EPA Air · stack tests by county and year
Air-emissions stack tests in Marshall County, West Virginia, 2026
- 26Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Marshall County, West Virginia during 2026. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Marshall County facility page.
Marshall County, West Virginia, 2026
Air-emissions stack tests in Marshall County, other years
Air-emissions stack tests recorded in Marshall County, West Virginia, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-08-04 | EQT XL MIDSTREAM OPERATING LLC, CHANNING COMPRESSOR | Pass | State |
| 2026-07-09 | CNX MIDSTREAM OPERATING COMPANY LLC, MAJORSVILLE STATION | Pass | State |
| 2026-07-06 | KENTUCKY POWER COMPANY, MITCHELL PLANT | Pass | State |
| 2026-06-17 | APPALACHIA MIDSTREAM SERVICES, L.L.C., SAND HILL STATION | Pass | State |
| 2026-06-05 | WILLIAMS OHIO VALLEY MIDSTREAM LLC, OAK GROVE | Pass | State |
| 2026-05-29 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | Pass | State |
| 2026-05-28 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | Pass | State |
| 2026-05-27 | COLUMBIA GAS TRANSMISSION, LLC, LONE OAK STATION | Pass | State |
| 2026-04-14 | KENTUCKY POWER COMPANY, MITCHELL PLANT | Pass | State |
| 2026-04-07 | MARKWEST LIBERTY MIDSTREAM & RESOURCES, L.L.C., MAJORSVILLE | Pass | State |
| 2026-04-02 | CNX MIDSTREAM OPERATING COMPANY LLC, DRY RIDGE STATION | Pass | State |
| 2026-03-31 | MARKWEST LIBERTY MIDSTREAM & RESOURCES, L.L.C., MAJORSVILLE | Pass | State |
| 2026-03-26 | APPALACHIA MIDSTREAM SERVICES, L.L.C., RIDGELINE STATION | Pass | State |
| 2026-03-24 | APPALACHIA MIDSTREAM SERVICES, L.L.C., RIDGELINE STATION | Pass | State |
| 2026-03-20 | COVESTRO LLC, NEW MARTINSVILLE | Pass | State |
| 2026-03-12 | MARKWEST LIBERTY MIDSTREAM & RESOURCES, L.L.C., MAJORSVILLE | Pass | State |
| 2026-03-05 | WILLIAMS OHIO VALLEY MIDSTREAM LLC, FT. BEELER | Pass | State |
| 2026-02-26 | BLUE RACER MIDSTREAM, LLC, NATRIUM EXTRACTION & FRACTIONA | Pass | State |
| 2026-02-25 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | Pass | State |
| 2026-02-25 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | Pass | State |
| 2026-02-24 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | Pass | State |
| 2026-02-19 | KENTUCKY POWER COMPANY, MITCHELL PLANT | Pass | State |
| 2026-02-18 | KENTUCKY POWER COMPANY, MITCHELL PLANT | Pass | State |
| 2026-02-17 | KENTUCKY POWER COMPANY, MITCHELL PLANT | Pass | State |
| 2026-02-11 | APPALACHIA MIDSTREAM SERVICES, L.L.C., PLEASANTS | Pass | State |
| 2026-02-05 | APPALACHIA MIDSTREAM SERVICES, L.L.C., MILLER STATION | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.