EPA Air · stack tests by state and year

Air-emissions stack tests in Montana, 2020

217Stack 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 Montana during 2020; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Counties in Montana, 2020

Montana, other years

Air-emissions stack tests recorded in Montana, 2020

Date	Facility	Where	Kind	Agency
2020-01-12	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-01-10	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-01-08	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-01-08	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-01-08	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-01-08	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-01-08	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-01-06	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-01-03	WILLISTON BASIN - CABIN CREEK	BAKER, Fallon, MT	Pass	State
2020-01-03	WBI SANDSTONE CREEK COMPRESSOR STATION	BAKER, Fallon, MT	Pass	State
2020-01-03	WBI SANDSTONE CREEK COMPRESSOR STATION	BAKER, Fallon, MT	Pass	State
2020-01-02	WILLISTON BASIN - MONARCH STATION	BAKER, Fallon, MT	Pass	State
2020-01-02	TRIDENT	THREE FORKS, Gallatin, MT	Pass	State
2020-01-02	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-01-02	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-01-02	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-01-02	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State

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