EPA Air · stack tests by county and year
Air-emissions stack tests in Middlesex County, Connecticut, 2025
- 18Stack 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 Middlesex County, Connecticut 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 Middlesex County facility page.
Middlesex County, Connecticut, 2025
Air-emissions stack tests in Middlesex County, other years
Air-emissions stack tests recorded in Middlesex County, Connecticut, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-12-02 | ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION | Pass | State |
| 2025-12-02 | ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION | Pass | State |
| 2025-10-20 | PRATT & WHITNEY, DIVISION OF RTX CORPORATION | Pass | State |
| 2025-09-10 | MIDDLESEX HOSPITAL | Pass | State |
| 2025-08-21 | THE MATTABASSETT DISTRICT — high-priority violation on file | Pass | State |
| 2025-07-01 | ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION | Pass | State |
| 2025-05-12 | MIDDLETOWN POWER LLC | Pass | State |
| 2025-05-09 | MIDDLETOWN POWER LLC | Pass | State |
| 2025-05-07 | MIDDLETOWN POWER LLC | Pass | State |
| 2025-05-06 | MIDDLETOWN POWER LLC | Pass | State |
| 2025-04-16 | ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION | Pass | State |
| 2025-04-11 | MIDDLETOWN POWER LLC | Pass | State |
| 2025-04-11 | MIDDLETOWN POWER LLC | Pass | State |
| 2025-04-09 | MIDDLETOWN POWER LLC | Pass | State |
| 2025-03-06 | PRATT & WHITNEY, DIVISION OF RTX CORPORATION | Pass | State |
| 2025-03-06 | PRATT & WHITNEY, DIVISION OF RTX CORPORATION | Pass | State |
| 2025-03-05 | PRATT & WHITNEY, DIVISION OF RTX CORPORATION | Pass | State |
| 2025-01-30 | PRATT & WHITNEY, DIVISION OF RTX CORPORATION | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.