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
2026-07-21	BADGER STATE ETHANOL, INC. — high-priority violation on file	MONROE, Green, WI	Pass	State
2026-07-21	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-07-15	CRYSTAL FINISHING SYSTEMS INC	SCHOFIELD, Marathon, WI	Pass	State
2026-07-14	CARMEUSE LIME AND STONE - ROCKWELL OPERATION — high-priority violation on file	MANITOWOC, Manitowoc, WI	Pass	State
2026-07-13	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-07-13	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-07-13	WPL - NEENAH GENERATING FACILITY — high-priority violation on file	NEENAH, Winnebago, WI	Pass	State
2026-07-08	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-07-07	WPL - SHEBOYGAN FALLS ENERGY FACILITY	PLYMOUTH, Taylor, WI	Pass	State
2026-07-06	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-07-06	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-07-06	WE ENERGIES - VALLEY POWER PLANT	MILWAUKEE, Monroe, WI	Pass	State
2026-06-30	WI PUBLIC SERVICE WESTON POWER PLANT	KRONENWETTER, Marathon, WI	Pass	State
2026-06-30	VORTEQ COIL FINISHERS — high-priority violation on file	OCONOMOWOC, Waupaca, WI	Pass	State
2026-06-29	WI PUBLIC SERVICE WESTON POWER PLANT	KRONENWETTER, Marathon, WI	Pass	State
2026-06-25	GREEN BAY PACKAGING INC - GB MILL DIV	GREEN BAY, Brown, WI	Pass	State
2026-06-25	DAIRYLAND BIOGAS - AGRA RNG-GTL PROJECT — high-priority violation on file	NEW FRANKEN, Brown, WI	Pass	State
2026-06-24	HYDRITE CHEMICAL CO. — high-priority violation on file	COTTAGE GROVE, Dane, WI	N/A	State
2026-06-24	WI PUBLIC SERVICE WESTON POWER PLANT	KRONENWETTER, Marathon, WI	Pass	State
2026-06-24	WPL - EDGEWATER GENERATING STATION	SHEBOYGAN, Taylor, WI	Pass	State
2026-06-23	MG&AMP;E WEST CAMPUS COGENERATION FTY	MADISON, Dane, WI	Pass	State
2026-06-23	WI PUBLIC SERVICE WESTON POWER PLANT	KRONENWETTER, Marathon, WI	Pass	State
2026-06-23	WI PUBLIC SERVICE WESTON POWER PLANT	KRONENWETTER, Marathon, WI	Pass	State
2026-06-22	UNITED ENERGY NECEDAH LLC — high-priority violation on file	NECEDAH, Juneau, WI	Pass	State
2026-06-22	WASTE MANAGEMENT OF WISCONSIN, INC. - PHEASANT RUN RECYCLING AND DISPOSAL FACILI	BRISTOL, Kenosha, WI	Pass	State
2026-06-22	WI PUBLIC SERVICE WESTON POWER PLANT	KRONENWETTER, Marathon, WI	Pass	State
2026-06-22	WMWI - METRO RECYCLING &AMP; DISPOSAL	FRANKLIN, Monroe, WI	Pass	State
2026-06-22	WMWI - METRO RECYCLING &AMP; DISPOSAL	FRANKLIN, Monroe, WI	Pass	State
2026-06-22	WPL - EDGEWATER GENERATING STATION	SHEBOYGAN, Taylor, WI	Pass	State
2026-06-18	DAIRYLAND POWER COOP ALMA SITE	ALMA, Buffalo, WI	Pass	State
2026-06-18	MENDOTA MENTAL HEALTH INSTITUTE	MADISON, Dane, WI	Pass	State
2026-06-18	MOLSON COORS USA LLC	MILWAUKEE, Monroe, WI	Pass	State
2026-06-17	CROWN CORK AND SEAL PLANT 66	LA CROSSE, La Crosse, WI	Pass	State
2026-06-16	DAIRYLAND POWER COOP ALMA SITE	ALMA, Buffalo, WI	Pass	State
2026-06-16	APOGEE WAUSAU GROUP INC LINETEC DIVISION — high-priority violation on file	WAUSAU, Marathon, WI	Pass	State
