EPA Air · stack tests by state and year
Air-emissions stack tests in Wisconsin, 2025
- 245Stack 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 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Wisconsin, 2025
- Monroe County 25
- Marathon County 22
- Rusk County 14
- Douglas County 14
- Dane County 13
- Taylor County 12
- Brown County 12
- Columbia County 9
- Ozaukee County 8
- Barron County 7
- Fond du Lac County 7
- Manitowoc County 6
- La Crosse County 6
- Outagamie County 6
- Waushara County 6
- Jefferson County 5
- Marinette County 5
- Kenosha County 4
- Juneau County 4
- Green County 4
- Buffalo County 4
- Waupaca County 3
- Wood County 3
- Menominee County 3
- Winnebago County 3
- Richland County 3
- Dunn County 3
- Ashland County 3
- Calumet County 3
- Kewaunee County 3
Wisconsin, other years
Air-emissions stack tests recorded in Wisconsin, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-19 | CUMBERLAND MUNICIPAL UTILITY | CUMBERLAND, Barron, WI | Pass | State |
| 2025-12-16 | JENNIE-O TURKEY STORE INC. | BARRON, Barron, WI | Pass | State |
| 2025-12-15 | WISCONSIN ALUMINUM FOUNDRY — high-priority violation on file | MANITOWOC, Manitowoc, WI | Fail | State |
| 2025-12-11 | UNIROYAL GLOBAL ENGINEERED PRODUCTS LLC — high-priority violation on file | STOUGHTON, Dane, WI | Pass | State |
| 2025-12-10 | U.S. ENERGY MADISON SOUTH TERMINAL | MC FARLAND, Dane, WI | Pass | State |
| 2025-12-09 | GREEN MEADOWS RNG, LLC | CHILTON, Calumet, WI | Pass | State |
| 2025-12-09 | CASCADES TISSUE GROUP - WI INC | EAU CLAIRE, Eau Claire, WI | Pass | State |
| 2025-12-09 | MCKINLEY PAPER AND PACKAGING COMPANY — high-priority violation on file | COMBINED LOCKS, Ozaukee, WI | Pass | State |
| 2025-12-05 | WI DOA / UW-RIVER FALLS POWER PLT | RIVER FALLS, Polk, WI | Pass | State |
| 2025-12-04 | ANR PIPELINE CO - JANESVILLE COMPRESSOR | JANESVILLE, Rusk, WI | Pass | State |
| 2025-12-03 | ANR PIPELINE CO - JANESVILLE COMPRESSOR | JANESVILLE, Rusk, WI | Pass | State |
| 2025-12-02 | GREEN BAY METRO SEWERAGE DIST | GREEN BAY, Brown, WI | Pass | State |
| 2025-12-02 | ANR PIPELINE CO - JANESVILLE COMPRESSOR | JANESVILLE, Rusk, WI | Pass | State |
| 2025-11-25 | QUAD/GRAPHICS INC | SUSSEX, Waupaca, WI | Pass | State |
| 2025-11-19 | MOLSON COORS USA LLC | MILWAUKEE, Monroe, WI | Pass | State |
| 2025-11-18 | GRAYMONT WESTERN LIME INC — high-priority violation on file | GREEN BAY, Brown, WI | Pass | State |
| 2025-11-18 | AMCOR PACKAGING INC, - LANCASTER — high-priority violation on file | LANCASTER, Grant, WI | Pass | State |
| 2025-11-12 | GRASSLAND DAIRY PRODUCTS INC | GREENWOOD, Clark, WI | Pass | State |
| 2025-11-11 | XCEL ENERGY - FRENCH ISLAND GENERATING PLANT | LA CROSSE, La Crosse, WI | Pass | State |
