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.

What this page shows

This page covers Clean Air Act facilities in the EPA air register with stack tests in Marshall, WV, in 2026. It lists 26 stack tests recorded in 2026.