2026-06-15	PACKAGING CORPORATION OF AMERICA-TOMAHAW	TOMAHAWK, Lincoln, WI	Pass	State
2026-06-13	WISCONSIN ELECTRIC POWER COMPANY D/B/A WE ENERGIES-PARIS GENERATING STATION	UNION GROVE, Kenosha, WI	N/A	State
2026-06-11	MERCURY MARINE - PLANTS 3,4,10,12,15,17,	FOND DU LAC, Fond du Lac, WI	Pass	State
2026-06-10	WPL-SOUTH FOND DU LAC COMBUSTION TURBINE SITE	FOND DU LAC, Fond du Lac, WI	Pass	State
2026-06-09	WISCONSIN ELECTRIC POWER COMPANY (DBA WE ENERGIES) - ROTHSCHILD BIOMASS COGENERA — high-priority violation on file	ROTHSCHILD, Marathon, WI	Pass	State
2026-06-09	WISCONSIN PUBLIC SERVICE CORPORATION - F	KAUKAUNA, Outagamie, WI	Pass	State
2026-06-09	WISCONSIN PUBLIC SERVICE CORPORATION - F	KAUKAUNA, Outagamie, WI	Pass	State
2026-06-09	WPL - RIVERSIDE ENERGY CENTER	BELOIT, Rusk, WI	Pass	State
2026-06-09	WPL - RIVERSIDE ENERGY CENTER	BELOIT, Rusk, WI	Pass	State
2026-06-05	WE ENERGIES - WHITEWATER GENERATING STATION	WHITEWATER, Jefferson, WI	Pass	State
2026-06-03	CHARTER AARROWCAST	SHAWANO, Sheboygan, WI	Pass	State
2026-06-02	PPG INDUSTRIES — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-06-02	ARDAGH GLASS INC — high-priority violation on file	BURLINGTON, Richland, WI	Pass	State
2026-06-02	DOMTAR AW LLC — high-priority violation on file	NEKOOSA, Menominee, WI	Pass	State
2026-05-27	AMRIZE BUILDING ENVELOPE LLC	DEFOREST, Dane, WI	Pass	State
2026-05-27	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-05-26	MARSHFIELD UTILITIES COMBUSTION TURBINE	MARSHFIELD, Wood, WI	Pass	State
2026-05-19	AMERICAN PACKAGING CORP - DE FOREST	DEFOREST, Dane, WI	Pass	State
2026-05-19	WE ENERGIES PORT WASHINGTON GENERATING STATION	PORT WASHINGTON, Pepin, WI	Pass	State
2026-05-19	KOHLER CO - METALS PROCESSING COMPLEX	KOHLER, Taylor, WI	Pass	State
2026-05-15	WPL - SHEBOYGAN FALLS ENERGY FACILITY	PLYMOUTH, Taylor, WI	Pass	State
2026-05-15	WPL - SHEBOYGAN FALLS ENERGY FACILITY	PLYMOUTH, Taylor, WI	Pass	State
2026-05-14	MICROSOFT CORPORATION - MKE 3B DATA CENTER	MOUNT PLEASANT, Richland, WI	Pass	State
2026-05-11	PACKAGING CORPORATION OF AMERICA-TOMAHAW	TOMAHAWK, Lincoln, WI	Pass	State
2026-05-11	WPL - RIVERSIDE ENERGY CENTER	BELOIT, Rusk, WI	Pass	State
2026-05-05	BADGER STATE ETHANOL, INC. — high-priority violation on file	MONROE, Green, WI	Pass	State
2026-05-05	NEENAH FOUNDRY COMPANY - NEENAH OPERATIONS (W2179) — high-priority violation on file	NEENAH, Wood, WI	Pass	State
2026-05-05	AMCOR FILMS	OSHKOSH, Wood, WI	Pass	State
2026-05-04	WPL - NEENAH GENERATING FACILITY — high-priority violation on file	NEENAH, Winnebago, WI	Pass	State
2026-05-04	WPL - NEENAH GENERATING FACILITY — high-priority violation on file	NEENAH, Winnebago, WI	Pass	State
2026-04-28	HYDRITE CHEMICAL CO. — high-priority violation on file	COTTAGE GROVE, Dane, WI	Pass	State
2026-04-27	MMSD-JONES ISLAND WATER RECLAMATION FACILITY	MILWAUKEE, Monroe, WI	Pass	State
2026-04-22	PLYMOUTH FOAM INCORPORATED — high-priority violation on file	PLYMOUTH, Sheboygan, WI	Pass	State
