EPA Air · stack tests by county and year
Air-emissions stack tests in Hardin County, Iowa, 2026
- 15Stack 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 2026. 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.
Air-emissions stack tests in Hardin County, other years
Air-emissions stack tests recorded in Hardin County, Iowa, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-06-16 | MARTIN MARIETTA INC-ALDEN | Pass | State |
| 2026-05-20 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Fail | State |
| 2026-05-19 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2026-05-08 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2026-05-07 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2026-05-06 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2026-05-06 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2026-05-06 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | Pass | State |
| 2026-05-05 | NATURALLY RECYCLED PROTEINS OF IOWA LLC | Pass | State |
| 2026-03-26 | PLCP, L.P. | Pass | State |
| 2026-03-26 | PLCP, L.P. | Pass | State |
| 2026-03-25 | PLCP, L.P. | Pass | State |
| 2026-03-25 | PLCP, L.P. | Pass | State |
| 2026-01-06 | CARGILL INC-IOWA FALLS | Pass | State |
| 2026-01-05 | CARGILL INC-IOWA FALLS | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.