EPA Air · stack tests by state, industry and year
Mining support (NAICS 2131): stack tests in Montana, 2026
- 4Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row is one stack test recorded during 2026 at a Montana source whose primary industry code is NAICS 2131. A facility filing more than one industry code is counted under the first one on its record.
Other industries in Montana, 2026
- Utilities (NAICS 2211) 31
- Petroleum and coal products manufacturing (NAICS 3241) 29
- Pipeline transportation (NAICS 4862) 17
- Nonmetallic mineral product manufacturing (NAICS 3273) 5
- Merchant wholesalers, nondurable goods (NAICS 4247) 3
Air-emissions stack tests recorded in Montana, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-01-23 | KRAKEN CENTRAL SITE | SIDNEY, Richland, MT | Pass | State |
| 2026-01-23 | KRAKEN CENTRAL SITE | SIDNEY, Richland, MT | Pass | State |
| 2026-01-23 | KRAKEN CENTRAL SITE | SIDNEY, Richland, MT | Pass | State |
| 2026-01-23 | KRAKEN CENTRAL SITE | SIDNEY, Richland, MT | Pass | State |
Primary NAICS code as filed on the facility record; dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.