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 |
|---|---|---|---|---|
| 2025-03-25 | JOHN DEERE PRODUCT ENGINEERING CENTER | CEDAR FALLS, Black Hawk, IA | Pass | State |
| 2025-03-25 | JOHN DEERE PRODUCT ENGINEERING CENTER | CEDAR FALLS, Black Hawk, IA | Pass | State |
| 2025-03-25 | JOHN DEERE PRODUCT ENGINEERING CENTER | CEDAR FALLS, Black Hawk, IA | Pass | State |
| 2025-03-25 | MID AMERICAN ENERGY CO-KNOXVILLE | KNOXVILLE, Marion, IA | Pass | State |
| 2025-03-25 | MID AMERICAN ENERGY CO-KNOXVILLE | KNOXVILLE, Marion, IA | Pass | State |
| 2025-03-25 | MID AMERICAN ENERGY CO-KNOXVILLE | KNOXVILLE, Marion, IA | Pass | State |
| 2025-03-25 | MID AMERICAN ENERGY CO-KNOXVILLE | KNOXVILLE, Marion, IA | Pass | State |
| 2025-03-25 | VALERO RENEWABLE FUELS CO LLC-FT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2025-03-25 | CF INDUSTRIES NITROGEN LLC - PORT NEAL NITROGEN COMPLEX — high-priority violation on file | SERGEANT BLUFF, Woodbury, IA | Pass | State |
| 2025-03-25 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Fail | Local |
| 2025-03-20 | AMSTED RAIL COMPANY, INC | KEOKUK, Lee, IA | Pass | State |
| 2025-03-20 | MID AMERICAN ENERGY CO-SHENANDOAH | SHENANDOAH, Page, IA | Pass | State |
| 2025-03-20 | MID AMERICAN ENERGY CO-SHENANDOAH | SHENANDOAH, Page, IA | Pass | State |
| 2025-03-20 | MID AMERICAN ENERGY CO-SHENANDOAH | SHENANDOAH, Page, IA | Pass | State |
| 2025-03-20 | CEDAR RAPIDS WATER DEPARTMENT-NORTHWEST TREATMENT PLANT | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-03-19 | LOUIS DREYFUS COMPANY GRAND JUNCTION, LLC | GRAND JUNCTION, Greene, IA | Pass | State |
| 2025-03-19 | MID AMERICAN ENERGY CO-SHENANDOAH | SHENANDOAH, Page, IA | Pass | State |
| 2025-03-19 | MID AMERICAN ENERGY CO-SHENANDOAH | SHENANDOAH, Page, IA | Pass | State |
| 2025-03-19 | MID AMERICAN ENERGY CO-SHENANDOAH | SHENANDOAH, Page, IA | Pass | State |
| 2025-03-19 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-03-19 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-03-18 | GREEN PLAINS ETHANOL STORAGE, LLC (GP SUPERIOR) | SUPERIOR, Dickinson, IA | Pass | State |
| 2025-03-18 | MID AMERICAN ENERGY CO-SHENANDOAH | SHENANDOAH, Page, IA | Pass | State |
| 2025-03-18 | MID AMERICAN ENERGY CO-SHENANDOAH | SHENANDOAH, Page, IA | Pass | State |
| 2025-03-18 | MID AMERICAN ENERGY CO-SHENANDOAH | SHENANDOAH, Page, IA | Pass | State |
| 2025-03-18 | MID AMERICAN ENERGY CO-SHENANDOAH | SHENANDOAH, Page, IA | Pass | State |
| 2025-03-18 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-03-18 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-03-18 | ADM CORN PROCESSING | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-03-13 | MID AMERICAN ENERGY CO-WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-03-12 | MID AMERICAN ENERGY CO-WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-03-12 | MID AMERICAN ENERGY CO-WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-03-12 | MID AMERICAN ENERGY CO-WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-03-12 | MID AMERICAN ENERGY CO-WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-03-12 | VERBIO — high-priority violation on file | NEVADA, Story, IA | Pass | State |
| 2025-03-11 | MID AMERICAN ENERGY CO-WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-03-11 | MID AMERICAN ENERGY CO-WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-03-11 | MID AMERICAN ENERGY CO-WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-03-11 | MID AMERICAN ENERGY CO-WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-03-11 | CLOW VALVE COMPANY | OSKALOOSA, Mahaska, IA | Pass | State |
| 2025-03-11 | CLOW VALVE COMPANY | OSKALOOSA, Mahaska, IA | Pass | State |
| 2025-03-06 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-03-06 | MID AMERICAN ENERGY CO-COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2025-03-06 | POET BIOREFINING - GOWRIE, LLC — high-priority violation on file | GOWRIE, Webster, IA | Pass | State |
| 2025-03-04 | INGREDION INCORPORATED | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-03-04 | INGREDION INCORPORATED | CEDAR RAPIDS, Linn, IA | Fail | Local |
