EPA Air · stack tests by county and year
Air-emissions stack tests in Douglas County, Wisconsin, 2025
- 14Stack 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 Douglas County, Wisconsin 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 Douglas County facility page.
Douglas County, Wisconsin, 2025
Air-emissions stack tests in Douglas County, other years
Air-emissions stack tests recorded in Douglas County, Wisconsin, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-10-07 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | Pass | State |
| 2025-10-07 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | Pass | State |
| 2025-09-09 | GRAYMONT (WI) LLC — high-priority violation on file | Pass | State |
| 2025-07-28 | GRAYMONT (WI) LLC — high-priority violation on file | Pass | State |
| 2025-07-09 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | Pass | State |
| 2025-07-09 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | Pass | State |
| 2025-07-08 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | Pass | State |
| 2025-04-17 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | Pass | State |
| 2025-04-16 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | Pass | State |
| 2025-04-15 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | Pass | State |
| 2025-02-12 | GRAYMONT (WI) LLC — high-priority violation on file | Pass | State |
| 2025-01-29 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | Pass | State |
| 2025-01-29 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | Pass | State |
| 2025-01-28 | SUPERIOR REFINING COMPANY 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 Douglas county, WI, for 2025. It lists 14 stack tests recorded in 2025.