EPA Air · stack tests by state and year
Air-emissions stack tests in Connecticut, 2025
- 178Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Connecticut during 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Connecticut, 2025
- New Haven County 63
- Hartford County 33
- New London County 24
- Middlesex County 18
- Fairfield County 13
- Litchfield County 10
- Windham County 9
- Tolland County 4
- Undetermined County 4
Connecticut, other years
Air-emissions stack tests recorded in Connecticut, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-18 | KONGSBERG AUTOMOTIVE — high-priority violation on file | SUFFIELD, Hartford, CT | Fail | State |
| 2025-12-17 | AMGRAPH PACKAGING, INC. | WATERTOWN, Litchfield, CT | Pass | State |
| 2025-12-11 | MANCHESTER LANDFILL | MANCHESTER, Hartford, CT | Pass | State |
| 2025-12-11 | BUCKEYE PT TERMINALS, L.P. - WATERFRONT STREET TERMINAL | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-12-10 | COVIDIEN LP | NORTH HAVEN, New Haven, CT | Pass | State |
| 2025-12-09 | BUCKEYE PT TERMINALS, L.P. - FORBES AVENUE TERMINAL | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-12-03 | THE JACKSON LABORATORY FOR GENOMIC MEDICINE — high-priority violation on file | FARMINGTON, Hartford, CT | Pass | State |
| 2025-12-02 | KIMBERLY-CLARK CORPORATION, NEW MILFORD MILL — high-priority violation on file | NEW MILFORD, Litchfield, CT | Pass | State |
| 2025-12-02 | ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION | CROMWELL, Middlesex, CT | Pass | State |
| 2025-12-02 | ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION | CROMWELL, Middlesex, CT | Pass | State |
| 2025-11-18 | SONOCO PROTECTIVE SOLUTIONS | PUTNAM, Windham, CT | Pass | State |
| 2025-11-12 | SECURE MARK DECAL | TRUMBULL, Fairfield, CT | Pass | State |
| 2025-11-05 | GLANBIA NUTRITIONALS (NA) INC. — high-priority violation on file | WEST HAVEN, New Haven, CT | Pass | State |
| 2025-10-30 | AHLSTROM NONWOVENS, LLC | WINDSOR LOCKS, Hartford, CT | Pass | State |
| 2025-10-30 | GB II NEW HAVEN, LLC - NEW HAVEN HARBOR STATION | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-10-29 | GB II NEW HAVEN, LLC - NEW HAVEN HARBOR STATION | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-10-29 | GB II NEW HAVEN, LLC - NEW HAVEN HARBOR STATION | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-10-24 | UNIVERSITY OF CONNECTICUT STORRS CAMPUS | MANSFIELD DEPOT, Tolland, CT | Pass | State |
| 2025-10-24 | UNIVERSITY OF CONNECTICUT STORRS CAMPUS | MANSFIELD DEPOT, Tolland, CT | Pass | State |
| 2025-10-23 | UNIVERSITY OF CONNECTICUT STORRS CAMPUS | MANSFIELD DEPOT, Tolland, CT | Pass | State |
| 2025-10-20 | PRATT & WHITNEY, DIVISION OF RTX CORPORATION | MIDDLETOWN, Middlesex, CT | Pass | State |
| 2025-10-15 | REWORLD BRISTOL, INC. | BRISTOL, Hartford, CT | Pass | State |
| 2025-10-15 | WATERBURY GENERATION, LLC | WATERBURY, New Haven, CT | Pass | State |
| 2025-10-15 | ALGONQUIN GAS TRANSMISSION, LLC - CHAPLIN COMPRESSOR STATION | CHAPLIN, Windham, CT | Pass | State |
| 2025-10-14 | REWORLD BRISTOL, INC. | BRISTOL, Hartford, CT | Pass | State |
| 2025-10-01 | AHLSTROM NONWOVENS, LLC | WINDSOR LOCKS, Hartford, CT | Pass | State |
| 2025-10-01 | REWORLD CONNECTICUT COMPANY — high-priority violation on file | PRESTON, New London, CT | Pass | State |
| 2025-09-30 | SIKORSKY AIRCRAFT - MAIN PLANT | STRATFORD, Fairfield, CT | Pass | State |
| 2025-09-30 | AHLSTROM NONWOVENS, LLC | WINDSOR LOCKS, Hartford, CT | Pass | State |
| 2025-09-30 | REWORLD CONNECTICUT COMPANY — high-priority violation on file | PRESTON, New London, CT | Pass | State |
