EPA Air · stack tests by state and year
Air-emissions stack tests in Iowa, 2025
- 500Stack 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 Iowa 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 Iowa, 2025
- Linn County 45
- Muscatine County 39
- Webster County 23
- Hardin County 22
- Black Hawk County 21
- Marion County 21
- Kossuth County 19
- Story County 17
- Polk County 16
- Cerro Gordo County 15
- Chickasaw County 13
- Johnson County 11
- Mitchell County 10
- Guthrie County 10
- Page County 10
- Scott County 9
- Pottawattamie County 9
- Clinton County 9
- Woodbury County 8
- Winnebago County 8
- Warren County 7
- Dubuque County 7
- Butler County 7
- Des Moines County 7
- Henry County 6
- Floyd County 6
- Cass County 6
- Wright County 6
- Lee County 6
- Buena Vista County 6
- Cherokee County 6
- Sioux County 5
- Monroe County 5
- O'Brien County 5
- Benton County 5
- Grundy County 4
- Marshall County 4
- Dickinson County 4
- Fremont County 4
- Greene County 4
- Mahaska County 4
- Bremer County 4
- Buchanan County 4
- Adams County 3
- Emmet County 3
- Plymouth County 3
- Hancock County 3
- Hamilton County 3
- Crawford County 3
- Ida County 3
- Louisa County 3
- Mills County 3
Iowa, other years
Air-emissions stack tests recorded in Iowa, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-10-01 | OSAGE MUNICIPAL UTILITIES | OSAGE, Mitchell, IA | Pass | State |
| 2025-10-01 | OSAGE MUNICIPAL UTILITIES | OSAGE, Mitchell, IA | Pass | State |
| 2025-09-29 | BURKE CORP | NEVADA, Story, IA | Pass | State |
| 2025-09-29 | BURKE CORP | NEVADA, Story, IA | Pass | State |
| 2025-09-24 | INGREDION INCORPORATED | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-23 | RIVERSTONE GROUP INC. - STOCKTON | STOCKTON, Muscatine, IA | Pass | State |
| 2025-09-22 | GEORGIA-PACIFIC GYPSUM LLC | FORT DODGE, Webster, IA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | MOUNT PLEASANT MUNICIPAL UTILITIES | MOUNT PLEASANT, Henry, IA | Pass | State |
| 2025-09-18 | KENT NUTRITION GROUP - SHELDON | SHELDON, Sioux, IA | Pass | State |
| 2025-09-17 | PMX INDUSTRIES,INC. | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-12 | AMES MUNICIPAL UTILITIES & COMBUST TURB | AMES, Story, IA | Pass | State |
| 2025-09-10 | ILC RESOURCES/IOWA LIMESTONE CO-PLTS 1&3 | ALDEN, Hardin, IA | Pass | State |
| 2025-09-10 | CLOW VALVE COMPANY | OSKALOOSA, Mahaska, IA | Pass | State |
| 2025-09-10 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-10 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-10 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-10 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-10 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-09 | JOHN DEERE FOUNDRY WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-09-09 | ILC RESOURCES/IOWA LIMESTONE CO-PLTS 1&3 | ALDEN, Hardin, IA | Pass | State |
| 2025-09-09 | IOWA FERTILIZER CO — high-priority violation on file | WEVER, Lee, IA | Pass | State |
| 2025-09-09 | CLOW VALVE COMPANY | OSKALOOSA, Mahaska, IA | Pass | State |
| 2025-09-09 | ARCHER DANIELS MIDLAND DM SOYBEAN PLANT | DES MOINES, Polk, IA | Pass | Local |
