EPA Air · stack tests by state and year

Air-emissions stack tests in Connecticut, 2026

68Stack 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 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Counties in Connecticut, 2026

Connecticut, other years

Air-emissions stack tests recorded in Connecticut, 2026

Date	Facility	Where	Kind	Agency
2026-08-20	YALE UNIVERSITY / CENTRAL POWER PLANT	NEW HAVEN, New Haven, CT	Pending	State
2026-08-19	YALE UNIVERSITY / CENTRAL POWER PLANT	NEW HAVEN, New Haven, CT	Pending	State
2026-07-30	HYTONE AG-GRID, LLC	COVENTRY, Tolland, CT	Pass	State
2026-07-17	ITW GRAPHICS	MANCHESTER, Hartford, CT	Pending	State
2026-07-16	GB II NEW HAVEN, LLC - NEW HAVEN HARBOR STATION	NEW HAVEN, New Haven, CT	Pending	State
2026-07-15	GB II NEW HAVEN, LLC - NEW HAVEN HARBOR STATION	NEW HAVEN, New Haven, CT	Pending	State
2026-07-15	GB II NEW HAVEN, LLC - NEW HAVEN HARBOR STATION	NEW HAVEN, New Haven, CT	Pending	State
2026-07-15	FRITO-LAY, INC.	DAYVILLE, Windham, CT	Pending	State
2026-07-13	FAIRFIELD UNIVERSITY	FAIRFIELD, Fairfield, CT	Pending	State
2026-07-01	BRIDGEPORT ENERGY LLC	BRIDGEPORT, Fairfield, CT	Pass	State
2026-06-30	BRIDGEPORT ENERGY LLC	BRIDGEPORT, Fairfield, CT	Pass	State
2026-06-30	THE MATTABASSETT DISTRICT — high-priority violation on file	CROMWELL, Middlesex, CT	Pass	State
2026-06-30	PALL CORPORATION	PUTNAM, Windham, CT	Pass	State
2026-06-25	U S NAVAL SUBMARINE BASE — high-priority violation on file	GROTON (HISTORICAL), New London, CT	Pass	State
2026-06-25	U S NAVAL SUBMARINE BASE — high-priority violation on file	GROTON (HISTORICAL), New London, CT	Pass	State
2026-06-24	U S NAVAL SUBMARINE BASE — high-priority violation on file	GROTON (HISTORICAL), New London, CT	Pass	State
2026-06-23	U S NAVAL SUBMARINE BASE — high-priority violation on file	GROTON (HISTORICAL), New London, CT	Pass	State
2026-06-18	EAST SHORE WATER POLL ABATEMENT FACILITY	NEW HAVEN, New Haven, CT	Pass	State
2026-06-15	MONTVILLE POWER LLC	CONNECTICUT, Undetermined, CT	Pass	State
2026-06-15	MONTVILLE POWER LLC	CONNECTICUT, Undetermined, CT	Pass	State
2026-06-10	HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file	HARTFORD, Hartford, CT	Fail	State
2026-06-09	HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file	HARTFORD, Hartford, CT	Pending	U.S. EPA
2026-06-08	HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file	HARTFORD, Hartford, CT	Fail	State
2026-06-03	PLAINFIELD RENEWABLE ENERGY LLC	PLAINFIELD, Litchfield, CT	Pass	State
2026-06-03	PLAINFIELD RENEWABLE ENERGY LLC	PLAINFIELD, Litchfield, CT	Fail	State
2026-06-02	STAMFORD WPCA	STAMFORD, Fairfield, CT	Pass	State
2026-05-21	ELECTRIC BOAT CORPORATION — high-priority violation on file	GROTON (HISTORICAL), New London, CT	Pass	State
2026-05-21	WHEELABRATOR LISBON INC.	CONNECTICUT, Undetermined, CT	Pass	State
2026-05-21	WHEELABRATOR LISBON INC.	CONNECTICUT, Undetermined, CT	Pass	State
2026-05-14	WHEELABRATOR BRIDGEPORT LP	BRIDGEPORT, Fairfield, CT	Pass	State
2026-05-13	WHEELABRATOR BRIDGEPORT LP	BRIDGEPORT, Fairfield, CT	Pass	State
2026-05-12	BIMBO BAKERIES USA, INC.	GREENWICH, Fairfield, CT	Pass	State
