EPA Air · stack tests by county and year
Air-emissions stack tests in Guthrie County, Iowa, 2025
- 10Stack 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 Guthrie 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 Guthrie County facility page.
Air-emissions stack tests in Guthrie County, other years
Air-emissions stack tests recorded in Guthrie County, Iowa, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-11-12 | POET BIOREFINING - MENLO, LLC | Pass | State |
| 2025-10-28 | POET BIOREFINING - MENLO, LLC | Pass | State |
| 2025-07-02 | POET BIOREFINING - COON RAPIDS, LLC | Pending | State |
| 2025-07-02 | POET BIOREFINING - COON RAPIDS, LLC | Pass | State |
| 2025-07-02 | POET BIOREFINING - COON RAPIDS, LLC | Pass | State |
| 2025-07-02 | POET BIOREFINING - COON RAPIDS, LLC | Pass | State |
| 2025-07-02 | POET BIOREFINING - COON RAPIDS, LLC | Pass | State |
| 2025-06-04 | POET BIOREFINING - MENLO, LLC | Pass | State |
| 2025-05-01 | POET BIOREFINING - MENLO, LLC | Pass | State |
| 2025-05-01 | POET BIOREFINING - MENLO, LLC | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.