| 2025-09-04 | MID AMERICAN ENERGY CO-COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2025-09-04 | BUNGE NORTH AMERICA INC-COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2025-09-04 | MIDAMERICAN ENERGY CO PLEASANT HILL GDMEC | PLEASANT HILL, Polk, IA | Pass | Local |
| 2025-09-03 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2025-09-03 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-09-03 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-09-03 | WEST BRANCH RNG — high-priority violation on file | MAURICE, Sioux, IA | Pass | State |
| 2025-09-03 | MIDAMERICAN ENERGY CO PLEASANT HILL GDMEC | PLEASANT HILL, Polk, IA | Pass | Local |
| 2025-08-27 | POET BIOREFINING CORNING — high-priority violation on file | CORNING, Adams, IA | Pass | State |
| 2025-08-27 | NATURAL GAS PIPELINE CO OF AMERICA-#107 | EMERSON, Mills, IA | Pass | State |
| 2025-08-27 | NATURAL GAS PIPELINE CO OF AMERICA-#107 | EMERSON, Mills, IA | Pass | State |
| 2025-08-26 | POET BIOREFINING CORNING — high-priority violation on file | CORNING, Adams, IA | Pass | State |
| 2025-08-26 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-08-26 | MCGREGOR MUNICIPAL UTILITIES | MCGREGOR, Clayton, IA | Pass | State |
| 2025-08-26 | LOUIS DREYFUS COMPANY GRAND JUNCTION, LLC | GRAND JUNCTION, Greene, IA | Pass | State |
| 2025-08-26 | LOUIS DREYFUS COMPANY GRAND JUNCTION, LLC | GRAND JUNCTION, Greene, IA | Pass | State |
| 2025-08-26 | NATURAL GAS PIPELINE CO OF AMERICA-#107 | EMERSON, Mills, IA | Pass | State |
| 2025-08-26 | NOVELIS ALR ALUMINUM, LLC (NOVELIS DAVENPORT CASTING) | DAVENPORT, Scott, IA | Pass | State |
| 2025-08-26 | NOVELIS ALR ALUMINUM, LLC (NOVELIS DAVENPORT CASTING) | DAVENPORT, Scott, IA | Pass | State |
| 2025-08-26 | NOVELIS ALR ALUMINUM, LLC (NOVELIS DAVENPORT CASTING) | DAVENPORT, Scott, IA | Pass | State |
| 2025-08-25 | NOVELIS ALR ALUMINUM, LLC (NOVELIS DAVENPORT CASTING) | DAVENPORT, Scott, IA | Pass | State |
| 2025-08-22 | CEDAR RAPIDS/LINN COUNTY SWA SITE 2 | MARION, Linn, IA | Pass | Local |
| 2025-08-20 | UNIVERSITY OF IOWA | IOWA CITY, Johnson, IA | Pass | State |
| 2025-08-20 | POET BIOREFINING - LIBERTY (EMMETSBURG) — high-priority violation on file | EMMETSBURG, Palo Alto, IA | Fail | State |
| 2025-08-20 | CF INDUSTRIES NITROGEN LLC - PORT NEAL NITROGEN COMPLEX — high-priority violation on file | SERGEANT BLUFF, Woodbury, IA | Fail | State |
| 2025-08-19 | LOPAREX INC | IOWA CITY, Johnson, IA | Pass | State |
| 2025-08-19 | RIVERSIDE CASINO & GOLF RESORT LLC | WASHINGTON, Washington, IA | Pass | State |
| 2025-08-19 | FOREST CITY MUNICIPAL LIGHT PLANT | FOREST CITY, Winnebago, IA | Pass | State |
| 2025-08-19 | FOREST CITY MUNICIPAL LIGHT PLANT | FOREST CITY, Winnebago, IA | Pass | State |
| 2025-08-19 | FOREST CITY MUNICIPAL LIGHT PLANT | FOREST CITY, Winnebago, IA | Pass | State |
| 2025-08-19 | ADM CORN PROCESSING | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-08-15 | ELITE OCTANE, LLC — high-priority violation on file | ATLANTIC, Cass, IA | Pass | State |
| 2025-08-14 | MURPHY-BROWN LLC | ALGONA, Kossuth, IA | Pass | State |
| 2025-08-14 | ELITE OCTANE, LLC — high-priority violation on file | ATLANTIC, Cass, IA | Pass | State |
| 2025-08-14 | ELITE OCTANE, LLC — high-priority violation on file | ATLANTIC, Cass, IA | Pass | State |
