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
2026-01-08	ROCKIES EXPRESS PIPELINE LLC - ST PAUL COMPRESSOR STATION	SAINT PAUL, Decatur, IN	Pass	State
2026-01-08	ROCKIES EXPRESS PIPELINE LLC - ST PAUL COMPRESSOR STATION	SAINT PAUL, Decatur, IN	Pass	State
2026-01-08	NORTHEASTERN REMC — high-priority violation on file	COLUMBIA CITY, Whitley, IN	Pass	State
2026-01-08	NORTHEASTERN REMC — high-priority violation on file	COLUMBIA CITY, Whitley, IN	Pass	State
2026-01-08	NORTHEASTERN REMC — high-priority violation on file	COLUMBIA CITY, Whitley, IN	Pass	State
2026-01-08	NORTHEASTERN REMC — high-priority violation on file	COLUMBIA CITY, Whitley, IN	Pass	State
2026-01-08	NORTHEASTERN REMC — high-priority violation on file	COLUMBIA CITY, Whitley, IN	Pass	State
2026-01-08	NORTHEASTERN REMC — high-priority violation on file	COLUMBIA CITY, Whitley, IN	Pass	State
2026-01-06	ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file	NEWBURGH, Warrick, IN	Pass	State
2026-01-06	STEEL DYNAMICS, INC. STRUCTURAL & RAIL DIVISION — high-priority violation on file	COLUMBIA CITY, Whitley, IN	Pass	State

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