| 2025-09-29 | SIKORSKY AIRCRAFT - MAIN PLANT | STRATFORD, Fairfield, CT | Pass | State |
| 2025-09-25 | NAUGATUCK WPCA/POTW | NAUGATUCK (HISTORICAL), New Haven, CT | Pass | State |
| 2025-09-24 | CITY OF WATERBURY WPCF | WATERBURY, New Haven, CT | Pass | State |
| 2025-09-17 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - BRIDGE STREET SITE — high-priority violation on file | GROTON, New London, CT | Pass | State |
| 2025-09-16 | EAST SHORE WATER POLL ABATEMENT FACILITY | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-09-16 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - WATER TREATMENT PLANT — high-priority violation on file | GROTON, New London, CT | Pass | State |
| 2025-09-11 | ROEHM AMERICA, LLC — high-priority violation on file | WALLINGFORD, New Haven, CT | Pass | State |
| 2025-09-11 | SOLVENTUM PURIFICATION, INC | MERIDEN, New Haven, CT | Pass | State |
| 2025-09-11 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - JEWETT CITY SITE — high-priority violation on file | GRISWOLD, New London, CT | Pass | State |
| 2025-09-11 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Fail | State |
| 2025-09-10 | MIDDLESEX HOSPITAL | MIDDLETOWN, Middlesex, CT | Pass | State |
| 2025-09-10 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Fail | State |
| 2025-09-09 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Fail | State |
| 2025-09-09 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Fail | State |
| 2025-09-04 | HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file | HARTFORD, Hartford, CT | Pass | State |
| 2025-09-03 | HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file | HARTFORD, Hartford, CT | Pass | State |
| 2025-09-03 | ALGONQUIN GAS TRANSMISSION, LLC - CHAPLIN COMPRESSOR STATION | CHAPLIN, Windham, CT | Pass | State |
| 2025-09-02 | HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file | HARTFORD, Hartford, CT | Pass | State |
| 2025-08-26 | SCAPA TAPE NORTH AMERICA | WINDSOR, Hartford, CT | Pass | State |
| 2025-08-21 | THE MATTABASSETT DISTRICT — high-priority violation on file | CROMWELL, Middlesex, CT | Pass | State |
| 2025-08-21 | DEVON POWER LLC | DEVON, New Haven, CT | Pass | State |
| 2025-08-20 | DEVON POWER LLC | DEVON, New Haven, CT | Pass | State |
| 2025-08-19 | DEVON POWER LLC | DEVON, New Haven, CT | Pass | State |
| 2025-08-19 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE | NORWICH, New London, CT | Pass | State |
| 2025-08-19 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE | NORWICH, New London, CT | Pass | State |
| 2025-08-15 | DEVON POWER LLC | DEVON, New Haven, CT | Pass | State |
| 2025-08-14 | ETHOSENERGY ACCESSORIES AND COMPONENTS, LLC | EAST WINDSOR, Hartford, CT | Pass | State |
| 2025-08-12 | BEDOUKIAN RESEARCH, INC | DANBURY, Fairfield, CT | Pass | State |
| 2025-08-12 | APS TECHNOLOGY | WALLINGFORD, New Haven, CT | Pass | State |
| 2025-08-08 | TILCON CONNECTICUT INC. - PLAINFIELD (WAUREGAN) | WAUREGAN, Windham, CT | Pass | State |
| 2025-08-01 | AMETEK, SPECIALTY METAL PRODUCTS | WALLINGFORD, New Haven, CT | Pass | State |
| 2025-07-29 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - GARY COURT SUBSTATION | GROTON, New London, CT | Pass | State |
| 2025-07-29 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - GARY COURT SUBSTATION | GROTON, New London, CT | Pass | State |
| 2025-07-22 | HYTONE AG-GRID, LLC | COVENTRY, Tolland, CT | Pass | State |
| 2025-07-17 | THE JACKSON LABORATORY FOR GENOMIC MEDICINE — high-priority violation on file | FARMINGTON, Hartford, CT | Fail | State |
