EPA Air · stack tests by state, industry and year
Pipeline transportation (NAICS 4862): stack tests in Maryland, 2025
- 7Stack 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 Maryland source whose primary industry code is NAICS 4862. A facility filing more than one industry code is counted under the first one on its record.
Pipeline transportation (NAICS 4862) in Maryland, other years
Other industries in Maryland, 2025
- Utilities (NAICS 2211) 12
- Waste management and remediation (NAICS 5622) 11
- Hospitals (NAICS 6221) 4
- Nonmetallic mineral product manufacturing (NAICS 3273) 4
- Food manufacturing (NAICS 3118) 3
Air-emissions stack tests recorded in Maryland, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-18 | DOMINION ENERGY COVE POINT LNG, LP | LUSBY, Calvert, MD | Pass | State |
| 2025-11-05 | TRANSCONTINENTAL GAS PIPELINE | ELLICOTT CITY, Howard, MD | Pass | State |
| 2025-10-21 | DOMINION TRANSMISSION, INC | MIDDLETOWN, Frederick, MD | Pass | State |
| 2025-08-05 | TRANSCONTINENTAL GAS PIPELINE | ELLICOTT CITY, Howard, MD | Pass | State |
| 2025-05-13 | TEXAS EASTERN TRANSMISSION | ACCIDENT, Garrett, MD | Pass | State |
| 2025-03-04 | DOMINION ENERGY COVE POINT LNG, LP | LUSBY, Calvert, MD | Pass | State |
| 2025-01-30 | TRANSCONTINENTAL GAS PIPELINE | ELLICOTT CITY, Howard, MD | 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.