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 |
|---|---|---|---|---|
| 2025-08-05 | WISCONSIN PUBLIC SERVICE CORP-WEST MARIN | PESHTIGO, Marinette, WI | Pass | State |
| 2025-08-04 | WPL - EDGEWATER GENERATING STATION | SHEBOYGAN, Taylor, WI | Pass | State |
| 2025-07-29 | GREEN BAY METRO SEWERAGE DIST | GREEN BAY, Brown, WI | Pass | State |
| 2025-07-29 | AHLSTROM NA SPECIALTY SOLUTIONS LLC — high-priority violation on file | KAUKAUNA, Ozaukee, WI | Pass | State |
| 2025-07-28 | GRAYMONT (WI) LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-07-28 | MANITOWOC PUBLIC UTILITIES | MANITOWOC, Manitowoc, WI | Pass | State |
| 2025-07-25 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2025-07-25 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2025-07-24 | KERRY INC — high-priority violation on file | RHINELANDER, Outagamie, WI | Fail | State |
| 2025-07-23 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2025-07-23 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2025-07-22 | GEORGIA PACIFIC BROADWAY LLC | GREEN BAY, Brown, WI | Pass | State |
| 2025-07-22 | MARTH WOOD SHAVINGS SUPPLY INC — high-priority violation on file | MARATHON, Marathon, WI | Pass | State |
| 2025-07-22 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2025-07-22 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2025-07-21 | KOHLER CO - METALS PROCESSING COMPLEX | KOHLER, Taylor, WI | Pass | State |
| 2025-07-15 | WMWI - TIMBERLINE TRAIL RECYCLING & DISPOSAL | WEYERHAEUSER, St. Croix, WI | Pass | State |
| 2025-07-15 | DOMTAR AW LLC — high-priority violation on file | NEKOOSA, Menominee, WI | Pass | State |
| 2025-07-14 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-07-14 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-07-14 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-07-14 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-07-14 | WPL - NEENAH GENERATING FACILITY — high-priority violation on file | NEENAH, Winnebago, WI | Pass | State |
| 2025-07-10 | MULLINS CHEESE INC — high-priority violation on file | MOSINEE, Marathon, WI | Pass | State |
| 2025-07-09 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-07-09 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-07-09 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2025-07-08 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-07-08 | AMCOR WISCONSIN, LLC - BOSCOBEL — high-priority violation on file | BOSCOBEL, Grant, WI | Pass | State |
| 2025-07-08 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2025-07-07 | DAIRYLAND POWER COOP ALMA SITE | ALMA, Buffalo, WI | Pass | State |
| 2025-07-07 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2025-07-07 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2025-07-02 | CRYSTAL FINISHING SYSTEMS INC | SCHOFIELD, Marathon, WI | Pass | State |
| 2025-07-01 | CARDINAL FG | PORTAGE, Columbia, WI | Pass | State |
| 2025-06-26 | GREEN BAY PACKAGING INC - GB MILL DIV | GREEN BAY, Brown, WI | Pass | State |
| 2025-06-25 | WE ENERGIES - VALLEY POWER PLANT | MILWAUKEE, Monroe, WI | Pass | State |
| 2025-06-25 | WPL - RIVERSIDE ENERGY CENTER | BELOIT, Rusk, WI | Pass | State |
| 2025-06-25 | NEENAH FOUNDRY COMPANY - NEENAH OPERATIONS (W2179) — high-priority violation on file | NEENAH, Wood, WI | Pass | State |
| 2025-06-24 | MG&E WEST CAMPUS COGENERATION FTY | MADISON, Dane, WI | Pass | State |
| 2025-06-24 | WPL - RIVERSIDE ENERGY CENTER | BELOIT, Rusk, WI | Pass | State |
| 2025-06-24 | WPL - RIVERSIDE ENERGY CENTER | BELOIT, Rusk, WI | Pass | State |
| 2025-06-24 | WPL - RIVERSIDE ENERGY CENTER | BELOIT, Rusk, WI | Pass | State |
| 2025-06-19 | DAIRYLAND POWER COOP ALMA SITE | ALMA, Buffalo, WI | Pass | State |
| 2025-06-17 | DAIRYLAND POWER COOP ALMA SITE | ALMA, Buffalo, WI | Pass | State |
| 2025-06-17 | WPL-SOUTH FOND DU LAC COMBUSTION TURBINE SITE | FOND DU LAC, Fond du Lac, WI | Pass | State |
| 2025-06-17 | WPL - RIVERSIDE ENERGY CENTER | BELOIT, Rusk, WI | Pass | State |
| 2025-06-17 | KOHLER COMPANY - VITREOUS PLANT | KOHLER, Taylor, WI | Pass | State |
| 2025-06-16 | WISCONSIN PUBLIC SERVICE CORPORATION - F | KAUKAUNA, Outagamie, WI | Pass | State |
| 2025-06-10 | MENDOTA MENTAL HEALTH INSTITUTE | MADISON, Dane, WI | Pass | State |
| 2025-06-10 | AZTALAN BIO | JOHNSON CREEK, Jefferson, WI | Pass | State |
| 2025-06-10 | ARDAGH GLASS INC — high-priority violation on file | BURLINGTON, Richland, WI | Pass | State |
| 2025-06-10 | EVONIK CORP | JANESVILLE, Rusk, WI | Pass | State |
