EPA Air · stack tests by state and year

Air-emissions stack tests in Ohio, 2026

1,474Stack 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 Ohio during 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Counties in Ohio, 2026

Ohio, other years

Air-emissions stack tests recorded in Ohio, 2026

Date	Facility	Where	Kind	Agency
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	EQM OLYMPUS MIDSTREAM LLC - BIG KAHUNA CS	BELMONT, Belmont, OH	Pass	State
2026-01-14	CRAIG MILLER PAD 952413	BEALLSVILLE, Monroe, OH	Pass	State
2026-01-14	CRAIG MILLER PAD 952413	BEALLSVILLE, Monroe, OH	Pass	State
2026-01-14	CRAIG MILLER PAD 952413	BEALLSVILLE, Monroe, OH	Pass	State
2026-01-13	PCS NITROGEN OHIO, L.P. — high-priority violation on file	LIMA, Allen, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	POET BIOREFINING - MARION, LLC	MARION, Marion, OH	Pass	State
2026-01-13	MICHIGAN METAL COATINGS	SIDNEY, Shelby, OH	Pass	State
2026-01-13	PYLES PAD 952757	BEALLSVILLE, Monroe, OH	Pass	State
2026-01-13	PYLES PAD 952757	BEALLSVILLE, Monroe, OH	Pass	State
2026-01-13	PYLES PAD 952757	BEALLSVILLE, Monroe, OH	Pass	State
2026-01-13	DIETRICH PAD 952432	CLARINGTON, Monroe, OH	Pass	State
2026-01-13	DIETRICH PAD 952432	CLARINGTON, Monroe, OH	Pass	State
2026-01-13	DIETRICH PAD 952432	CLARINGTON, Monroe, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-13	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-12	EOG RESOURCES, INC - SPARKMAN GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-12	EOG RESOURCES, INC - SPARKMAN GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-12	EOG RESOURCES, INC - SPARKMAN GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-12	EOG RESOURCES, INC. - WAGNER GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-12	EOG RESOURCES, INC. - WAGNER GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-12	EOG RESOURCES, INC. - WAGNER GY CEN PAD	CAMBRIDGE, Guernsey, OH	Pass	State
2026-01-09	BOLEN PAD 952350	SARDIS, Monroe, OH	Pass	State
2026-01-09	BOLEN PAD 952350	SARDIS, Monroe, OH	Pass	State
2026-01-09	BOLEN PAD 952350	SARDIS, Monroe, OH	Pass	State
2026-01-07	ROCKIES EXPRESS PIPELINE - WASHINGTON CH COMPRESSOR STA	WASHINGTON COURT HOUSE, Fayette, OH	Pass	State
2026-01-07	ROCKIES EXPRESS PIPELINE - WASHINGTON CH COMPRESSOR STA	WASHINGTON COURT HOUSE, Fayette, OH	Pass	State
2026-01-07	ROCKIES EXPRESS PIPELINE - WASHINGTON CH COMPRESSOR STA	WASHINGTON COURT HOUSE, Fayette, OH	Pass	State
2026-01-07	ROCKIES EXPRESS PIPELINE - COLUMBUS COMPRESSOR STATION — high-priority violation on file	ASHVILLE, Pickaway, OH	Pass	State
2026-01-07	ROCKIES EXPRESS PIPELINE - COLUMBUS COMPRESSOR STATION — high-priority violation on file	ASHVILLE, Pickaway, OH	Pass	State
2026-01-07	ROCKIES EXPRESS PIPELINE - COLUMBUS COMPRESSOR STATION — high-priority violation on file	ASHVILLE, Pickaway, OH	Pass	State
2026-01-07	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-07	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-07	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-07	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-07	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-07	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-07	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-07	WRIGHT-PATTERSON AIR FORCE BASE	FAIRBORN, Greene, OH	Pass	State
2026-01-07	MILL CREEK WWTP	CINCINNATI, Hamilton, OH	Pass	State
2026-01-07	MILL CREEK WWTP	CINCINNATI, Hamilton, OH	Pass	State
2026-01-07	MILL CREEK WWTP	CINCINNATI, Hamilton, OH	Pass	State
2026-01-07	MILL CREEK WWTP	CINCINNATI, Hamilton, OH	Pass	State
2026-01-07	MILL CREEK WWTP	CINCINNATI, Hamilton, OH	Pass	State
2026-01-07	MILL CREEK WWTP	CINCINNATI, Hamilton, OH	Pass	State
2026-01-07	MILL CREEK WWTP	CINCINNATI, Hamilton, OH	Pass	State
2026-01-07	MILL CREEK WWTP	CINCINNATI, Hamilton, OH	Pass	State
2026-01-07	MILL CREEK WWTP	CINCINNATI, Hamilton, OH	Pass	State
2026-01-06	VERTIV CORPORATION	DELAWARE, Delaware, OH	Pass	State
2026-01-06	ROCKIES EXPRESS PIPELINE LLC- CHANDLERSVILLE CS	PHILO, Muskingum, OH	Pass	State
2026-01-06	ROCKIES EXPRESS PIPELINE LLC- CHANDLERSVILLE CS	PHILO, Muskingum, OH	Pass	State
2026-01-06	ROCKIES EXPRESS PIPELINE LLC- CHANDLERSVILLE CS	PHILO, Muskingum, OH	Pass	State
2026-01-06	EOG RESOURCES INC - GEMSBOK CTB	BELLE VALLEY, Noble, OH	Pass	State
2026-01-06	EOG RESOURCES INC - GEMSBOK CTB	BELLE VALLEY, Noble, OH	Pass	State
2026-01-06	EOG RESOURCES INC - GEMSBOK CTB	BELLE VALLEY, Noble, OH	Pass	State

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