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 |
|---|---|---|---|---|
| 2025-07-16 | AG PROCESSING INC-MANNING | MANNING, Carroll, IA | Pass | State |
| 2025-07-15 | ADM CLINTON BIOPROCESSING - CLINTON — high-priority violation on file | CLINTON, Clinton, IA | Pass | State |
| 2025-07-15 | GREEN PLAINS SHENANDOAH LLC (GP SHENANDOAH) | SHENANDOAH, Fremont, IA | Pass | State |
| 2025-07-14 | ADM TERMINAL SERVICES - CAMANCHE | CAMANCHE, Clinton, IA | Pass | State |
| 2025-07-10 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Pass | State |
| 2025-07-10 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Pass | State |
| 2025-07-09 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Pass | State |
| 2025-07-09 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Pass | State |
| 2025-07-09 | KNIFE RIVER MIDWEST LLC-SIOUX CITY-PLT#4 — high-priority violation on file | SIOUX CITY, Woodbury, IA | Pass | State |
| 2025-07-08 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Fail | State |
| 2025-07-02 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pending | State |
| 2025-07-02 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2025-07-02 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2025-07-02 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2025-07-02 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2025-07-02 | KENT NUTRITION GROUP - SHELDON | SHELDON, Sioux, IA | Fail | State |
| 2025-06-30 | VANTAGE CORN PROCESSORS, LLC | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-06-30 | VANTAGE CORN PROCESSORS, LLC | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-06-27 | VANTAGE CORN PROCESSORS, LLC | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-06-27 | VANTAGE CORN PROCESSORS, LLC | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-06-26 | VALERO RENEWABLE FUELS CO LLC-ALBERTCITY | ALBERT CITY, Buena Vista, IA | Pass | State |
| 2025-06-26 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Pass | State |
| 2025-06-26 | GRUNDY CENTER MUNICIPAL LIGHT & POWER | GRUNDY CENTER (HISTORICAL), Grundy, IA | Pass | State |
| 2025-06-26 | GRUNDY CENTER MUNICIPAL LIGHT & POWER | GRUNDY CENTER (HISTORICAL), Grundy, IA | Pass | State |
| 2025-06-26 | GRUNDY CENTER MUNICIPAL LIGHT & POWER | GRUNDY CENTER (HISTORICAL), Grundy, IA | Pass | State |
| 2025-06-26 | KOCH FERTILIZER FT. DODGE, LLC | FORT DODGE, Webster, IA | Pass | State |
| 2025-06-26 | VANTAGE CORN PROCESSORS, LLC | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-06-26 | VANTAGE CORN PROCESSORS, LLC | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-06-25 | CONAGRA GROCERY PRODUCTS INC | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-06-25 | VALERO RENEWABLE FUELS CO LLC-ALBERTCITY | ALBERT CITY, Buena Vista, IA | Pass | State |
| 2025-06-25 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Pass | State |
| 2025-06-25 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Pass | State |
| 2025-06-25 | PLYMOUTH ENERGY LLC | MERRILL, Plymouth, IA | Pass | State |
| 2025-06-25 | PLYMOUTH ENERGY LLC | MERRILL, Plymouth, IA | Pass | State |
| 2025-06-25 | VANTAGE CORN PROCESSORS, LLC | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-06-24 | CONAGRA GROCERY PRODUCTS INC | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-06-24 | ESTHERVILLE MUNICIPAL UTILITIES-POWERPLT | ESTHERVILLE, Emmet, IA | Pass | State |
| 2025-06-24 | ESTHERVILLE MUNICIPAL UTILITIES-POWERPLT | ESTHERVILLE, Emmet, IA | Pass | State |
| 2025-06-24 | LENOX MUNICIPAL LIGHT & POWER | LENOX (HISTORICAL), Taylor, IA | Pass | State |
| 2025-06-24 | VANTAGE CORN PROCESSORS, LLC | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-06-24 | VANTAGE CORN PROCESSORS, LLC | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-06-24 | VANTAGE CORN PROCESSORS, LLC | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-06-19 | ALGONA MUNICIPAL UTILITIES | ALGONA, Kossuth, IA | Pass | State |
| 2025-06-19 | ALGONA MUNICIPAL UTILITIES | ALGONA, Kossuth, IA | Pass | State |
| 2025-06-19 | FORT DODGE CORRECTIONAL FACILITY | FORT DODGE, Webster, IA | Pass | State |
| 2025-06-19 | FORT DODGE CORRECTIONAL FACILITY | FORT DODGE, Webster, IA | Pass | State |
| 2025-06-19 | CENTRAL IOWA RENEWABLE ENERGY (CORN) LP | GOLDFIELD, Wright, IA | Pass | State |
