EPA Air · stack tests by county and year

Air-emissions stack tests in Custer County, Oklahoma, 2025

20Stack 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 Custer County, Oklahoma during 2025. 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 Custer County facility page.

Custer County, Oklahoma, 2025

Air-emissions stack tests in Custer County, other years

Air-emissions stack tests recorded in Custer County, Oklahoma, 2025

Date	Facility	Kind	Agency
2025-10-20	ENABLE GAS TRANSMISSION LLC / CUSTER COMPRESSOR STATION	Pass	State
2025-09-11	MARKWEST OKLAHOMA GAS CO LLC / BUTLER ARAPAHO GAS PLANT — high-priority violation on file	Pass	State
2025-09-11	MARKWEST OKLAHOMA GAS CO LLC / BUTLER ARAPAHO GAS PLANT — high-priority violation on file	Pass	State
2025-08-19	ONEOK FIELD SERVICES CO LLC / WEST SMALLWOOD COMPRESSOR STATION	Pass	State
2025-08-18	ONEOK FIELD SERVICES CO LLC / MEYERS DURHAM 8 INCH LOOP COMPRSSOR ST	Pass	State
2025-07-31	MARKWEST OKLAHOMA GAS CO LLC / BUTLER ARAPAHO GAS PLANT — high-priority violation on file	Pass	State
2025-07-31	MARKWEST OKLAHOMA GAS CO LLC / BUTLER ARAPAHO GAS PLANT — high-priority violation on file	Pass	State
2025-07-31	MARKWEST OKLAHOMA GAS CO LLC / BUTLER ARAPAHO GAS PLANT — high-priority violation on file	Pass	State
2025-06-30	ONEOK FIELD SERVICES CO LLC / SMALLWOOD COMPRESSOR STATION	Pass	State
2025-06-30	ONEOK FIELD SERVICES CO LLC / SMALLWOOD COMPRESSOR STATION	Pass	State
2025-06-25	ONEOK FIELD SERVICES CO LLC / MEYERS DURHAM 8 INCH LOOP COMPRSSOR ST	Pass	State
2025-06-20	ONEOK FIELD SERVICES CO LLC / SMALLWOOD COMPRESSOR STATION	Pass	State
2025-06-12	BCE MACH LLC / GOUCHER 1 34H PAD	Pass	State
2025-04-17	DEVON ENERGY PRODUCTION CO LP / MALLARD PAD 1	Pass	State
2025-03-24	ONEOK FIELD SERVICES CO LLC / WEST SMALLWOOD COMPRESSOR STATION	Pass	State
2025-03-13	ONEOK FIELD SERVICES CO LLC / WILDHORSE LATERAL COMPRESSOR STATION	Pass	State
2025-02-24	DEVON ENERGY PRODUCTION CO LP / MALLARD PAD 1	Pass	State
2025-01-29	MARKWEST OKLAHOMA GAS CO LLC / CUSTER STABILIZATION STATION	Pass	State
2025-01-29	MARKWEST OKLAHOMA GAS CO LLC / CUSTER STABILIZATION STATION	Pass	State
2025-01-22	UNIT PETROLEUM CO / SARATOGA PAD	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 Custer county, OK, for 2025. It lists 20 stack tests recorded in 2025.