| 2025-11-11 | ASHLEY FURNITURE INDUSTRIES LLC — high-priority violation on file | ARCADIA, Vernon, WI | Fail | State |
| 2025-11-05 | MASTERMOLD LLC PLT 3 MAUSTON | MAUSTON, Juneau, WI | Pass | State |
| 2025-11-05 | WAUPACA FOUNDRY INC - PLANT 1 | WAUPACA, Waushara, WI | Pass | State |
| 2025-11-04 | BARRON COUNTY WASTE TO ENERGY AND RECYCLING FACILITY — high-priority violation on file | ALMENA, Barron, WI | Pass | State |
| 2025-11-04 | BARRON COUNTY WASTE TO ENERGY AND RECYCLING FACILITY — high-priority violation on file | ALMENA, Barron, WI | Pass | State |
| 2025-11-04 | GREEN BAY PACKAGING INC - GB MILL DIV | GREEN BAY, Brown, WI | Pass | State |
| 2025-11-04 | KERRY INC — high-priority violation on file | RHINELANDER, Outagamie, WI | Pass | State |
| 2025-11-04 | ARDAGH GLASS INC — high-priority violation on file | BURLINGTON, Richland, WI | Pass | State |
| 2025-11-04 | WAUPACA FOUNDRY INC - PLANT 2 & 3 | WAUPACA, Waushara, WI | Pass | State |
| 2025-10-28 | ATMUS FILTRATION INC. - NEILLSVILLE PLANT | NEILLSVILLE, Clark, WI | Pass | State |
| 2025-10-27 | WISCONSIN ELECTRIC POWER COMPANY D/B/A WE ENERGIES-PARIS GENERATING STATION | UNION GROVE, Kenosha, WI | Pass | State |
| 2025-10-27 | WISCONSIN ELECTRIC POWER COMPANY D/B/A WE ENERGIES-PARIS GENERATING STATION | UNION GROVE, Kenosha, WI | Pass | State |
| 2025-10-21 | UW MADISON CHARTER STREET HEATING PLANT (DOA) | MADISON, Dane, WI | Pass | State |
| 2025-10-21 | GREDE LLC - LIBERTY — high-priority violation on file | WAUWATOSA, Monroe, WI | Pass | State |
| 2025-10-20 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-10-20 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-10-15 | ANR PIPELINE CO - JANESVILLE COMPRESSOR | JANESVILLE, Rusk, WI | Pass | State |
| 2025-10-14 | MANITOWOC PUBLIC UTILITIES | MANITOWOC, Manitowoc, WI | Pass | State |
| 2025-10-14 | INDECK LADYSMITH LLC | LADYSMITH, Rusk, WI | Pass | State |
| 2025-10-14 | NEENAH FOUNDRY COMPANY - NEENAH OPERATIONS (W2179) — high-priority violation on file | NEENAH, Wood, WI | Pass | State |
| 2025-10-13 | AHLSTROM RHINELANDER LLC | RHINELANDER, Outagamie, WI | Pass | State |
| 2025-10-13 | AHLSTROM RHINELANDER LLC | RHINELANDER, Outagamie, WI | Pass | State |
| 2025-10-10 | WPL - SHEBOYGAN FALLS ENERGY FACILITY | PLYMOUTH, Taylor, WI | Pass | State |
| 2025-10-09 | ELROY MUNICIPAL ELECTRIC UTILITY (EMEU) | ELROY, Juneau, WI | Pass | State |
| 2025-10-09 | AMCOR WISCONSIN, LLC - NEW LONDON | NEW LONDON, Ozaukee, WI | Pass | State |
| 2025-10-09 | CHARTER STEEL | SAUKVILLE, Ozaukee, WI | Pass | State |
| 2025-10-09 | WPL - NEENAH GENERATING FACILITY — high-priority violation on file | NEENAH, Winnebago, WI | Pass | State |