| 2025-07-17 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - BRIDGE STREET SITE — high-priority violation on file | GROTON, New London, CT | Pass | State |
| 2025-07-15 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - WATER TREATMENT PLANT — high-priority violation on file | GROTON, New London, CT | Pass | State |
| 2025-07-02 | HIGHWAY SAFETY CORP / CT GALVANIZING | GLASTONBURY, Hartford, CT | Fail | State |
| 2025-07-02 | RAND-WHITNEY CONTAINER BOARD LP | MONTVILLE, TOWN OF, New London, CT | Pass | State |
| 2025-07-01 | ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION | CROMWELL, Middlesex, CT | Pass | State |
| 2025-06-30 | PLAINFIELD PIKE, LLC | PLAINFIELD, Litchfield, CT | Pass | State |
| 2025-06-27 | ITW GRAPHICS | MANCHESTER, Hartford, CT | Pass | State |
| 2025-06-19 | PLAINFIELD RENEWABLE ENERGY LLC | PLAINFIELD, Litchfield, CT | Pass | State |
| 2025-06-19 | PFIZER GLOBAL MANUFACTURING | GROTON (HISTORICAL), New London, CT | Pass | State |
| 2025-06-16 | YALE UNIVERSITY, SCHOOL OF MEDICINE PREMISES | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-06-13 | YALE UNIVERSITY, SCHOOL OF MEDICINE PREMISES | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-06-12 | U S NAVAL SUBMARINE BASE — high-priority violation on file | GROTON (HISTORICAL), New London, CT | Pass | State |
| 2025-06-11 | U S NAVAL SUBMARINE BASE — high-priority violation on file | GROTON (HISTORICAL), New London, CT | Pass | State |
| 2025-06-05 | TILCON CONNECTICUT - WALLINGFORD PLANT | WALLINGFORD, New Haven, CT | Pass | State |
| 2025-05-30 | STRATEGIC MATERIALS | SOUTH WINDSOR, Hartford, CT | Fail | State |
| 2025-05-30 | STRATEGIC MATERIALS | SOUTH WINDSOR, Hartford, CT | Pass | State |
| 2025-05-30 | SHELL OIL PRODUCTS US | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-05-23 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - LEBANON PINES SITE | LEBANON, New London, CT | Pass | State |
| 2025-05-23 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - LEBANON PINES SITE | LEBANON, New London, CT | Pass | State |
| 2025-05-15 | WHEELABRATOR LISBON INC. | CONNECTICUT, Undetermined, CT | Pass | State |
| 2025-05-15 | WHEELABRATOR LISBON INC. | CONNECTICUT, Undetermined, CT | Pass | State |
| 2025-05-14 | PALM ENERGY LLC | BRISTOL, Hartford, CT | Pass | State |
| 2025-05-13 | DEVON POWER LLC | DEVON, New Haven, CT | Pass | State |
| 2025-05-12 | MIDDLETOWN POWER LLC | MIDDLETOWN, Middlesex, CT | Pass | State |
| 2025-05-09 | MIDDLETOWN POWER LLC | MIDDLETOWN, Middlesex, CT | Pass | State |
| 2025-05-09 | DEVON POWER LLC | DEVON, New Haven, CT | Pass | State |
| 2025-05-09 | CONNECTICUT JET POWER - BRANFORD STATION | BRANFORD, New Haven, CT | Pass | State |
| 2025-05-09 | CONNECTICUT JET POWER - BRANFORD STATION | BRANFORD, New Haven, CT | Pass | State |
| 2025-05-08 | CONNECTICUT JET POWER - COS COB STATION | GREENWICH, Fairfield, CT | Pass | State |
| 2025-05-08 | CONNECTICUT JET POWER - COS COB STATION | GREENWICH, Fairfield, CT | Pass | State |
| 2025-05-08 | WHEELABRATOR BRIDGEPORT LP | BRIDGEPORT, Fairfield, CT | Pass | State |
| 2025-05-08 | DEVON POWER LLC | DEVON, New Haven, CT | Pass | State |
| 2025-05-07 | WHEELABRATOR BRIDGEPORT LP | BRIDGEPORT, Fairfield, CT | Pass | State |
| 2025-05-07 | CONNECTICUT JET POWER - FRANKLIN DRIVE STATION | TORRINGTON, Litchfield, CT | Pass | State |
| 2025-05-07 | CONNECTICUT JET POWER - FRANKLIN DRIVE STATION | TORRINGTON, Litchfield, CT | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.