| 2025-08-14 | ELITE OCTANE, LLC — high-priority violation on file | ATLANTIC, Cass, IA | Pass | State |
| 2025-08-13 | ELITE OCTANE, LLC — high-priority violation on file | ATLANTIC, Cass, IA | Pass | State |
| 2025-08-13 | ELITE OCTANE, LLC — high-priority violation on file | ATLANTIC, Cass, IA | Pass | State |
| 2025-08-11 | MARTIN MARIETTA INC-AMES | AMES, Story, IA | Pass | State |
| 2025-08-08 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Pass | State |
| 2025-08-06 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2025-08-06 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2025-08-05 | IOWA RENEWABLE ENERGY LLC | WASHINGTON, Washington, IA | Pass | State |
| 2025-08-02 | CARGILL INC-EDDYVILLE | EDDYVILLE, Monroe, IA | Pass | State |
| 2025-07-31 | ESTHERVILLE MUNICIPAL UTILITIES-POWERPLT | ESTHERVILLE, Emmet, IA | Pass | State |
| 2025-07-31 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-07-31 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-07-31 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-07-31 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-07-31 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2025-07-31 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-07-31 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-07-31 | CALCIUM PRODUCTS INC-GILMORE CITY | GILMORE CITY, Pocahontas, IA | Pass | State |
| 2025-07-30 | ADM CLINTON BIOPROCESSING - CLINTON — high-priority violation on file | CLINTON, Clinton, IA | Fail | State |
| 2025-07-29 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2025-07-29 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2025-07-29 | CALCIUM PRODUCTS INC-GILMORE CITY | GILMORE CITY, Pocahontas, IA | Pass | State |
| 2025-07-29 | MID AMERICAN ENERGY CO-SERGEANT BLUFF | SERGEANT BLUFF, Woodbury, IA | Pass | State |
| 2025-07-29 | MID AMERICAN ENERGY CO-SERGEANT BLUFF | SERGEANT BLUFF, Woodbury, IA | Pass | State |
| 2025-07-24 | AFINITAS — high-priority violation on file | MEDIAPOLIS (HISTORICAL), Des Moines, IA | Fail | State |
| 2025-07-23 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-07-23 | NOVELIS ALR ALUMINUM, LLC (NOVELIS DAVENPORT CASTING) | DAVENPORT, Scott, IA | Pass | State |
| 2025-07-23 | SIOUXLAND ENERGY COOPERATIVE | SIOUX CENTER, Sioux, IA | Pass | State |
| 2025-07-23 | SIOUXLAND ENERGY COOPERATIVE | SIOUX CENTER, Sioux, IA | Pass | State |
| 2025-07-23 | PLATINUM CRUSH | ALTA, Buena Vista, IA | Pass | State |
| 2025-07-23 | MIDAMERICAN ENERGY COMPANY | FORT DODGE, Webster, IA | Pass | State |
| 2025-07-22 | PLATINUM CRUSH | ALTA, Buena Vista, IA | Pass | State |
| 2025-07-22 | BRIDGESTONE AMERICAS TIRE OPERATIONS | DES MOINES, Polk, IA | Pass | Local |
| 2025-07-21 | ARCHER DANIELS MIDLAND DM SOYBEAN PLANT | DES MOINES, Polk, IA | Pass | Local |
| 2025-07-18 | GREEN PLAINS SHENANDOAH LLC (GP SHENANDOAH) | SHENANDOAH, Fremont, IA | Pass | State |
| 2025-07-17 | ADM CLINTON BIOPROCESSING - CLINTON — high-priority violation on file | CLINTON, Clinton, IA | Pass | State |
| 2025-07-17 | IOWA FERTILIZER CO — high-priority violation on file | WEVER, Lee, IA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.