| 2025-10-07 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-10-07 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-10-07 | AMCOR PACKAGING, INC. - OSHKOSH NORTH | OSHKOSH, Wood, WI | Pass | State |
| 2025-10-06 | WPL - SHEBOYGAN FALLS ENERGY FACILITY | PLYMOUTH, Taylor, WI | Pass | State |
| 2025-10-06 | WPL - NEENAH GENERATING FACILITY — high-priority violation on file | NEENAH, Winnebago, WI | Pass | State |
| 2025-10-02 | NEENAH FOUNDRY COMPANY - DE PERE OPERATIONS | DE PERE, Brown, WI | Pass | State |
| 2025-10-01 | AMERICAN PACKAGING CORP | COLUMBUS, Columbia, WI | Pass | State |
| 2025-09-30 | WISCONSIN ELECTRIC POWER COMPANY (DBA WE ENERGIES) - ROTHSCHILD BIOMASS COGENERA — high-priority violation on file | ROTHSCHILD, Marathon, WI | Pass | State |
| 2025-09-29 | QUAD/GRAPHICS INC - LOMIRA | LOMIRA, Dodge, WI | Pass | State |
| 2025-09-29 | WMWI - METRO RECYCLING & DISPOSAL | FRANKLIN, Monroe, WI | Pass | State |
| 2025-09-29 | ARCADIA MUNICIPAL ELECTRIC | ARCADIA, Vernon, WI | Pass | State |
| 2025-09-24 | WAUPACA FOUNDRY, INC.-PLANT 4 | MARINETTE, Marinette, WI | Pass | State |
| 2025-09-24 | WAUPACA FOUNDRY INC - PLANT 1 | WAUPACA, Waushara, WI | Pass | State |
| 2025-09-24 | WAUPACA FOUNDRY INC - PLANT 2 & 3 | WAUPACA, Waushara, WI | Pass | State |
| 2025-09-23 | CUMBERLAND MUNICIPAL UTILITY | CUMBERLAND, Barron, WI | Pass | State |
| 2025-09-23 | 3M PRAIRIE DU CHIEN BUILDING 50 | PRAIRIE DU CHIEN, Crawford, WI | Pass | State |
| 2025-09-23 | ROCKGEN ENERGY CENTER — high-priority violation on file | CAMBRIDGE, Dane, WI | Pass | State |
| 2025-09-23 | GRAYMONT WESTERN LIME - EDEN | EDEN, Fond du Lac, WI | Pass | State |
| 2025-09-22 | PROCTER & GAMBLE PAPER PRODUCTS CO | GREEN BAY, Brown, WI | Pass | State |
| 2025-09-17 | 3M PRAIRIE DU CHIEN BUILDING 50 | PRAIRIE DU CHIEN, Crawford, WI | Pass | State |
| 2025-09-17 | NEW LISBON ELECTRIC & WATER DEPT | NEW LISBON, Juneau, WI | Pass | State |
| 2025-09-15 | NORTHERN STATES PWR CO WHEATON GEN STA | EAU CLAIRE, Chippewa, WI | Pass | State |
| 2025-09-15 | MULLINS CHEESE INC — high-priority violation on file | MOSINEE, Marathon, WI | Pass | State |
| 2025-09-11 | ROCK ROAD COMPANIES, INC. - TOWNLINE PIT | BELOIT, Rock, WI | Pass | State |
| 2025-09-09 | GRAYMONT (WI) LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-09-09 | BROWNTOWN FOUNDRY LLC — high-priority violation on file | BROWNTOWN, Green, WI | Pass | State |
| 2025-09-09 | APPLETON GRP LLC — high-priority violation on file | SOUTH MILWAUKEE, Monroe, WI | Pass | State |
| 2025-09-09 | KOHLER CO - METALS PROCESSING COMPLEX | KOHLER, Taylor, WI | Pass | State |
| 2025-09-04 | ANR PIPELINE CO.-MOUNTAIN COMPRESSOR STA | SURING, Oconto, WI | Pass | State |
