EPA Air · stack tests by state and year

Air-emissions stack tests in Wisconsin, 2026

135Stack 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 Wisconsin 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 Wisconsin, 2026

Wisconsin, other years

Air-emissions stack tests recorded in Wisconsin, 2026

Date	Facility	Where	Kind	Agency
2026-03-17	RICHLAND CENTER RENEWABLE ENERGY	RICHLAND CENTER, Rock, WI	Pass	State
2026-03-16	AHLSTROM MOSINEE, LLC — high-priority violation on file	MOSINEE, Marathon, WI	Pass	State
2026-03-14	U.S. ENERGY MILWAUKEE JONES ISLAND TERMINAL	MILWAUKEE, Monroe, WI	Pass	State
2026-03-09	BROWNTOWN FOUNDRY LLC — high-priority violation on file	BROWNTOWN, Green, WI	Pass	State
2026-03-06	FML	BELOIT, Rusk, WI	Fail	State
2026-03-04	BADGER STATE ETHANOL, INC. — high-priority violation on file	MONROE, Green, WI	Pass	State
2026-03-03	GRAYMONT WESTERN LIME - EDEN	EDEN, Fond du Lac, WI	Pass	State
2026-03-03	UNITED ENERGY NECEDAH LLC — high-priority violation on file	NECEDAH, Juneau, WI	Pass	State
2026-02-27	GRAYMONT (WI) LLC — high-priority violation on file	SUPERIOR, Douglas, WI	Pass	State
2026-02-24	ANR PIPELINE CO - KEWASKUM COMPRESSOR ST	ADELL, Taylor, WI	Pass	State
2026-02-23	AHLSTROM NA SPECIALTY SOLUTIONS LLC — high-priority violation on file	KAUKAUNA, Ozaukee, WI	Pass	State
2026-02-17	BADGER MINING CORP-TAYLOR PLANT	TAYLOR, Jackson, WI	Pass	State
2026-02-11	CRYSTAL FINISHING SYSTEMS INC	SCHOFIELD, Marathon, WI	Pass	State
2026-02-11	BRADY WORLDWIDE - FLORIST AVE PLT	GLENDALE, Monroe, WI	Pass	State
2026-02-10	NORTHERN STATES PWR CO WHEATON GEN STA	EAU CLAIRE, Chippewa, WI	Fail	State
2026-02-10	UNITED WISCONSIN GRAIN PRODUCERS, LLC — high-priority violation on file	FRIESLAND, Columbia, WI	Pass	State
2026-02-10	WI DOA / UW-MADISON WALNUT ST PLT	MADISON, Dane, WI	Pass	State
2026-02-10	ITU ABSORBTECH	NEENAH, Wood, WI	Pass	State
2026-02-09	UW MADISON CHARTER STREET HEATING PLANT (DOA)	MADISON, Dane, WI	Pass	State
2026-02-05	SUPERIOR REFINING COMPANY LLC — high-priority violation on file	SUPERIOR, Douglas, WI	Pass	State
2026-02-04	SUPERIOR REFINING COMPANY LLC — high-priority violation on file	SUPERIOR, Douglas, WI	Pass	State
2026-02-04	SUPERIOR REFINING COMPANY LLC — high-priority violation on file	SUPERIOR, Douglas, WI	Pass	State
2026-02-03	SUPERIOR REFINING COMPANY LLC — high-priority violation on file	SUPERIOR, Douglas, WI	Pass	State
2026-02-03	XCEL ENERGY - FRENCH ISLAND GENERATING PLANT	LA CROSSE, La Crosse, WI	Pass	State
2026-02-02	NORTHERN STATES PWR CO WHEATON GEN STA	EAU CLAIRE, Chippewa, WI	Pass	State
2026-01-27	MICROSOFT CORPORATION - MKE 3B DATA CENTER	MOUNT PLEASANT, Richland, WI	N/A	State
2026-01-27	DISCOVERY ENERGY LLC	MOSEL, Taylor, WI	Pass	State
2026-01-20	ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER	PARDEEVILLE, Columbia, WI	Pass	State
2026-01-20	BIG RIVER RESOURCES BOYCEVILLE LLC	BOYCEVILLE, Dunn, WI	Pass	State
2026-01-20	KOHLER CO - METALS PROCESSING COMPLEX	KOHLER, Taylor, WI	Pass	State
2026-01-20	ANR PIPELINE CO - WEYAUWEGA COMPRESSOR STATION	WEYAUWEGA, Waushara, WI	Pass	State
2026-01-19	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-01-19	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-01-13	ANR PIPELINE CO - KEWASKUM COMPRESSOR ST	ADELL, Taylor, WI	Pass	State
2026-01-06	SILGAN CONTAINERS MFG CORP - PLOVER — high-priority violation on file	PLOVER, Price, WI	Pass	State

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