| 2025-03-04 | MERCY MEDICAL CENTER | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-02-27 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-02-25 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-02-25 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2025-02-25 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-02-25 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-02-25 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2025-02-25 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2025-02-25 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-02-20 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-02-20 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2025-02-20 | POET BIOREFINING - GOWRIE, LLC — high-priority violation on file | GOWRIE, Webster, IA | Fail | State |
| 2025-02-19 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2025-02-19 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2025-02-19 | PLYMOUTH ENERGY LLC | MERRILL, Plymouth, IA | Pass | State |
| 2025-02-18 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2025-02-18 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2025-02-18 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2025-02-18 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2025-02-13 | CRYOTECH DEICING TECHNOLOGY | FORT MADISON, Lee, IA | Pass | State |
| 2025-02-11 | NATURAL GAS PIPELINE CO OF AMERICA-#204 | COLUMBUS JUNCTION, Louisa, IA | Pass | State |
| 2025-02-11 | NATURAL GAS PIPELINE CO OF AMERICA-#204 | COLUMBUS JUNCTION, Louisa, IA | Pass | State |
| 2025-02-11 | NATURAL GAS PIPELINE CO OF AMERICA-#204 | COLUMBUS JUNCTION, Louisa, IA | Pass | State |
| 2025-02-07 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-02-05 | ZINPRO CORP - GARNER — high-priority violation on file | GARNER, Hancock, IA | Fail | State |
| 2025-02-05 | CENTRAL IOWA RENEWABLE ENERGY (CORN) LP | GOLDFIELD, Wright, IA | Pass | State |
| 2025-02-04 | BAYER CROPSCIENCE LP 3670/6908/6909 | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-01-31 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-01-31 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Fail | Local |
| 2025-01-30 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-01-30 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-01-29 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Fail | State |
| 2025-01-29 | IOWA STATE UNIVERSITY | AMES, Story, IA | Pass | State |
| 2025-01-28 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-01-28 | IOWA STATE UNIVERSITY | AMES, Story, IA | Pass | State |
| 2025-01-28 | NORTHERN NATURAL GAS CO-GARNER LNG FACILITY | GARNER, Hancock, IA | Pass | State |
| 2025-01-25 | UNIVERSITY OF NORTHERN IOWA | CEDAR FALLS, Black Hawk, IA | Pass | State |
| 2025-01-22 | NOVELIS ALR ALUMINUM, LLC (NOVELIS DAVENPORT CASTING) | DAVENPORT, Scott, IA | Fail | State |
| 2025-01-22 | NOVELIS ALR ALUMINUM, LLC (NOVELIS DAVENPORT CASTING) | DAVENPORT, Scott, IA | Fail | State |
| 2025-01-22 | NOVELIS ALR ALUMINUM, LLC (NOVELIS DAVENPORT CASTING) | DAVENPORT, Scott, IA | Fail | State |
| 2025-01-22 | NOVELIS ALR ALUMINUM, LLC (NOVELIS DAVENPORT CASTING) | DAVENPORT, Scott, IA | Pass | State |
| 2025-01-17 | OSMIUM DATA CENTER — high-priority violation on file | WEST DES MOINES, Warren, IA | Pass | State |
| 2025-01-16 | OSMIUM DATA CENTER — high-priority violation on file | WEST DES MOINES, Warren, IA | Fail | State |
| 2025-01-16 | IPL-PRAIRIE CREEK STATION | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-01-15 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2025-01-15 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2025-01-15 | JBS USA PORK | OTTUMWA, Wapello, IA | Pass | State |
| 2025-01-15 | IPL-PRAIRIE CREEK STATION | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-01-14 | OSMIUM DATA CENTER — high-priority violation on file | WEST DES MOINES, Warren, IA | Pass | State |
| 2025-01-08 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Fail | Local |
| 2025-01-07 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2025-01-07 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2025-01-07 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2025-01-06 | U S GYPSUM CO-FORT DODGE | FORT DODGE, Webster, IA | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.