EPA Air · stack tests by county and year

Air-emissions stack tests in Hamilton County, Ohio, 2026

21Stack 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 Hamilton County, Ohio 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 Hamilton County facility page.

Hamilton County, Ohio, 2026

Air-emissions stack tests in Hamilton County, other years

Air-emissions stack tests recorded in Hamilton County, Ohio, 2026

Date	Facility	Kind	Agency
2026-06-28	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-06-28	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-06-28	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-06-28	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-05-29	MIAMI FORT POWER COMPANY LLC	Pass	State
2026-05-28	MIAMI FORT POWER COMPANY LLC	Pass	State
2026-05-28	MIAMI FORT POWER COMPANY LLC	Pass	State
2026-04-30	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-04-07	DTE ST. BERNARD, LLC	Pass	State
2026-04-07	DTE ST. BERNARD, LLC	Pass	State
2026-02-26	TRAMMO NITROGEN PRODUCTS, INC.	Pass	State
2026-02-05	MIAMI FORT POWER COMPANY LLC	Pass	State
2026-01-07	MILL CREEK WWTP	Pass	State
2026-01-07	MILL CREEK WWTP	Pass	State
2026-01-07	MILL CREEK WWTP	Pass	State
2026-01-07	MILL CREEK WWTP	Pass	State
2026-01-07	MILL CREEK WWTP	Pass	State
2026-01-07	MILL CREEK WWTP	Pass	State
2026-01-07	MILL CREEK WWTP	Pass	State
2026-01-07	MILL CREEK WWTP	Pass	State
2026-01-07	MILL CREEK WWTP	Pass	State

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