| 2025-06-04 | WPL - SHEBOYGAN FALLS ENERGY FACILITY | PLYMOUTH, Taylor, WI | Pass | State |
| 2025-06-03 | COLUMBIA FOREST PRODUCTS-MELLEN | MELLEN, Ashland, WI | Pass | State |
| 2025-06-03 | XCEL ENERGY - FRENCH ISLAND GENERATING PLANT | LA CROSSE, La Crosse, WI | Fail | State |
| 2025-06-03 | WPL - SHEBOYGAN FALLS ENERGY FACILITY | PLYMOUTH, Taylor, WI | Pass | State |
| 2025-06-03 | WPL - SHEBOYGAN FALLS ENERGY FACILITY | PLYMOUTH, Taylor, WI | Pass | State |
| 2025-06-03 | WE ENERGIES - WHITEWATER GENERATING STATION | WHITEWATER, Jefferson, WI | Pass | State |
| 2025-06-03 | WE ENERGIES - WHITEWATER GENERATING STATION | WHITEWATER, Jefferson, WI | Pass | State |
| 2025-06-02 | AHLSTROM MOSINEE, LLC — high-priority violation on file | MOSINEE, Marathon, WI | Pass | State |
| 2025-05-28 | CHARTER STEEL | SAUKVILLE, Ozaukee, WI | Pass | State |
| 2025-05-27 | AMERICAN PACKAGING CORP - DE FOREST | DEFOREST, Dane, WI | Pass | State |
| 2025-05-27 | AHLSTROM NA SPECIALTY SOLUTIONS LLC — high-priority violation on file | KAUKAUNA, Ozaukee, WI | Pass | State |
| 2025-05-22 | U.S. ENERGY GREEN BAY FOX RIVER TERMINAL | GREEN BAY, Brown, WI | Pass | State |
| 2025-05-21 | AMERESCO JANESVILLE LLC | JANESVILLE, Rusk, WI | Pass | State |
| 2025-05-20 | WE ENERGIES PORT WASHINGTON GENERATING STATION | PORT WASHINGTON, Pepin, WI | Pass | State |
| 2025-05-16 | MMSD-JONES ISLAND WATER RECLAMATION FACILITY | MILWAUKEE, Monroe, WI | Pass | State |
| 2025-05-14 | PACKAGING CORPORATION OF AMERICA-TOMAHAW | TOMAHAWK, Lincoln, WI | Pass | State |
| 2025-05-14 | DOMTAR AW LLC — high-priority violation on file | NEKOOSA, Menominee, WI | Pass | State |
| 2025-05-13 | DOMTAR AW LLC — high-priority violation on file | NEKOOSA, Menominee, WI | Pass | State |
| 2025-05-12 | ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER | PARDEEVILLE, Columbia, WI | Pass | State |
| 2025-05-12 | ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER | PARDEEVILLE, Columbia, WI | Pass | State |
| 2025-05-12 | WISCONSIN ELECTRIC POWER COMPANY D/B/A WE ENERGIES-PARIS GENERATING STATION | UNION GROVE, Kenosha, WI | N/A | State |
| 2025-05-12 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-05-12 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-05-12 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-05-12 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-05-12 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-05-08 | AHLSTROM MOSINEE, LLC — high-priority violation on file | MOSINEE, Marathon, WI | Pass | State |
| 2025-05-07 | ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER | PARDEEVILLE, Columbia, WI | Pass | State |
| 2025-05-06 | ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER | PARDEEVILLE, Columbia, WI | Pass | State |
| 2025-05-06 | BRADY WORLDWIDE - FLORIST AVE PLT | GLENDALE, Monroe, WI | Pass | State |
| 2025-05-06 | BELMARK PLANT 6 | SHAWANO, Sheboygan, WI | Pass | State |
| 2025-05-05 | WE ENERGIES - VALLEY POWER PLANT | MILWAUKEE, Monroe, WI | Pass | State |
| 2025-04-28 | MMSD-JONES ISLAND WATER RECLAMATION FACILITY | MILWAUKEE, Monroe, WI | Pass | State |
| 2025-04-24 | WISCONSIN ALUMINUM FOUNDRY — high-priority violation on file | MANITOWOC, Manitowoc, WI | Pass | State |
| 2025-04-17 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-04-16 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-04-16 | ALDRICH CHEMICAL COMPANY LLC (DBA MILLIPORESIGMA) | SHEBOYGAN FALLS, Taylor, WI | Pass | State |
| 2025-04-15 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-04-14 | HOLSUM DAIRY - ELM — high-priority violation on file | HILBERT, Calumet, WI | Pass | State |
| 2025-04-14 | XCEL ENERGY - FRENCH ISLAND GENERATING PLANT | LA CROSSE, La Crosse, WI | Fail | State |
| 2025-04-14 | WISCONSIN PUBLIC SERVICE CORP-WEST MARIN | PESHTIGO, Marinette, WI | Pass | State |
| 2025-04-14 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2025-04-09 | WI DOA / UW-MADISON WALNUT ST PLT | MADISON, Dane, WI | Pass | State |
| 2025-04-08 | FLINT HILLS RESOURCES PINE BEND LLC - WAUPUN FACILITY | WAUPUN, Fond du Lac, WI | Pass | State |
| 2025-04-08 | BROWNTOWN FOUNDRY LLC — high-priority violation on file | BROWNTOWN, Green, WI | Pass | State |
| 2025-04-07 | UW MADISON CHARTER STREET HEATING PLANT (DOA) | MADISON, Dane, WI | Pass | State |
| 2025-04-03 | WAUPACA FOUNDRY, INC.-PLANT 4 | MARINETTE, Marinette, WI | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.