2026-04-22	QUAD/GRAPHICS INC	SUSSEX, Waupaca, WI	Pass	State
2026-04-21	GREEN BAY METRO SEWERAGE DIST	GREEN BAY, Brown, WI	Pass	State
2026-04-21	VIRESCO TURTLE LAKE — high-priority violation on file	TURTLE LAKE, Barron, WI	Pass	State
2026-04-20	PROAMPAC MENASHA — high-priority violation on file	MENASHA, Wood, WI	Pass	State
2026-04-16	WASTE MANAGEMENT OF WISCONSIN, INC. - PHEASANT RUN RECYCLING AND DISPOSAL FACILI	BRISTOL, Kenosha, WI	Pass	State
2026-04-15	WMWI - OMEGA HILLS LANDFILL	GERMANTOWN, Waukesha, WI	Pass	State
2026-04-14	ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER	PARDEEVILLE, Columbia, WI	Pass	State
2026-04-14	DEER TRACK PARK LANDFILL	WATERTOWN, Jefferson, WI	Pass	State
2026-04-13	ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER	PARDEEVILLE, Columbia, WI	Pass	State
2026-04-13	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-04-13	WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file	OAK CREEK, Monroe, WI	Pass	State
2026-04-13	WE ENERGIES - VALLEY POWER PLANT	MILWAUKEE, Monroe, WI	Pass	State
2026-04-09	SUPERIOR REFINING COMPANY LLC — high-priority violation on file	SUPERIOR, Douglas, WI	Pass	State
2026-04-09	SUPERIOR REFINING COMPANY LLC — high-priority violation on file	SUPERIOR, Douglas, WI	Pass	State
2026-04-09	ARDAGH GLASS INC — high-priority violation on file	BURLINGTON, Richland, WI	N/A	State
2026-04-08	SUPERIOR REFINING COMPANY LLC — high-priority violation on file	SUPERIOR, Douglas, WI	Pass	State
2026-04-07	ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER	PARDEEVILLE, Columbia, WI	Pass	State
2026-04-07	WI DOA / UW-MADISON WALNUT ST PLT	MADISON, Dane, WI	Pass	State
2026-04-07	SUPERIOR REFINING COMPANY LLC — high-priority violation on file	SUPERIOR, Douglas, WI	Pass	State
2026-04-07	XCEL ENERGY - FRENCH ISLAND GENERATING PLANT	LA CROSSE, La Crosse, WI	Pass	State
2026-04-07	AHLSTROM MOSINEE, LLC — high-priority violation on file	MOSINEE, Marathon, WI	Pass	State
2026-04-06	ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER	PARDEEVILLE, Columbia, WI	Pass	State
2026-04-02	WISCONSIN ALUMINUM FOUNDRY — high-priority violation on file	MANITOWOC, Manitowoc, WI	Fail	State
2026-04-02	WAUPACA FOUNDRY, INC.-PLANT 4	MARINETTE, Marinette, WI	Pass	State
2026-04-02	WAUPACA FOUNDRY INC - PLANT 1	WAUPACA, Waushara, WI	Pass	State
2026-03-31	AHLSTROM COATED PRODUCTS LLC	RHINELANDER, Outagamie, WI	Pass	State
2026-03-31	US PAPER MILLS CORP - MENASHA MILL	MENASHA, Wood, WI	Pass	State
2026-03-27	MCKINLEY PAPER AND PACKAGING COMPANY — high-priority violation on file	COMBINED LOCKS, Ozaukee, WI	Pass	State
2026-03-26	CHARTER STEEL	SAUKVILLE, Ozaukee, WI	Pass	State
2026-03-23	BELMARK INC - PLANT 3	DE PERE, Brown, WI	Pass	State
2026-03-17	AHLSTROM STEVENS POINT LLC — high-priority violation on file	STEVENS POINT, Price, WI	Pass	State
2026-03-17	S.C. JOHNSON & SON, INC	STURTEVANT, Racine, WI	Pass	State

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