Living in Carter, MT: what to set up and who to call
Carter has no town government of its own, so Chouteau County runs its elections and most services, and its children attend Carter Elementary School District. Carter Chouteau Co Water Dist reported one health-based violation to EPA in the last five years: a surface water treatment requirement (Long Term 2 Enhanced Surface Water Treatment Rule), beginning Dec 2025.
I’m new in town
What to set up in Carter, 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 Carter.
Power comes from NorthWestern Energy
NorthWestern Energy (NorthWestern Energy LLC - (MT)), an investor-owned utility, serves all of Carter. 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 Carter Chouteau Co Water Dist
Carter Chouteau Co Water Dist supplies Carter: about 0% of residents live in its service area. About 100% 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 150 people in all.
1 health-based violation reported to EPA in the five years to October 2026: a surface water treatment requirement (Long Term 2 Enhanced Surface Water Treatment Rule), beginning Dec 2025. 77% of the 15,074 systems serving 101–500 people had none.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2024–Dec 2026, was 0.0 ppb, below the 15 ppb action level that applied. 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. MT0000520.
1 home internet providers serve Carter
100% of 42 addresses can get 100/20 Mbps; 100% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| 3 Rivers Communications | Fiber | 100% | 1,000/1,000 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Carter’s trash rules yet
Pickup rules, the dump and recycling in Carter.
Where your child goes to school
Public school districts and the school path by grade.
Carter is in two districts that split the grades: Carter Elementary School District and Fort Benton 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
Carter is unincorporated, so Chouteau County is the local government.
Election office: FVAP local election office directory, updated Jan 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Carter is in ZIP code 59420
ZIP codes where Carter residents live, with the share of the town in each.
| ZIP | Post office name | Share of Carter | ZIP’s residents in Carter |
|---|---|---|---|
| 59420 | Carter, MT | 100% | 29% |
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 Carter
Who supplies Carter’s drinking water, and has it had violations?
Carter Chouteau Co Water Dist (EPA ID MT0000520). It reported 1 health-based violation to EPA in the five years to October 2026: a surface water treatment requirement (Long Term 2 Enhanced Surface Water Treatment Rule). 77% of systems its size had none. Its latest lead 90th percentile was 0.0 ppb (Jan 2024–Dec 2026), against a 15 ppb action level.
Who provides electricity in Carter?
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 Carter?
3 Rivers Communications (FCC, as of December 2025).
What ZIP codes are in Carter?
59420. Census 2020 ZIP Code Tabulation Areas.
What school district is Carter in?
Carter Elementary School District and Fort Benton High School District.
How do I register to vote in Carter?
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 Chouteau 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.