EPA Air · stack tests by county and year
Air-emissions stack tests in Hardin County, Iowa, 2025
- 22Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Hardin County, Iowa during 2025. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Hardin County facility page.
Hardin County, Iowa, 2025
Air-emissions stack tests in Hardin County, other years
Air-emissions stack tests recorded in Hardin County, Iowa, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-12-18 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-12-18 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-12-17 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-12-17 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-12-10 | CARGILL INC-IOWA FALLS | Pass | State |
| 2025-12-09 | CARGILL INC-IOWA FALLS | Pass | State |
| 2025-12-03 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-12-02 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-12-02 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-09-10 | ILC RESOURCES/IOWA LIMESTONE CO-PLTS 1&3 | Pass | State |
| 2025-09-09 | ILC RESOURCES/IOWA LIMESTONE CO-PLTS 1&3 | Pass | State |
| 2025-08-06 | PLCP, L.P. | Pass | State |
| 2025-08-06 | PLCP, L.P. | Pass | State |
| 2025-06-13 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-06-13 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-06-12 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-06-12 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-06-11 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-06-10 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-06-09 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2025-01-15 | PLCP, L.P. | Pass | State |
| 2025-01-15 | PLCP, L.P. | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.