| 2025-06-19 | CENTRAL IOWA RENEWABLE ENERGY (CORN) LP | GOLDFIELD, Wright, IA | Pass | State |
| 2025-06-18 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2025-06-18 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2025-06-18 | ALGONA MUNICIPAL UTILITIES | ALGONA, Kossuth, IA | Pass | State |
| 2025-06-18 | ALGONA MUNICIPAL UTILITIES | ALGONA, Kossuth, IA | Pass | State |
| 2025-06-18 | FORT DODGE CORRECTIONAL FACILITY | FORT DODGE, Webster, IA | Pass | State |
| 2025-06-18 | VALERO RENEWABLE FUELS CO LLC-FT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2025-06-18 | VALERO RENEWABLE FUELS CO LLC-FT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2025-06-18 | CENTRAL IOWA RENEWABLE ENERGY (CORN) LP | GOLDFIELD, Wright, IA | Pass | State |
| 2025-06-18 | BLACKTOP SERVICE CO. - MT ETNA | CORNING, Adams, IA | Pass | State |
| 2025-06-17 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2025-06-17 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2025-06-17 | POET BIOREFINING - JEWELL | JEWELL, Hamilton, IA | Pass | State |
| 2025-06-17 | ABSOLUTE ENERGY LLC-SAINT ANSGAR (MONA) | SAINT ANSGAR, Mitchell, IA | Pass | State |
| 2025-06-17 | CENTRAL IOWA RENEWABLE ENERGY (CORN) LP | GOLDFIELD, Wright, IA | Fail | State |
| 2025-06-13 | POET BIOREFINING - FAIRBANK, LLC | FAIRBANK, Buchanan, IA | Pass | State |
| 2025-06-13 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-06-13 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-06-13 | DANISCO US, INC. — high-priority violation on file | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-06-12 | POET BIOREFINING - FAIRBANK, LLC | FAIRBANK, Buchanan, IA | Pass | State |
| 2025-06-12 | BIG RIVER UNITED ENERGY LLC-DYERSVILLE | DYERSVILLE, Dubuque, IA | Pass | State |
| 2025-06-12 | VALERO RENEWABLE FUELS LLC-CHARLES CITY | CHARLES CITY, Floyd, IA | Pass | State |
| 2025-06-12 | VALERO RENEWABLE FUELS LLC-CHARLES CITY | CHARLES CITY, Floyd, IA | Pass | State |
| 2025-06-12 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-06-12 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-06-12 | ABSOLUTE ENERGY LLC-SAINT ANSGAR (MONA) | SAINT ANSGAR, Mitchell, IA | Pass | State |
| 2025-06-11 | POET BIOREFINING - FAIRBANK, LLC | FAIRBANK, Buchanan, IA | Pass | State |
| 2025-06-11 | BIG RIVER UNITED ENERGY LLC-DYERSVILLE | DYERSVILLE, Dubuque, IA | Pass | State |
| 2025-06-11 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-06-11 | ABSOLUTE ENERGY LLC-SAINT ANSGAR (MONA) | SAINT ANSGAR, Mitchell, IA | Fail | State |
| 2025-06-11 | GEORGIA-PACIFIC GYPSUM LLC | FORT DODGE, Webster, IA | Pass | State |
| 2025-06-11 | AG PROCESSING INC-EAGLE GROVE | EAGLE GROVE, Wright, IA | Fail | State |
| 2025-06-10 | BIG RIVER UNITED ENERGY LLC-DYERSVILLE | DYERSVILLE, Dubuque, IA | Pass | State |
| 2025-06-10 | VALERO RENEWABLE FUELS LLC-CHARLES CITY | CHARLES CITY, Floyd, IA | Pass | State |
| 2025-06-10 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-06-10 | ABSOLUTE ENERGY LLC-SAINT ANSGAR (MONA) | SAINT ANSGAR, Mitchell, IA | Pass | State |
| 2025-06-10 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-06-10 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-06-10 | MUSCATINE POWER & WATER | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-06-10 | GEORGIA-PACIFIC GYPSUM LLC | FORT DODGE, Webster, IA | Pass | State |
| 2025-06-10 | GEORGIA-PACIFIC GYPSUM LLC | FORT DODGE, Webster, IA | Pass | State |
| 2025-06-09 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-06-08 | GREEN PLAINS ETHANOL STORAGE, LLC (GP SUPERIOR) | SUPERIOR, Dickinson, IA | Pass | State |
| 2025-06-06 | GEORGIA-PACIFIC GYPSUM LLC | FORT DODGE, Webster, IA | Pass | State |
| 2025-06-05 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | SHELL ROCK, Butler, IA | Pass | State |
| 2025-06-05 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2025-06-05 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2025-06-05 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2025-06-05 | POET BIOREFINING - ARTHUR, LLC — high-priority violation on file | ARTHUR, Ida, IA | Pass | State |
| 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 | 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 |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.