EPA Air · stack tests by state, industry and year
Mining and quarrying (NAICS 2123): stack tests in Colorado, 2025
- 3Stack 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 2025 at a Colorado source whose primary industry code is NAICS 2123. A facility filing more than one industry code is counted under the first one on its record.
Mining and quarrying (NAICS 2123) in Colorado, other years
- 2020 4
Other industries in Colorado, 2025
- Oil and gas extraction (NAICS 2111) 286
- Utilities (NAICS 2211) 34
- Pipeline transportation (NAICS 4862) 17
- Nonmetallic mineral product manufacturing (NAICS 3273) 13
- Waste management and remediation (NAICS 5622) 10
- Fabricated metal product manufacturing (NAICS 3324) 9
- Petroleum and coal products manufacturing (NAICS 3241) 5
- Nonmetallic mineral product manufacturing (NAICS 3272) 5
- Merchant wholesalers, nondurable goods (NAICS 4247) 4
- Food manufacturing (NAICS 3115) 4
- Beverage and tobacco manufacturing (NAICS 3121) 3
Air-emissions stack tests recorded in Colorado, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-12 | ARCOSA LWB LLC - LIGHTWEIGHT - BOULDER — high-priority violation on file | SUPERIOR AREA, Jefferson, CO | Pass | State |
| 2025-08-29 | ARCOSA LWB LLC - LIGHTWEIGHT - BOULDER — high-priority violation on file | SUPERIOR AREA, Jefferson, CO | Pass | State |
| 2025-07-22 | OLDCASTLE SW GROUP - GYPSUM RANCH | GYPSUM AREA, Eagle, CO | 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.