EPA Air · stack tests by county and year
Air-emissions stack tests in Porter County, Indiana, 2025
- 54Stack 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 Porter County, Indiana 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 Porter County facility page.
Porter County, Indiana, 2025
Air-emissions stack tests in Porter County, other years
Air-emissions stack tests recorded in Porter County, Indiana, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-11-18 | CLEVELAND-CLIFFS BURNS HARBOR LLC — high-priority violation on file | Pass | State |
| 2025-10-09 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-10-09 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-10-09 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-10-09 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | Pass | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | Pass | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | Pass | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | Pass | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | Fail | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | Pass | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | Fail | State |
| 2025-07-16 | CLEVELAND-CLIFFS BURNS HARBOR LLC — high-priority violation on file | Pass | State |
| 2025-07-16 | CLEVELAND-CLIFFS BURNS HARBOR LLC — high-priority violation on file | Pass | State |
| 2025-07-10 | CLEVELAND-CLIFFS BURNS HARBOR LLC — high-priority violation on file | Pass | State |
| 2025-07-10 | CLEVELAND-CLIFFS BURNS HARBOR LLC — high-priority violation on file | Pass | State |
| 2025-06-18 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Pass | State |
| 2025-06-18 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Pass | State |
| 2025-06-18 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Pass | State |
| 2025-06-18 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Pass | State |
| 2025-06-11 | U S STEEL MIDWEST PLANT | Pass | State |
| 2025-06-10 | U S STEEL MIDWEST PLANT | Pass | State |
| 2025-05-29 | MILESTONE CONTRACTORS LP | Pass | State |
| 2025-05-29 | MILESTONE CONTRACTORS LP | Pass | State |
| 2025-05-29 | MILESTONE CONTRACTORS LP | Pass | State |
| 2025-05-29 | MILESTONE CONTRACTORS LP | Pass | State |
| 2025-05-22 | PVS TECHNOLOGIES INC — high-priority violation on file | Pass | State |
| 2025-05-22 | PVS TECHNOLOGIES INC — high-priority violation on file | Pass | State |
| 2025-05-02 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Fail | State |
| 2025-05-02 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Fail | State |
| 2025-05-02 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Fail | State |
| 2025-05-02 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Pass | State |
| 2025-05-01 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Pass | State |
| 2025-05-01 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Pass | State |
| 2025-05-01 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Pass | State |
| 2025-05-01 | O-N MINERALS (PORTAGE) COMPANY LLC DBA CARMEUSE LIME & STONE — high-priority violation on file | Pass | State |
| 2025-04-29 | CLEVELAND-CLIFFS BURNS HARBOR LLC — high-priority violation on file | Pass | State |
| 2025-04-16 | PVS TECHNOLOGIES INC — high-priority violation on file | Pass | State |
| 2025-04-16 | PVS TECHNOLOGIES INC — high-priority violation on file | Pass | State |
| 2025-01-27 | CLEVELAND-CLIFFS BURNS HARBOR 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.