EPA Air · stack tests by state and year
Air-emissions stack tests in Iowa, 2026
- 167Stack 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 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Iowa, 2026
- Hardin County 15
- Muscatine County 14
- Polk County 14
- Cerro Gordo County 10
- Guthrie County 9
- Jackson County 8
- Johnson County 7
- Cherokee County 7
- Crawford County 6
- Chickasaw County 6
- Woodbury County 5
- Linn County 5
- Story County 5
- Clinton County 3
- Dallas County 3
- Ida County 3
- Hancock County 3
- Pottawattamie County 3
- Louisa County 3
- Mitchell County 3
Iowa, other years
Air-emissions stack tests recorded in Iowa, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-03-26 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2026-03-26 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2026-03-26 | PRESTAGE FOODS OF IOWA, LLC | EAGLE GROVE, Wright, IA | Pass | State |
| 2026-03-25 | SUMNER MUNICIPAL LIGHT PLANT | SUMNER (HISTORICAL), Bremer, IA | Pass | State |
| 2026-03-25 | SUMNER MUNICIPAL LIGHT PLANT | SUMNER (HISTORICAL), Bremer, IA | Pass | State |
| 2026-03-25 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2026-03-25 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2026-03-19 | AMSTED RAIL COMPANY, INC | KEOKUK, Lee, IA | Pass | State |
| 2026-03-18 | INTEGRATED DNA TECHNOLOGIES | CORALVILLE, Johnson, IA | Pass | State |
| 2026-03-18 | VALERO RENEWABLE FUELS CO LLC-FT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2026-03-11 | IOWA FERTILIZER CO — high-priority violation on file | WEVER, Lee, IA | Pass | State |
| 2026-03-11 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-03-10 | NORTHERN NATURAL GAS CO-OGDEN | OGDEN, Boone, IA | Pass | State |
| 2026-03-10 | NORTHERN NATURAL GAS CO-OGDEN | OGDEN, Boone, IA | Pass | State |
| 2026-03-10 | LOUIS DREYFUS COMPANY GRAND JUNCTION, LLC | GRAND JUNCTION, Greene, IA | Pass | State |
| 2026-03-10 | CLOW VALVE COMPANY | OSKALOOSA, Mahaska, IA | Pass | State |
| 2026-03-10 | CLOW VALVE COMPANY | OSKALOOSA, Mahaska, IA | Pass | State |
| 2026-03-10 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-03-10 | SEABOARD TRIUMPH FOODS, LLC — high-priority violation on file | CITY OF SIOUX CITY, Woodbury, IA | Fail | State |
| 2026-03-06 | CARGILL INC-CEDAR RAPIDS_SW_SOYBEAN | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2026-03-06 | CARGILL INC-CEDAR RAPIDS_SW_SOYBEAN | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2026-03-06 | CARGILL INC-CEDAR RAPIDS_SW_SOYBEAN | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2026-03-03 | CF INDUSTRIES NITROGEN LLC - PORT NEAL NITROGEN COMPLEX — high-priority violation on file | SERGEANT BLUFF, Woodbury, IA | Pass | State |
| 2026-03-03 | MERRILL IRON AND STEEL | CAMANCHE, Clinton, IA | Pass | State |
| 2026-03-03 | ADM CORN PROCESSING | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2026-02-26 | UNIVERSITY OF IOWA | IOWA CITY, Johnson, IA | Pass | State |
| 2026-02-24 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-02-24 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2026-02-24 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-02-18 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Fail | State |
| 2026-02-18 | ELITE OCTANE, LLC — high-priority violation on file | ATLANTIC, Cass, IA | Pass | State |
| 2026-02-18 | ELITE OCTANE, LLC — high-priority violation on file | ATLANTIC, Cass, IA | Pass | State |
| 2026-02-17 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Fail | State |
| 2026-02-12 | PELLA CORP-CARROLL DIV | CARROLL, Carroll, IA | Pass | State |
| 2026-02-12 | NATURAL GAS PIPELINE CO OF AMERICA-#204 | COLUMBUS JUNCTION, Louisa, IA | Pass | State |
| 2026-02-11 | IPL-LIME CREEK COMBUSTION TURBINES | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2026-02-11 | LOPAREX INC | IOWA CITY, Johnson, IA | Pass | State |
| 2026-02-11 | NATURAL GAS PIPELINE CO OF AMERICA-#204 | COLUMBUS JUNCTION, Louisa, IA | Pass | State |
| 2026-02-11 | NATURAL GAS PIPELINE CO OF AMERICA-#204 | COLUMBUS JUNCTION, Louisa, IA | Pass | State |
| 2026-02-10 | LOPAREX INC | IOWA CITY, Johnson, IA | Pass | State |
| 2026-02-10 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2026-02-10 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2026-02-10 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2026-02-10 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2026-02-10 | IPL/ALLIANT ENERGY-OTTUMWA GEN STATION | OTTUMWA, Wapello, IA | Pass | State |
| 2026-02-10 | NATURAL GAS PIPELINE CO OF AMERICA-#205 | KEOTA, Washington, IA | Pass | State |
| 2026-02-05 | GINGER WEST DATA CENTER | CITY OF WEST DES MOINES, Dallas, IA | Pass | State |
| 2026-02-05 | GINGER WEST DATA CENTER | CITY OF WEST DES MOINES, Dallas, IA | Pass | State |
| 2026-02-03 | VAN DIEST SUPPLY CO | WEBSTER CITY, Hamilton, IA | Pass | State |
| 2026-01-22 | MURPHY-BROWN LLC | ALGONA, Kossuth, IA | Pass | State |
| 2026-01-22 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Pass | Local |
| 2026-01-22 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Pass | Local |
| 2026-01-20 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-01-20 | MTBT - MARSHALLTOWN | MARSHALLTOWN, Marshall, IA | Pass | State |
| 2026-01-14 | VERBIO — high-priority violation on file | NEVADA, Story, IA | Pass | State |
| 2026-01-13 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Fail | State |
| 2026-01-13 | POET BIOREFINING - MENLO, LLC | MENLO, Guthrie, IA | Pass | State |
| 2026-01-08 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2026-01-08 | ADM CLINTON BIOPROCESSING - CLINTON — high-priority violation on file | CLINTON, Clinton, IA | Pass | State |
| 2026-01-07 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Fail | State |
| 2026-01-07 | PLYMOUTH ENERGY LLC | MERRILL, Plymouth, IA | Pass | State |
| 2026-01-07 | PLYMOUTH ENERGY LLC | MERRILL, Plymouth, IA | Pass | State |
| 2026-01-06 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2026-01-06 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2026-01-06 | CARGILL INC-IOWA FALLS | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-01-06 | STINE ATP — high-priority violation on file | REDFIELD, Dallas, IA | Fail | State |
| 2026-01-05 | CARGILL INC-IOWA FALLS | IOWA FALLS, Hardin, IA | Pass | State |
PreviousPage 1Page 2 of 2
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.