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
2026-05-13	MATALCO BLUFFTON LLC — high-priority violation on file	BLUFFTON, Wells, IN	Pass	State
2026-05-13	MATALCO BLUFFTON LLC — high-priority violation on file	BLUFFTON, Wells, IN	Pass	State
2026-05-13	MATALCO BLUFFTON LLC — high-priority violation on file	BLUFFTON, Wells, IN	Pass	State
2026-05-13	MATALCO BLUFFTON LLC — high-priority violation on file	BLUFFTON, Wells, IN	Pass	State
2026-05-12	GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file	ROANOKE, Huntington, IN	Pass	State
2026-05-12	GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file	ROANOKE, Huntington, IN	Pass	State
2026-05-12	GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file	ROANOKE, Huntington, IN	Pass	State
2026-05-12	GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file	ROANOKE, Huntington, IN	Pass	State
2026-05-12	GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file	ROANOKE, Huntington, IN	Pass	State
2026-05-12	GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file	ROANOKE, Huntington, IN	Pass	State
2026-05-12	GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file	ROANOKE, Huntington, IN	Pass	State
2026-05-12	GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file	ROANOKE, Huntington, IN	Pass	State
2026-05-12	GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file	ROANOKE, Huntington, IN	Pass	State
2026-05-12	MAC CONSTRUCTION & EXCAVATING INC	JEFFERSONVILLE, Clark, IN	Pass	State
2026-05-12	MAC CONSTRUCTION & EXCAVATING INC	JEFFERSONVILLE, Clark, IN	Pass	State
2026-05-12	MAC CONSTRUCTION & EXCAVATING INC	JEFFERSONVILLE, Clark, IN	Pass	State
2026-05-12	MAC CONSTRUCTION & EXCAVATING INC	JEFFERSONVILLE, Clark, IN	Pass	State
2026-05-12	STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file	BUTLER, DeKalb, IN	Pass	State
2026-05-12	STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file	BUTLER, DeKalb, IN	Pass	State
2026-05-12	STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file	BUTLER, DeKalb, IN	Pass	State
2026-05-12	STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file	BUTLER, DeKalb, IN	Pass	State
2026-05-12	STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file	BUTLER, DeKalb, IN	Pass	State
2026-05-12	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-05-12	BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file	WHITING, Lake, IN	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	INDIANAPOLIS, Marion, IN	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	INDIANAPOLIS, Marion, IN	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	INDIANAPOLIS, Marion, IN	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	INDIANAPOLIS, Marion, IN	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	INDIANAPOLIS, Marion, IN	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	INDIANAPOLIS, Marion, IN	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	INDIANAPOLIS, Marion, IN	Pass	State
2026-05-12	HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA	INDIANAPOLIS, Marion, IN	Pass	State
2026-05-12	CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file	MOUNT VERNON, Posey, IN	Pass	State
2026-05-12	CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file	MOUNT VERNON, Posey, IN	Pass	State
2026-05-12	CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file	MOUNT VERNON, Posey, IN	Pass	State
2026-05-12	CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file	MOUNT VERNON, Posey, IN	Pass	State
2026-05-12	AMPACET CORPORATION	TERRE HAUTE, Vigo, IN	Pass	State
2026-05-12	AMPACET CORPORATION	TERRE HAUTE, Vigo, IN	Pass	State
2026-05-12	AMPACET CORPORATION	TERRE HAUTE, Vigo, IN	Pass	State
2026-05-12	AMPACET CORPORATION	TERRE HAUTE, Vigo, IN	Pass	State
2026-05-12	AMPACET CORPORATION	TERRE HAUTE, Vigo, IN	Pass	State
2026-05-12	AMPACET CORPORATION	TERRE HAUTE, Vigo, IN	Pass	State
2026-05-12	AMPACET CORPORATION	TERRE HAUTE, Vigo, IN	Pass	State
2026-05-12	AMPACET CORPORATION	TERRE HAUTE, Vigo, IN	Pass	State
2026-05-07	HEIDELBERG MATERIALS US CEMENT LLC	LOGANSPORT, Cass, IN	Pass	State
2026-05-07	HEIDELBERG MATERIALS US CEMENT LLC	LOGANSPORT, Cass, IN	Pass	State
2026-05-07	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-07	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-07	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-07	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-07	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-07	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-07	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-07	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-07	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-06	CITIZENS GAS JOHNSTOWN COMPRESSOR STATION	WORTHINGTON, Greene, IN	Pass	State
2026-05-06	CITIZENS GAS JOHNSTOWN COMPRESSOR STATION	WORTHINGTON, Greene, IN	Pass	State
2026-05-06	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-06	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-06	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-06	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-05	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-05	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-05	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-05	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-05	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-05	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-05	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-05	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-05	UNITED STATES GYPSUM COMPANY	EAST SHOALS, Martin, IN	Pass	State
2026-05-05	CLEVELAND-CLIFFS BURNS HARBOR LLC — high-priority violation on file	BURNS HARBOR, Porter, IN	Pass	State
2026-04-30	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-04-30	STEEL DYNAMICS, INC. STRUCTURAL & RAIL DIVISION — high-priority violation on file	COLUMBIA CITY, Whitley, IN	Pass	State
2026-04-29	STEEL DYNAMICS INCORPORATED ENGINEERED BAR PRODUCTS DIVISION — high-priority violation on file	PITTSBORO, Hendricks, IN	Pass	State
2026-04-29	STEEL DYNAMICS INCORPORATED ENGINEERED BAR PRODUCTS DIVISION — high-priority violation on file	PITTSBORO, Hendricks, IN	Pass	State
2026-04-29	STEEL DYNAMICS INCORPORATED ENGINEERED BAR PRODUCTS DIVISION — high-priority violation on file	PITTSBORO, Hendricks, IN	Pass	State
2026-04-29	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-04-28	VALTO INC	GOSHEN, Elkhart, IN	Pass	State
2026-04-28	NOVAE LLC — high-priority violation on file	MARKLE, Wells, IN	Pass	State
2026-04-28	NOVAE LLC — high-priority violation on file	MARKLE, Wells, IN	Pass	State
2026-04-28	NOVAE LLC — high-priority violation on file	MARKLE, Wells, IN	Pass	State
2026-04-28	NOVAE LLC — high-priority violation on file	MARKLE, Wells, IN	Pass	State
2026-04-28	NUCOR STEEL — high-priority violation on file	CRAWFORDSVILLE, Montgomery, IN	Pass	State
2026-04-28	NUCOR STEEL — high-priority violation on file	CRAWFORDSVILLE, Montgomery, IN	Pass	State
2026-04-28	NUCOR STEEL — high-priority violation on file	CRAWFORDSVILLE, Montgomery, IN	Pass	State
2026-04-28	NUCOR STEEL — high-priority violation on file	CRAWFORDSVILLE, Montgomery, IN	Pass	State
2026-04-24	ALLISON TRANSMISSION INC SPEEDWAY MAIN CAMPUS — high-priority violation on file	INDIANAPOLIS, Marion, IN	Fail	State
2026-04-24	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-04-24	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-04-24	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-04-23	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-04-23	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-04-23	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
2026-04-23	TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file	LAFAYETTE, Tippecanoe, IN	Pass	State
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	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State
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	THERMA TRU CORPORATION	BUTLER, DeKalb, IN	Pass	State

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