EPA Air · stack tests by county and year
Air-emissions stack tests in Montgomery County, Pennsylvania, 2025
- 15Stack 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 Montgomery County, Pennsylvania 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 Montgomery County facility page.
Montgomery County, Pennsylvania, 2025
Air-emissions stack tests in Montgomery County, other years
Air-emissions stack tests recorded in Montgomery County, Pennsylvania, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-12-19 | MCC MFG INC/LAFAYETTE HILL — high-priority violation on file | Pass | State |
| 2025-12-11 | HATFIELD TWP MUNI AUTH/COLMAR | Fail | State |
| 2025-11-21 | REWORLD PLYMOUTH/ PLYMOUTH — high-priority violation on file | Pass | State |
| 2025-11-12 | JANSSEN RESEARCH & DEVELOPMENT LLC/LOWER GWYNEDD | Pass | State |
| 2025-10-28 | MERCK SHARP & DOHME LLC/WEST PT | Pass | State |
| 2025-10-09 | GLAXO SMITHKLINE/UPPER PROVIDENCE — high-priority violation on file | Pass | State |
| 2025-10-03 | INNOVATION 411/UPPER MERION — high-priority violation on file | Pass | State |
| 2025-09-23 | PECORA CORP/PECORA | Pass | State |
| 2025-09-18 | ABINGTON MEM HOSP/ABINGTON | Pass | State |
| 2025-06-27 | OPTINOVA VALLEY FORGE/PLYMOUTH MEETING | Pass | State |
| 2025-06-12 | MERCK SHARP & DOHME LLC/WEST PT | Pass | State |
| 2025-06-06 | HIGHWAY MATERIALS INC/PLYMOUTH MTG ASPHALT PLT | Pass | State |
| 2025-04-03 | MERCK SHARP & DOHME LLC/WEST PT | Pass | State |
| 2025-02-28 | OPTINOVA VALLEY FORGE/PLYMOUTH MEETING | Pass | State |
| 2025-02-27 | TITAN INTL/POTTSTOWN — high-priority violation on file | Fail | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.