EPA Air · stack tests by county and year
Air-emissions stack tests in Marathon County, Wisconsin, 2026
- 12Stack 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 Marathon County, Wisconsin 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 Marathon County facility page.
Marathon County, Wisconsin, 2026
Air-emissions stack tests in Marathon County, other years
Air-emissions stack tests recorded in Marathon County, Wisconsin, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-07-15 | CRYSTAL FINISHING SYSTEMS INC | Pass | State |
| 2026-06-30 | WI PUBLIC SERVICE WESTON POWER PLANT | Pass | State |
| 2026-06-29 | WI PUBLIC SERVICE WESTON POWER PLANT | Pass | State |
| 2026-06-24 | WI PUBLIC SERVICE WESTON POWER PLANT | Pass | State |
| 2026-06-23 | WI PUBLIC SERVICE WESTON POWER PLANT | Pass | State |
| 2026-06-23 | WI PUBLIC SERVICE WESTON POWER PLANT | Pass | State |
| 2026-06-22 | WI PUBLIC SERVICE WESTON POWER PLANT | Pass | State |
| 2026-06-16 | APOGEE WAUSAU GROUP INC LINETEC DIVISION — high-priority violation on file | Pass | State |
| 2026-06-09 | WISCONSIN ELECTRIC POWER COMPANY (DBA WE ENERGIES) - ROTHSCHILD BIOMASS COGENERA — high-priority violation on file | Pass | State |
| 2026-04-07 | AHLSTROM MOSINEE, LLC — high-priority violation on file | Pass | State |
| 2026-03-16 | AHLSTROM MOSINEE, LLC — high-priority violation on file | Pass | State |
| 2026-02-11 | CRYSTAL FINISHING SYSTEMS INC | 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 Marathon county, WI, for 2026. Stack tests recorded in 2026 total 12.