% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Siyeh Communications | Fiber, Fixed wireless | 100% | 100/50 |
| Verizon | Fixed wireless | 46% | 300/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have St. Mary’s trash rules yet
Pickup rules, the dump and recycling in St. Mary.
Where your child goes to school
Public school districts and the school path by grade.
St. Mary is in two districts that split the grades: Browning Elementary School District and Browning High School District.
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
St. Mary is unincorporated, so Glacier County is the local government.
Election office: FVAP local election office directory, updated Jun 2024; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
St. Mary is in ZIP code 59417
ZIP codes where St. Mary residents live, with the share of the town in each.
| ZIP | Post office name | Share of St. Mary | ZIP’s residents in St. Mary |
|---|---|---|---|
| 59417 | Browning, MT | 100% | 1% |
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 St. Mary
Who supplies St. Mary’s drinking water, and has it had violations?
The St Mary Headquarters and Cg water system (EPA ID MT0002729). 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 10.0 ppb (Jan 2022–Dec 2024), against a 15 ppb action level.
Who provides electricity in St. Mary?
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 St. Mary?
Siyeh Communications, Verizon (FCC, as of December 2025).
What ZIP codes are in St. Mary?
59417. Census 2020 ZIP Code Tabulation Areas.
What school district is St. Mary in?
Browning Elementary School District and Browning High School District.
How do I register to vote in St. Mary?
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 Glacier 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.