EPA Air · stack tests by county and year
Air-emissions stack tests in Middlesex County, Connecticut, 2026
- 9Stack 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 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 Middlesex County facility page.
Air-emissions stack tests in Middlesex County, other years
Air-emissions stack tests recorded in Middlesex County, Connecticut, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-06-30 | THE MATTABASSETT DISTRICT — high-priority violation on file | Pass | State |
| 2026-05-01 | MIDDLETOWN POWER LLC | Pending | State |
| 2026-04-29 | MIDDLETOWN POWER LLC | Pass | State |
| 2026-04-27 | MIDDLETOWN POWER LLC | Pass | State |
| 2026-03-11 | PRATT & WHITNEY, DIVISION OF RTX CORPORATION | Pass | State |
| 2026-03-10 | PRATT & WHITNEY, DIVISION OF RTX CORPORATION | Pass | State |
| 2026-02-27 | KLEEN ENERGY SYSTEMS, LLC | Pass | State |
| 2026-02-26 | KLEEN ENERGY SYSTEMS, LLC | Pass | State |
| 2026-02-26 | KLEEN ENERGY SYSTEMS, LLC | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.