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 |
|---|---|---|---|---|
| 2025-06-05 | PELLA WEST SUBSTATION — high-priority violation on file | PELLA, Marion, IA | Pass | State |
| 2025-06-05 | PELLA WEST SUBSTATION — high-priority violation on file | PELLA, Marion, IA | Pass | State |
| 2025-06-05 | VALERO RENEWABLE FUELS CO LLC-HARTLEY — high-priority violation on file | HARTLEY, O'Brien, IA | Pass | State |
| 2025-06-05 | SOUTHWEST IOWA RENEWABLE ENERGY — high-priority violation on file | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2025-06-04 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | SHELL ROCK, Butler, IA | Pass | State |
| 2025-06-04 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | SHELL ROCK, Butler, IA | Fail | State |
| 2025-06-04 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | SHELL ROCK, Butler, IA | Pass | State |
| 2025-06-04 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-06-04 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2025-06-04 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2025-06-04 | BIG RIVER UNITED ENERGY LLC-W BURLINGTON | WEST BURLINGTON, Des Moines, IA | Pass | State |
| 2025-06-04 | BIG RIVER UNITED ENERGY LLC-W BURLINGTON | WEST BURLINGTON, Des Moines, IA | Pass | State |
| 2025-06-04 | BIG RIVER UNITED ENERGY LLC-W BURLINGTON | WEST BURLINGTON, Des Moines, IA | Pass | State |
| 2025-06-04 | GREEN PLAINS ETHANOL STORAGE, LLC (GP SUPERIOR) | SUPERIOR, Dickinson, IA | Pass | State |
| 2025-06-04 | GREEN PLAINS ETHANOL STORAGE, LLC (GP SUPERIOR) | SUPERIOR, Dickinson, IA | Pass | State |
| 2025-06-04 | POET BIOREFINING - MENLO, LLC | MENLO, Guthrie, IA | Pass | State |
| 2025-06-04 | POET BIOREFINING - ARTHUR, LLC — high-priority violation on file | ARTHUR, Ida, IA | Pass | State |
| 2025-06-04 | PELLA WEST SUBSTATION — high-priority violation on file | PELLA, Marion, IA | Pass | State |
| 2025-06-04 | PELLA WEST SUBSTATION — high-priority violation on file | PELLA, Marion, IA | Pass | State |
| 2025-06-04 | PELLA WEST SUBSTATION — high-priority violation on file | PELLA, Marion, IA | Pass | State |
| 2025-06-04 | VALERO RENEWABLE FUELS CO LLC-HARTLEY — high-priority violation on file | HARTLEY, O'Brien, IA | Pass | State |
| 2025-06-04 | SOUTHWEST IOWA RENEWABLE ENERGY — high-priority violation on file | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2025-06-03 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-06-03 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-06-03 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2025-06-03 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2025-06-03 | BIG RIVER UNITED ENERGY LLC-W BURLINGTON | WEST BURLINGTON, Des Moines, IA | Pass | State |
| 2025-06-03 | BIG RIVER UNITED ENERGY LLC-W BURLINGTON | WEST BURLINGTON, Des Moines, IA | Pass | State |
| 2025-06-03 | BIG RIVER UNITED ENERGY LLC-W BURLINGTON | WEST BURLINGTON, Des Moines, IA | Pass | State |
| 2025-06-03 | PELLA WEST SUBSTATION — high-priority violation on file | PELLA, Marion, IA | Pass | State |
| 2025-06-03 | PELLA WEST SUBSTATION — high-priority violation on file | PELLA, Marion, IA | Pass | State |
| 2025-06-03 | PELLA WEST SUBSTATION — high-priority violation on file | PELLA, Marion, IA | Pass | State |
| 2025-06-03 | PELLA WEST SUBSTATION — high-priority violation on file | PELLA, Marion, IA | Pass | State |
| 2025-06-03 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-06-03 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-06-03 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-06-03 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-05-20 | ADM CLINTON BIOPROCESSING - CLINTON — high-priority violation on file | CLINTON, Clinton, IA | Fail | State |
| 2025-05-16 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Pass | State |
| 2025-05-16 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Pass | State |
| 2025-05-15 | UNIVERSITY OF IOWA | IOWA CITY, Johnson, IA | Pass | State |
| 2025-05-15 | UNIVERSITY OF IOWA | IOWA CITY, Johnson, IA | Pass | State |
| 2025-05-15 | BARKLEY ASPHALT INC | SIOUX CITY, Woodbury, IA | Fail | State |
| 2025-05-14 | UNIVERSITY OF IOWA | IOWA CITY, Johnson, IA | Pass | State |
| 2025-05-14 | UNIVERSITY OF IOWA | IOWA CITY, Johnson, IA | Pass | State |
| 2025-05-13 | LOUIS DREYFUS COMPANY GRAND JUNCTION, LLC | GRAND JUNCTION, Greene, IA | Pass | State |
| 2025-05-13 | ZINPRO CORP - GARNER — high-priority violation on file | GARNER, Hancock, IA | Pass | State |
| 2025-05-13 | UNIVERSITY OF IOWA | IOWA CITY, Johnson, IA | Pass | State |
