EPA Air · stack tests by county and year
Air-emissions stack tests in Warren 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 Warren 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 Warren County facility page.
Warren County, Iowa, 2025
Air-emissions stack tests in Warren County, other years
- 2024 12
Air-emissions stack tests recorded in Warren County, Iowa, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-11-13 | OSMIUM DATA CENTER — high-priority violation on file | Fail | State |
| 2025-11-10 | OSMIUM DATA CENTER — high-priority violation on file | Fail | State |
| 2025-10-22 | OSMIUM DATA CENTER — high-priority violation on file | Fail | State |
| 2025-10-22 | OSMIUM DATA CENTER — high-priority violation on file | Fail | State |
| 2025-01-17 | OSMIUM DATA CENTER — high-priority violation on file | Pass | State |
| 2025-01-16 | OSMIUM DATA CENTER — high-priority violation on file | Fail | State |
| 2025-01-14 | OSMIUM DATA CENTER — 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.