EPA Air · by county
Air-emissions sources in Jefferson County, Montana
- 3Facilities
Every stationary source in Jefferson County, Montana that holds a Clean Air Act permit or is otherwise tracked by an air agency — planned, under construction, operating, seasonal or temporarily closed. Sources EPA records as permanently closed are not listed.
Every source’s record in Jefferson County
Each of the 3 operating major, synthetic minor and minor sources in Jefferson County, Montana has a record page: every source in Jefferson County, A to Z.
Stack tests in Jefferson County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
- 2026 stack tests 4
- 2024 stack tests 4
- 2023 stack tests 4
- 2022 stack tests 5
- 2021 stack tests 9
- 2020 stack tests 5
- 2019 stack tests 6
- 2018 stack tests 6
- 2017 stack tests 7
Stack tests in Jefferson County, year by year
Other counties in Montana
Every county in the state with at least three sources on file.
- Big Horn County 4
- Cascade County 12
- Custer County 3
- Fallon County 5
- Flathead County 7
- Gallatin County 11
- Glacier County 5
- Lewis and Clark County 13
- Madison County 3
- Missoula County 18
- Powell County 3
- Richland County 4
- Roosevelt County 7
- Rosebud County 3
- Silver Bow County 3
- Stillwater County 5
- Toole County 4
- Yellowstone County 24
Facilities
| Facility↑↓ | Classification↑↓ | HPV |
|---|---|---|
| ASH GROVE CEMENT | Major source | No |
| BARRICK GOLDEN SUNLIGHT MINE | Major source | No |
| CIY/COUNTY SANITATION SERVICES | Minor source | No |
County as filed on the facility record. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register for Jefferson county, MT. It lists 3 facilities in Jefferson county and 2 major sources.