| 2025-08-27 | XCEL ENERGY - FRENCH ISLAND GENERATING PLANT | LA CROSSE, La Crosse, WI | Pass | State |
| 2025-08-26 | MG&E WEST CAMPUS COGENERATION FTY | MADISON, Dane, WI | Pass | State |
| 2025-08-26 | DANE RENEWABLE ENERGY LLC | SUN PRAIRIE, Dane, WI | N/A | State |
| 2025-08-26 | 3M - MENOMONIE PLANT — high-priority violation on file | MENOMONIE, Dunn, WI | Pass | State |
| 2025-08-25 | NEW CHESTER RENEWABLE ENERGY LLC | GRAND MARSH, Adams, WI | Pass | State |
| 2025-08-24 | ROSENDALE RENEWABLE ENERGY, LLC | ROSENDALE, Fond du Lac, WI | Pass | State |
| 2025-08-23 | CALUMET RENEWABLE ENERGY, LLC - PAGELS PONDEROSA FACILITY | KEWAUNEE, Kewaunee, WI | Pass | State |
| 2025-08-22 | KEWAUNEE RENEWABLE ENERGY LLC | CASCO, Kewaunee, WI | Pass | State |
| 2025-08-21 | FLINT HILLS RESOURCES PINE BEND LLC - WAUPUN FACILITY | WAUPUN, Fond du Lac, WI | Pass | State |
| 2025-08-21 | CALUMET RENEWABLE ENERGY - DAIRY DREAMS FACILITY — high-priority violation on file | CASCO, Kewaunee, WI | Pass | State |
| 2025-08-20 | DAIRYLAND POWER COOP ALMA SITE | ALMA, Buffalo, WI | Pass | State |
| 2025-08-20 | CALUMET RENEWABLE ENERGY LLC - GROTEGUT/MAPLE LEAF FACILITY | NEWTON, Manitowoc, WI | Pass | State |
| 2025-08-19 | BARRON COUNTY WASTE TO ENERGY AND RECYCLING FACILITY — high-priority violation on file | ALMENA, Barron, WI | Pass | State |
| 2025-08-19 | BARRON COUNTY WASTE TO ENERGY AND RECYCLING FACILITY — high-priority violation on file | ALMENA, Barron, WI | Fail | State |
| 2025-08-19 | BUCKHORN RNG, LLC | UNITY, Marathon, WI | Pass | State |
| 2025-08-19 | GREDE LLC - LIBERTY — high-priority violation on file | WAUWATOSA, Monroe, WI | Pass | State |
| 2025-08-19 | FLINT HILLS RESOURCES PINE BEND, LLC - M | MILWAUKEE, Milwaukee, WI | Pass | State |
| 2025-08-14 | NEENAH FOUNDRY COMPANY - DE PERE OPERATIONS | DE PERE, Brown, WI | Fail | State |
| 2025-08-12 | WISCONSIN ELECTRIC POWER COMPANY (DBA WE ENERGIES) - ROTHSCHILD BIOMASS COGENERA — high-priority violation on file | ROTHSCHILD, Marathon, WI | Pass | State |
| 2025-08-12 | AHLSTROM NA SPECIALTY SOLUTIONS LLC — high-priority violation on file | KAUKAUNA, Ozaukee, WI | Pass | State |
| 2025-08-11 | QUAD/GRAPHICS INC | SUSSEX, Waupaca, WI | Pass | State |
| 2025-08-07 | WPL - EDGEWATER GENERATING STATION | SHEBOYGAN, Taylor, WI | Pass | State |
| 2025-08-06 | WE ENERGIES - WHITEWATER GENERATING STATION | WHITEWATER, Jefferson, WI | Pass | State |
| 2025-08-05 | XCEL ENERGY BAY FRONT GENERATING STATION | ASHLAND, Ashland, WI | Pass | State |
| 2025-08-05 | WI PUBLIC SERVICE CORP - JP PULLIAM PLANT | GREEN BAY, Brown, WI | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.