EPA Air · stack tests by county and year

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

47Stack 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

What stands out

Stack tests in Hamilton County, Ohio, fell from 58 in 2025, the previous year on file, to 47 in 2026.
The county’s file for stack tests holds 10 years of events, from 2017 through 2026.
Its 47 stack tests rank 10th of the 56 county cells in Ohio for 2026.
Its 47 stack tests are 2.5% of the 1,887 the state’s file holds for 2026.

Every line is computed by formula from the state’s stored file; nothing is estimated.

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

Date	Facility	Kind	Agency
2026-08-03	GM CEREALS PROPERTIES, INC.	Pass	State
2026-08-03	GM CEREALS PROPERTIES, INC.	Pass	State
2026-07-29	MILL CREEK WWTP	Pass	State
2026-07-21	MILL CREEK WWTP	Pass	State
2026-07-09	MIAMI FORT POWER COMPANY LLC	Pass	State
2026-07-09	MIAMI FORT POWER COMPANY LLC	Pass	State
2026-07-07	MIAMI FORT POWER COMPANY LLC	Pass	State
2026-06-29	UNIVERSITY OF CINCINNATI	Pass	State
2026-06-29	UNIVERSITY OF CINCINNATI	Pass	State
2026-06-29	UNIVERSITY OF CINCINNATI	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
2026-06-28	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
2026-06-28	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
2026-06-28	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-06-25	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-06-25	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-06-25	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-06-25	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-06-25	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-06-25	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-06-25	GE AEROSPACE EVENDALE PLANT	Pass	State
2026-06-25	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.

What this page shows

This page covers Clean Air Act facilities in the EPA air register with stack tests in Hamilton county, OH, for 2026. It lists 21 stack tests recorded in 2026.