EPA Air · stack tests by state and year

Air-emissions stack tests in Oklahoma, 2026

15Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Oklahoma during 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Oklahoma, other years

Air-emissions stack tests recorded in Oklahoma, 2026

Date	Facility	Where	Kind	Agency
2026-06-25	ET GATHERING PROCESSING LLC / TUSSY COMPRESSOR STATION	RATLIFF CITY, Carter, OK	Pending	State
2026-06-24	ENLINK MIDSTREAM SERVICES LLC / SAPPHIRE COMPRESSOR STATION	CALUMET, Canadian, OK	Pending	State
2026-05-27	SOUTHERN STAR CTL GAS PIPELINE INC / RATLIFF CITY COMPRESSOR STATION	RATLIFF CITY, Carter, OK	Pass	State
2026-05-07	TARGA PIPELINE MIDCONTINENT WESTOK LLC / WAUKOMIS COMPRESSOR STATION	WAUKOMIS, Garfield, OK	Pass	State
2026-05-07	TARGA PIPELINE MIDCONTINENT WESTOK LLC / WAUKOMIS COMPRESSOR STATION	WAUKOMIS, Garfield, OK	Pass	State
2026-04-28	REDCLIFF MIDSTREAM LLC / REDCLIFF PLANT	MUTUAL, Woodward, OK	Pending	State
2026-04-27	REDCLIFF MIDSTREAM LLC / REDCLIFF PLANT	MUTUAL, Woodward, OK	Pending	State
2026-04-08	MARKWEST OKLAHOMA GAS CO LLC / DOROTHY COMPRESSOR STATION	KINGFISHER, Kingfisher, OK	Pass	State
2026-03-25	GEORGIA PACIFIC MUSKOGEE LLC / MUSKOGEE MILL	MUSKOGEE, Muskogee, OK	Pass	State
2026-03-24	P AND K STONE LLC / MILL CREEK QUARRY — high-priority violation on file	MILL CREEK, Johnston, OK	Pass	State
2026-03-24	GEORGIA PACIFIC MUSKOGEE LLC / MUSKOGEE MILL	MUSKOGEE, Muskogee, OK	Pass	State
2026-03-17	ET GATHERING PROCESSING LLC / ALEX COMPRESSOR STATION	ALEX, Grady, OK	Pass	State
2026-03-12	SUPERIOR MIDSTREAM LLC / REEDING COMPRESSOR STATION	CASHION, Kingfisher, OK	Pass	State
2026-02-17	ONEOK GAS TRANSPORTATION LLC / SALT CREEK COMPRESSOR STATION	DEPEW, Creek, OK	Pass	State
2026-01-30	TOM STACK LLC / BIG SKY COMPRESSOR STATION	UNION CITY, Canadian, OK	Pass	State

Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.

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