EPA Air · stack tests by county and year
Air-emissions stack tests in Butler County, Pennsylvania, 2025
- 30Stack 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 Butler 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 Butler County facility page.
Butler County, Pennsylvania, 2025
Air-emissions stack tests in Butler County, other years
Air-emissions stack tests recorded in Butler County, Pennsylvania, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-12-19 | MTN GATHERING LLC/JEFFERSON COMP STA | Pass | State |
| 2025-12-12 | LUXFER MAGTECH SAXONBURG PLT | Pass | State |
| 2025-12-11 | CALUMET KARNS CITY REF LLC/KARNS CITY | Pass | State |
| 2025-11-14 | BNZ MATERIALS INC/ZELIENOPLE | Pass | State |
| 2025-11-11 | IRON MOUNTAIN INFORMATION MANAGEMENT LLC/BOYERS | Pass | State |
| 2025-10-22 | MARKWEST LIBERTY BLUESTONE LLC/VOLL COMP STA | Pass | State |
| 2025-10-13 | PINE RUN MIDSTREAM LLC/BICKER COMP STA | Pass | State |
| 2025-10-07 | PA STATE SYS OF HIGHER ED/SLIPPERY ROCK UNIV PA | Pass | State |
| 2025-10-03 | ONEIDA VALLEY MIDSTRAM LLC/CONSTELLATION COMP STA | Pass | State |
| 2025-09-18 | MARKWEST LIBERTY BLUESTONE LLC/BLUESTONE GAS PROC PLT | Pass | State |
| 2025-09-17 | MARKWEST LIBERTY BLUESTONE LLC/SARSEN GAS PROC PLT | Pass | State |
| 2025-09-16 | ETC NORTHEAST PIPELINE/GALAXY COMP STA | Pass | State |
| 2025-09-03 | ARMSTRONG CEMENT & SUPPLY/WINFIELD — high-priority violation on file | Pass | State |
| 2025-09-03 | MARKWEST LIBERTY BLUESTONE LLC/BLUESTONE GAS PROC PLT | Pass | State |
| 2025-08-29 | MARKWEST LIBERTY BLUESTONE LLC/TRILLITH COMP STA | Pass | State |
| 2025-08-28 | SONNEBORN INC/PETROLIA PLT | Pass | State |
| 2025-08-15 | COMMERCIAL ASPHALT SUPPLY/FENELTON | Fail | State |
| 2025-08-07 | MTN GATHERING LLC/JEFFERSON COMP STA | Fail | State |
| 2025-08-07 | MTN GATHERING LLC/JEFFERSON COMP STA | Pass | State |
| 2025-07-24 | MARKWEST LIBERTY BLUESTONE LLC/ROYAL OAK COMP STA | Pass | State |
| 2025-07-23 | UGI MORAINE EAST GATHERING LLC/RENICK COMP STA | Pass | State |
| 2025-07-22 | UGI MORAINE EAST GATHERING LLC/RENICK COMP STA | Pass | State |
| 2025-07-08 | PINE RUN MIDSTREAM LLC/BASS COMP STA | Pass | State |
| 2025-05-30 | ARMSTRONG CEMENT & SUPPLY/WINFIELD — high-priority violation on file | Pass | State |
| 2025-05-30 | MTN GATHERING LLC/FORWARD COMP STA | Pass | State |
| 2025-05-27 | MARKWEST LIBERTY BLUESTONE LLC/SARSEN GAS PROC PLT | Pass | State |
| 2025-05-20 | MARKWEST LIBERTY BLUESTONE LLC/BLUESTONE GAS PROC PLT | Pass | State |
| 2025-05-08 | SENECA LANDFILL INC/SENECA | Pass | State |
| 2025-03-26 | ARMSTRONG CEMENT & SUPPLY/WINFIELD — high-priority violation on file | Pass | State |
| 2025-03-05 | MARKWEST LIBERTY BLUESTONE LLC/VOLL COMP STA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.