2026-05-12	WHEELABRATOR BRIDGEPORT LP	BRIDGEPORT, Fairfield, CT	Pass	State
2026-05-06	ALLIED PRINTING SERVICES, INC	MANCHESTER, Hartford, CT	Pass	State
2026-05-05	ALLIED PRINTING SERVICES, INC	MANCHESTER, Hartford, CT	Pass	State
2026-05-01	MIDDLETOWN POWER LLC	MIDDLETOWN, Middlesex, CT	Pending	State
2026-05-01	TILCON CONNECTICUT - WATERBURY PLANT	WATERBURY, New Haven, CT	Fail	State
2026-04-29	MIDDLETOWN POWER LLC	MIDDLETOWN, Middlesex, CT	Pass	State
2026-04-28	BIMBO BAKERIES USA, INC.	GREENWICH, Fairfield, CT	Pass	State
2026-04-27	MIDDLETOWN POWER LLC	MIDDLETOWN, Middlesex, CT	Pass	State
2026-04-21	FORT HILL AG GRID, LLC	THOMPSON, Windham, CT	Pass	State
2026-04-09	BIC CONSUMER PRODUCTS MANUFACTURING CO	MILFORD, New Haven, CT	Pending	State
2026-04-01	IROQUOIS PIPELINE OPERATING COMPANY - BROOKFIELD COMPRESSOR STATION	BROOKFIELD, Fairfield, CT	Pass	State
2026-04-01	LUVATA WATERBURY, INC.	WATERBURY, New Haven, CT	Pass	State
2026-04-01	ALGONQUIN GAS TRANSMISSION LLC - OXFORD COMPRESSOR STATION	OXFORD, New Haven, CT	Pass	State
2026-03-31	IROQUOIS PIPELINE OPERATING COMPANY - BROOKFIELD COMPRESSOR STATION	BROOKFIELD, Fairfield, CT	Pass	State
2026-03-18	ALGONQUIN GAS TRANSMISSION, LLC - CHAPLIN COMPRESSOR STATION	CHAPLIN, Windham, CT	Pass	State
2026-03-17	ALGONQUIN GAS TRANSMISSION, LLC - CHAPLIN COMPRESSOR STATION	CHAPLIN, Windham, CT	Pass	State
2026-03-17	ALGONQUIN GAS TRANSMISSION, LLC - CHAPLIN COMPRESSOR STATION	CHAPLIN, Windham, CT	Pass	State
2026-03-11	PRATT & WHITNEY, DIVISION OF RTX CORPORATION	MIDDLETOWN, Middlesex, CT	Pass	State
2026-03-10	PRATT & WHITNEY, DIVISION OF RTX CORPORATION	MIDDLETOWN, Middlesex, CT	Pass	State
2026-03-05	PFIZER GLOBAL MANUFACTURING	GROTON (HISTORICAL), New London, CT	Pass	State
2026-02-27	KLEEN ENERGY SYSTEMS, LLC	MIDDLETOWN, Middlesex, CT	Pass	State
2026-02-26	KLEEN ENERGY SYSTEMS, LLC	MIDDLETOWN, Middlesex, CT	Pass	State
2026-02-26	KLEEN ENERGY SYSTEMS, LLC	MIDDLETOWN, Middlesex, CT	Pass	State
2026-02-25	BRADLEY INTERNATIONAL AIRPORT / AMERESCO SELECT, INC.	WINDSOR LOCKS, Hartford, CT	Pass	State
2026-02-09	YALE UNIVERSITY WEST CAMPUS	WEST HAVEN, New Haven, CT	Pass	State
2026-01-29	HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file	HARTFORD, Hartford, CT	Fail	State
2026-01-22	HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file	HARTFORD, Hartford, CT	Fail	State
2026-01-22	YALE UNIVERSITY / CENTRAL POWER PLANT	NEW HAVEN, New Haven, CT	Pass	State
2026-01-22	YALE UNIVERSITY / CENTRAL POWER PLANT	NEW HAVEN, New Haven, CT	Pass	State
2026-01-22	YALE UNIVERSITY / CENTRAL POWER PLANT	NEW HAVEN, New Haven, CT	Pass	State
2026-01-15	HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file	HARTFORD, Hartford, CT	Pass	State
2026-01-15	MONTVILLE POWER LLC	CONNECTICUT, Undetermined, CT	Pass	State
2026-01-15	MONTVILLE POWER LLC	CONNECTICUT, Undetermined, CT	Pass	State
2026-01-07	BOEHRINGER INGELHEIM PHARMACEUTICALS INC	RIDGEFIELD, Fairfield, CT	Pass	State
2026-01-07	BOEHRINGER INGELHEIM PHARMACEUTICALS INC	RIDGEFIELD, Fairfield, CT	Pass	State
2026-01-07	SWISS CLEANERS	ROCKVILLE, Tolland, CT	Pending	State

Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.