EPA Air · by county
Air-emissions sources in Yellowstone County, Montana
- 24Facilities
8 changes to this record in 90 days; alerts $99/month.
Start the watch
- One source — $99/month
- One county — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
Every stationary source in Yellowstone 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 Yellowstone County
Each of the 23 operating major, synthetic minor and minor sources in Yellowstone County, Montana has a record page: every source in Yellowstone County, A to Z.
By emissions classification in Yellowstone County
A source’s classification is the size band its potential emissions put it in: a major source is large enough to need a Title V operating permit, a synthetic minor has accepted limits to stay below that line, and a minor source sits below it outright.
- Minor source 12
- Major source 10
Inspections in Yellowstone County, by year
A compliance evaluation is the on-site or file review a state, local or federal air agency records against a permitted source.
- 2026 inspections 7
- 2025 inspections 5
- 2024 inspections 6
- 2023 inspections 5
- 2022 inspections 4
- 2021 inspections 6
- 2020 inspections 7
- 2019 inspections 7
- 2018 inspections 8
- 2017 inspections 12
Violations in Yellowstone County, by year
A high-priority violation is the most serious class of Clean Air Act non-compliance an agency records against a source; a federally reportable violation is the next step down in severity.
Stack tests in Yellowstone County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
- 2026 stack tests 27
- 2025 stack tests 52
- 2024 stack tests 82
- 2023 stack tests 51
- 2022 stack tests 56
- 2021 stack tests 67
- 2020 stack tests 74
- 2019 stack tests 86
- 2018 stack tests 95
- 2017 stack tests 105
Inspections in Yellowstone County, year by year · Violations in Yellowstone County, year by year · Stack tests in Yellowstone 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
- Jefferson County 3
- 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
Facilities
| Facility↑↓ | Classification↑↓ | HPV |
|---|---|---|
| AIR CONTROLS CO. | Minor source | No |
| BILLINGS BAKERY | Synthetic minor source | No |
| BILLINGS CITY LANDFILL | Minor source | No |
| BILLINGS REFINERY | Major source | No |
| BILLINGS TRANSPORTATION OPERATIONS | Major source | No |
| BROWN'S AUTO SERVICE | Minor source | No |
| BUREAU INDIAN AFFAIRS (BIA) ASPHALT PLNT | Minor source | No |
| C&L TRUCK REPAIR | Minor source | No |
| CARL WEISSMAN & SONS | Minor source | No |
| CHS INC REFINERY LAUREL | Major source | No |
| CITY OF BILLINGS REGIONAL LANDFILL | Major source | No |
| GENSCO, INC. | Minor source | No |
| GOLDEN RECYCLING | Minor source | No |
| JIM'S QUALITY APPLIANCE | Minor source | No |
| MONTANA SULPHUR & CHEMICAL | Major source | No |
| PACIFIC RECYCLING | Minor source | No |
| PAR MONTANA BILLINGS REFINERY | Major source | No |
| PAR MONTANA BULK TERMINAL | Major source | No |
| POLY CONOCO AUTO REPAIR | Minor source | No |
| PRO TECH MECHANICAL INC. | Minor source | No |
| TRUENORTH STEEL - BILLINGS | Synthetic minor source | No |
| WESTERN SUGAR COOPERATIVE | Major source | Yes |
| YELLOWSTONE COUNTY GENERATING STATION | Major source | No |
| YELLOWSTONE POWER PLANT | Major source | Yes |
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 Yellowstone county, MT. It lists 24 facilities in Yellowstone county and 10 major sources.