EPA Air · stack tests by county and year
Air-emissions stack tests in Marshall County, Iowa, 2025
- 4Stack 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 Marshall 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 Marshall County facility page.
Marshall County, Iowa, 2025
Air-emissions stack tests in Marshall County, other years
Air-emissions stack tests recorded in Marshall County, Iowa, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-10-22 | IPL � MARSHALLTOWN GENERATING STATION | Pass | State |
| 2025-10-22 | IPL � MARSHALLTOWN GENERATING STATION | Pass | State |
| 2025-10-10 | IPL � MARSHALLTOWN GENERATING STATION | Pass | State |
| 2025-04-03 | MTBT - MARSHALLTOWN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.