| 2025-05-13 | UNIVERSITY OF IOWA | IOWA CITY, Johnson, IA | Pass | State |
| 2025-05-12 | PETERSON CONTRACTORS INC | REINBECK, Grundy, IA | Pass | State |
| 2025-05-12 | PMX INDUSTRIES,INC. | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-05-08 | POET BIOREFINING - FAIRBANK, LLC | FAIRBANK, Buchanan, IA | Pass | State |
| 2025-05-07 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-05-07 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2025-05-06 | GUARDIAN INDUSTRIES CORP | DE WITT, Clinton, IA | Pass | State |
| 2025-05-01 | POET BIOREFINING - MENLO, LLC | MENLO, Guthrie, IA | Pass | State |
| 2025-05-01 | POET BIOREFINING - MENLO, LLC | MENLO, Guthrie, IA | Pass | State |
| 2025-05-01 | ARCHER DANIELS MIDLAND DM SOYBEAN PLANT | DES MOINES, Polk, IA | Fail | Local |
| 2025-05-01 | ARCHER DANIELS MIDLAND DM SOYBEAN PLANT | DES MOINES, Polk, IA | Pass | Local |
| 2025-04-29 | DIAMOND V MILLS, INC. SOUTH PLANT | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-04-29 | DIAMOND V MILLS, INC. SOUTH PLANT | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-04-29 | DIAMOND V MILLS, INC. SOUTH PLANT | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-04-29 | DIAMOND V MILLS, INC. SOUTH PLANT | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-04-29 | DIAMOND V MILLS, INC. SOUTH PLANT | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-04-28 | JOHN DEERE FOUNDRY WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-04-25 | LANDFILL OF NORTH IOWA | CLEAR LAKE, Cerro Gordo, IA | Pass | State |
| 2025-04-24 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Pass | State |
| 2025-04-24 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Pass | State |
| 2025-04-24 | INGREDION INCORPORATED | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-04-24 | INGREDION INCORPORATED | CEDAR RAPIDS, Linn, IA | Fail | Local |
| 2025-04-23 | INGREDION INCORPORATED | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-04-23 | DIAMOND V MILLS, INC. SOUTH PLANT | CEDAR RAPIDS, Linn, IA | Fail | Local |
| 2025-04-22 | CASCADE MUNICIPAL UTILITIES | CASCADE, Dubuque, IA | Pass | State |
| 2025-04-22 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Fail | State |
| 2025-04-22 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Fail | State |
| 2025-04-22 | INGREDION INCORPORATED | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-04-17 | WAVERLY LIGHT & POWER-NORTH & SOUTH PLTS | WAVERLY, Bremer, IA | Pass | State |
| 2025-04-17 | TRINITYRAIL MAINTENANCE SERVICES | SHELL ROCK, Butler, IA | Pass | State |
| 2025-04-16 | WAVERLY LIGHT & POWER-NORTH & SOUTH PLTS | WAVERLY, Bremer, IA | Pass | State |
| 2025-04-16 | WAVERLY LIGHT & POWER-NORTH & SOUTH PLTS | WAVERLY, Bremer, IA | Pass | State |
| 2025-04-16 | PLATINUM CRUSH | ALTA, Buena Vista, IA | Fail | State |
| 2025-04-15 | WAVERLY LIGHT & POWER-NORTH & SOUTH PLTS | WAVERLY, Bremer, IA | Pass | State |
| 2025-04-15 | CARGILL INC-EDDYVILLE | EDDYVILLE, Monroe, IA | Pass | State |
| 2025-04-14 | EQUISTAR CHEMICALS LP | CLINTON, Clinton, IA | Pass | State |
| 2025-04-10 | VINTON MUNICIPAL ELECTRIC UTILITIES | VINTON, Benton, IA | Pass | State |
| 2025-04-10 | VINTON MUNICIPAL ELECTRIC UTILITIES | VINTON, Benton, IA | Pass | State |
| 2025-04-10 | VINTON MUNICIPAL ELECTRIC UTILITIES | VINTON, Benton, IA | Pass | State |
| 2025-04-09 | VINTON MUNICIPAL ELECTRIC UTILITIES | VINTON, Benton, IA | Pass | State |
| 2025-04-09 | VINTON MUNICIPAL ELECTRIC UTILITIES | VINTON, Benton, IA | Pass | State |
| 2025-04-09 | HENNIGES AUTOMOTIVE IOWA INC | KEOKUK, Lee, IA | Pass | State |
| 2025-04-08 | NEW HAMPTON MUNICIPAL LIGHT & POWER | NEW HAMPTON, Chickasaw, IA | Pass | State |
| 2025-04-03 | MTBT - MARSHALLTOWN | MARSHALLTOWN, Marshall, IA | Pass | State |
| 2025-04-02 | MTBT - OTTUMWA | OTTUMWA, Wapello, IA | Pass | State |
| 2025-03-27 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | SHELL ROCK, Butler, IA | Pass | State |
| 2025-03-26 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | SHELL ROCK, Butler, IA | Pass | State |
| 2025-03-26 | MID AMERICAN ENERGY CO-KNOXVILLE | KNOXVILLE, Marion, IA | Pass | State |
| 2025-03-26 | MID AMERICAN ENERGY CO-KNOXVILLE | KNOXVILLE, Marion, IA | Pass | State |
| 2025-03-26 | MID AMERICAN ENERGY CO-KNOXVILLE | KNOXVILLE, Marion, IA | Pass | State |
| 2025-03-26 | MID AMERICAN ENERGY CO-KNOXVILLE | KNOXVILLE, Marion, IA | Pass | State |
| 2025-03-26 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Fail | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.