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 |
|---|---|---|---|---|
| 2026-06-18 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Pass | State |
| 2026-06-18 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Pass | State |
| 2026-06-18 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Pass | Local |
| 2026-06-17 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Pass | State |
| 2026-06-17 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Fail | State |
| 2026-06-17 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Pass | State |
| 2026-06-16 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Pass | State |
| 2026-06-16 | MARTIN MARIETTA INC-ALDEN | ALDEN, Hardin, IA | Pass | State |
| 2026-06-15 | KANSAS CITY SAUSAGE, LLC , DBA PINE RIDGE FARMS | DES MOINES, Polk, IA | Pass | Local |
| 2026-06-11 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2026-06-11 | MIDAMERICAN ENERGY COMPANY SYCAMORE CTS | JOHNSTON, Polk, IA | Pass | Local |
| 2026-06-10 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2026-06-09 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2026-06-08 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2026-06-04 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-04 | POET BIOREFINING - ARTHUR, LLC — high-priority violation on file | ARTHUR, Ida, IA | Pass | State |
| 2026-06-03 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-03 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-03 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-03 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2026-06-03 | POET BIOREFINING - ARTHUR, LLC — high-priority violation on file | ARTHUR, Ida, IA | Pass | State |
| 2026-06-03 | ABSOLUTE ENERGY LLC-SAINT ANSGAR (MONA) | SAINT ANSGAR, Mitchell, IA | Pass | State |
| 2026-06-03 | VALERO RENEWABLE FUELS CO LLC-HARTLEY — high-priority violation on file | HARTLEY, O'Brien, IA | Pass | State |
| 2026-06-03 | VALERO RENEWABLE FUELS CO LLC-HARTLEY — high-priority violation on file | HARTLEY, O'Brien, IA | Pass | State |
| 2026-06-03 | VALERO RENEWABLE FUELS CO LLC-FT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2026-06-02 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-02 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-02 | ABSOLUTE ENERGY LLC-SAINT ANSGAR (MONA) | SAINT ANSGAR, Mitchell, IA | Fail | State |
| 2026-05-29 | MID AMERICAN ENERGY CO-COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2026-05-28 | MID AMERICAN ENERGY CO-COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2026-05-27 | MID AMERICAN ENERGY CO-COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2026-05-20 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2026-05-20 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Fail | State |
| 2026-05-20 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Fail | State |
| 2026-05-20 | INTEGRATED DNA TECHNOLOGIES | CORALVILLE, Johnson, IA | Pass | State |
| 2026-05-20 | INTEGRATED DNA TECHNOLOGIES | CORALVILLE, Johnson, IA | Pass | State |
| 2026-05-19 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Fail | State |
| 2026-05-19 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-19 | BARKLEY ASPHALT INC | SIOUX CITY, Woodbury, IA | Pass | State |
| 2026-05-15 | NORTHERN NATURAL GAS CO- VENTURA | GARNER, Hancock, IA | Pass | State |
| 2026-05-15 | NORTHERN NATURAL GAS CO- VENTURA | GARNER, Hancock, IA | Pass | State |
| 2026-05-13 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-05-13 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2026-05-13 | MTBT - OTTUMWA | OTTUMWA, Wapello, IA | Pass | State |
| 2026-05-12 | LAKE PARK MUNICIPAL UTILITIES | LAKE PARK, Dickinson, IA | Pass | State |
| 2026-05-12 | LAKE PARK MUNICIPAL UTILITIES | LAKE PARK, Dickinson, IA | Pass | State |
| 2026-05-12 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-05-12 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-05-12 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-05-12 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-05-08 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-08 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-08 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-07 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-07 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-07 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-06 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-06 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-06 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-06 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-06 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-05 | ZINPRO CORP - GARNER — high-priority violation on file | GARNER, Hancock, IA | Fail | State |
| 2026-05-05 | NATURALLY RECYCLED PROTEINS OF IOWA LLC | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2026-05-05 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-04 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-04-30 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2026-04-30 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2026-04-30 | GUARDIAN INDUSTRIES CORP | DE WITT, Clinton, IA | Pass | State |
| 2026-04-30 | SIOUX CITY BRICK & TILE CO | SERGEANT BLUFF, Woodbury, IA | Pass | State |
| 2026-04-30 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Fail | Local |
| 2026-04-29 | UNIVERSITY OF IOWA | IOWA CITY, Johnson, IA | Pass | State |
| 2026-04-29 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Pass | Local |
| 2026-04-28 | CARGILL ANIMAL NUTRITION - SIOUX CITY — high-priority violation on file | SIOUX CITY, Woodbury, IA | Fail | State |
| 2026-04-21 | PANORA MUNICIPAL ELECTRIC | PANORA (HISTORICAL), Guthrie, IA | Pass | State |
| 2026-04-21 | PANORA MUNICIPAL ELECTRIC | PANORA (HISTORICAL), Guthrie, IA | Pass | State |
| 2026-04-21 | PANORA MUNICIPAL ELECTRIC | PANORA (HISTORICAL), Guthrie, IA | Pass | State |
| 2026-04-21 | VAN DIEST SUPPLY CO | WEBSTER CITY, Hamilton, IA | Pass | State |
| 2026-04-16 | ABSOLUTE ENERGY LLC-SAINT ANSGAR (MONA) | SAINT ANSGAR, Mitchell, IA | Pass | State |
| 2026-04-15 | POET BIOREFINING - ARTHUR, LLC — high-priority violation on file | ARTHUR, Ida, IA | Pass | State |
| 2026-04-15 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-04-15 | DES MOINES METRO WRA | DES MOINES, Polk, IA | Pass | Local |
| 2026-04-15 | DES MOINES METRO WRA | DES MOINES, Polk, IA | Pass | Local |
| 2026-04-14 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-04-14 | PELLA CORP-SIOUX CENTER DIV | SIOUX CENTER, Sioux, IA | Pass | State |
| 2026-04-14 | DES MOINES METRO WRA | DES MOINES, Polk, IA | Pass | Local |
| 2026-04-14 | DES MOINES METRO WRA | DES MOINES, Polk, IA | Pass | Local |
| 2026-04-10 | GENERAL MILLS OPERATIONS, INC. — high-priority violation on file | CEDAR RAPIDS, Linn, IA | Fail | Local |
| 2026-04-07 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2026-04-07 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2026-04-07 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2026-04-07 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2026-04-07 | HYCAST FOUNDRY — high-priority violation on file | FAIRFIELD, Jefferson, IA | Fail | State |
| 2026-04-07 | SIBLEY MUNICIPAL UTILITIES | SIBLEY, Osceola, IA | Pass | State |
| 2026-04-03 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Pending | Local |
| 2026-04-02 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Pending | Local |
| 2026-04-02 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Pending | Local |
| 2026-04-01 | IPL � MARSHALLTOWN GENERATING STATION | MARSHALLTOWN, Marshall, IA | Pass | State |
| 2026-04-01 | STRAWBERRY POINT UTILITIES — high-priority violation on file | STRAWBERRY POINT, Clayton, IA | Pass | State |
| 2026-04-01 | STRAWBERRY POINT UTILITIES — high-priority violation on file | STRAWBERRY POINT, Clayton, IA | Pass | State |
| 2026-03-30 | PB LEINER USA | DAVENPORT, Scott, 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.