EPA Air · stack tests by county and year
Air-emissions stack tests in Butler County, Iowa, 2025
- 7Stack 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 Butler 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 Butler County facility page.
Butler County, Iowa, 2025
Air-emissions stack tests in Butler County, other years
Air-emissions stack tests recorded in Butler County, Iowa, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-06-05 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | Pass | State |
| 2025-06-04 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | Pass | State |
| 2025-06-04 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | Fail | State |
| 2025-06-04 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | Pass | State |
| 2025-04-17 | TRINITYRAIL MAINTENANCE SERVICES | Pass | State |
| 2025-03-27 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | Pass | State |
| 2025-03-26 | POET BIOREFINING - SHELL ROCK, LLC — high-priority violation on file | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in Butler county, IA, in 2025. Stack tests recorded in 2025: 7.