EPA Air · stack tests by state and year

Air-emissions stack tests in Indiana, 2026

1,010Stack 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 Indiana 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 Indiana, 2026

Indiana, other years

Air-emissions stack tests recorded in Indiana, 2026

Date	Facility	Where	Kind	Agency
2026-04-22	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State
2026-04-22	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State
2026-04-22	METAL TECHNOLOGIES AUBURN LLC — high-priority violation on file	AUBURN, DeKalb, IN	Pass	State
2026-04-22	METAL TECHNOLOGIES AUBURN LLC — high-priority violation on file	AUBURN, DeKalb, IN	Pass	State
2026-04-22	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-22	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-22	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-22	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-22	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-22	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-22	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-22	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-22	KNAUF INSULATION INCORPORATED — high-priority violation on file	SHELBYVILLE, Shelby, IN	Pass	State
2026-04-22	KNAUF INSULATION INCORPORATED — high-priority violation on file	SHELBYVILLE, Shelby, IN	Pass	State
2026-04-22	KNAUF INSULATION INCORPORATED — high-priority violation on file	SHELBYVILLE, Shelby, IN	Pass	State
2026-04-22	KNAUF INSULATION INCORPORATED — high-priority violation on file	SHELBYVILLE, Shelby, IN	Pass	State
2026-04-22	KNAUF INSULATION INCORPORATED — high-priority violation on file	SHELBYVILLE, Shelby, IN	Pass	State
2026-04-22	HALLADOR POWER COMPANY LLC MEROM GENERATING STATION — high-priority violation on file	SULLIVAN, Sullivan, IN	Pass	State
2026-04-22	HALLADOR POWER COMPANY LLC MEROM GENERATING STATION — high-priority violation on file	SULLIVAN, Sullivan, IN	Pass	State
2026-04-21	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State
2026-04-21	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State
2026-04-21	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State
2026-04-21	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State
2026-04-21	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State
2026-04-21	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State
2026-04-21	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State
2026-04-21	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State
2026-04-21	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-21	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-21	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-21	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-21	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-21	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-21	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-21	FCA US LLC KOKOMO TRANSMISSION PLANT	KOKOMO, Howard, IN	Pass	State
2026-04-21	NORTH VERNON INDUSTRY CORPORATION	NORTH VERNON, Jennings, IN	Pass	State
2026-04-21	NORTH VERNON INDUSTRY CORPORATION	NORTH VERNON, Jennings, IN	Pass	State
2026-04-21	KNAUF INSULATION INCORPORATED — high-priority violation on file	SHELBYVILLE, Shelby, IN	Pass	State
2026-04-21	KNAUF INSULATION INCORPORATED — high-priority violation on file	SHELBYVILLE, Shelby, IN	Pass	State
2026-04-21	KNAUF INSULATION INCORPORATED — high-priority violation on file	SHELBYVILLE, Shelby, IN	Pass	State
2026-04-21	KNAUF INSULATION INCORPORATED — high-priority violation on file	SHELBYVILLE, Shelby, IN	Pass	State
2026-04-21	KNAUF INSULATION INCORPORATED — high-priority violation on file	SHELBYVILLE, Shelby, IN	Pass	State
2026-04-21	METZGER CONSTRUCTION COMPANY INCORPORATED	BOONVILLE, Warrick, IN	Pass	State
2026-04-21	METZGER CONSTRUCTION COMPANY INCORPORATED	BOONVILLE, Warrick, IN	Pass	State
2026-04-21	METZGER CONSTRUCTION COMPANY INCORPORATED	BOONVILLE, Warrick, IN	Pass	State
2026-04-21	METZGER CONSTRUCTION COMPANY INCORPORATED	BOONVILLE, Warrick, IN	Pass	State
2026-04-20	THE ANDERSONS RENEWABLES LLC — high-priority violation on file	LOGANSPORT, Cass, IN	Pass	State
2026-04-20	THE ANDERSONS RENEWABLES LLC — high-priority violation on file	LOGANSPORT, Cass, IN	Pass	State
2026-04-20	THE ANDERSONS RENEWABLES LLC — high-priority violation on file	LOGANSPORT, Cass, IN	Pass	State
2026-04-20	ATLAS FOUNDRY COMPANY INC	MARION, Grant, IN	Pass	State
2026-04-16	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-04-16	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-04-16	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-04-16	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-04-16	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-04-16	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Fail	State
2026-04-16	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-16	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-16	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-16	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-16	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-16	VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT	BLUFFTON, Wells, IN	Pass	State
2026-04-16	VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT	BLUFFTON, Wells, IN	Pass	State
2026-04-15	C & D TECHNOLOGIES INC	ATTICA, Fountain, IN	Pass	State
2026-04-15	C & D TECHNOLOGIES INC	ATTICA, Fountain, IN	Pass	State
2026-04-15	GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file	WHEATFIELD, Jasper, IN	Pass	State
2026-04-15	GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file	WHEATFIELD, Jasper, IN	Pass	State
2026-04-15	GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file	WHEATFIELD, Jasper, IN	Pass	State
2026-04-15	GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file	WHEATFIELD, Jasper, IN	Pass	State
2026-04-15	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-15	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-15	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-15	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-15	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-14	DUKE ENERGY INDIANA LLC - GIBSON GENERATING STATION	OWENSVILLE, Gibson, IN	Pass	State
2026-04-14	GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file	WHEATFIELD, Jasper, IN	Pass	State
2026-04-14	GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file	WHEATFIELD, Jasper, IN	Pass	State
2026-04-14	GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file	WHEATFIELD, Jasper, IN	Pass	State
2026-04-14	GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file	WHEATFIELD, Jasper, IN	Pass	State
2026-04-14	POLY-WOOD LLC — high-priority violation on file	SYRACUSE, Kosciusko, IN	Pass	State
2026-04-14	POLY-WOOD LLC — high-priority violation on file	SYRACUSE, Kosciusko, IN	Pass	State
2026-04-14	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-04-14	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-04-14	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-04-14	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-04-14	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-04-14	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-04-14	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-14	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-14	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-14	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-14	HOWMET CASTINGS AND SERVICES INCORPORATED	LA PORTE, LaPorte, IN	Pass	State
2026-04-14	BLACKFOOT POWER GENERATING STATION	WINSLOW, Pike, IN	Pass	State
2026-04-14	BLACKFOOT POWER GENERATING STATION	WINSLOW, Pike, IN	Pass	State
2026-04-14	BLACKFOOT POWER GENERATING STATION	WINSLOW, Pike, IN	Pass	State
2026-04-11	NUCOR STEEL — high-priority violation on file	CRAWFORDSVILLE, Montgomery, IN	Pass	State
2026-04-11	NUCOR STEEL — high-priority violation on file	CRAWFORDSVILLE, Montgomery, IN	Pass	State
2026-04-11	NUCOR STEEL — high-priority violation on file	CRAWFORDSVILLE, Montgomery, IN	Pass	State
2026-04-11	NUCOR STEEL — high-priority violation on file	CRAWFORDSVILLE, Montgomery, IN	Pass	State
2026-04-09	MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY	LEAVENWORTH, Crawford, IN	Pass	State

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