EPA Air · stack tests by county and year
Air-emissions stack tests in Clayton County, Iowa, 2026
- 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 Clayton 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 Clayton County facility page.
Air-emissions stack tests in Clayton County, other years
What stands out
- Stack tests in Clayton County, Iowa, rose from 3 in 2023, the previous year on file, to 4 in 2026.
- The county’s file for stack tests holds 5 years of events, from 2017 through 2026.
- Its 4 stack tests rank 17th of the 32 county cells in Iowa for 2026.
- Its 4 stack tests are 1.6% of the 250 the state’s file holds for 2026.
Every line is computed by formula from the state’s stored file; nothing is estimated.
Air-emissions stack tests recorded in Clayton County, Iowa, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-06-26 | PRAIRIE FARMS DAIRY | Pass | State |
| 2026-06-26 | PRAIRIE FARMS DAIRY | Pass | State |
| 2026-04-01 | STRAWBERRY POINT UTILITIES — high-priority violation on file | Pass | State |
| 2026-04-01 | STRAWBERRY POINT UTILITIES — 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.