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
2020-07-07	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-07-07	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-06-26	ASH GROVE CEMENT	CLANCY, Jefferson, MT	Pass	State
2020-06-26	ASH GROVE CEMENT	CLANCY, Jefferson, MT	Pass	State
2020-06-26	ASH GROVE CEMENT	CLANCY, Jefferson, MT	Pass	State
2020-06-26	ASH GROVE CEMENT	CLANCY, Jefferson, MT	Pass	State
2020-06-26	PAR MONTANA BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-06-25	PAR MONTANA BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-06-25	PAR MONTANA BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-06-17	PAR MONTANA BULK TERMINAL	BILLINGS, Yellowstone, MT	Pass	State
2020-06-16	DRY CREEK FIELD STATION 056	RED LODGE, Carbon, MT	Pass	State
2020-06-16	DRY CREEK FIELD STATION 056	RED LODGE, Carbon, MT	Pass	State
2020-06-05	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-06-05	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-06-05	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-06-05	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-06-05	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-06-05	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-06-05	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-06-05	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-06-01	WILLISTON BASIN - FORT PECK STATION	NASHUA, Valley, MT	Pass	State
2020-06-01	WILLISTON BASIN - FORT PECK STATION	NASHUA, Valley, MT	Pass	State
2020-06-01	WILLISTON BASIN - FORT PECK STATION	NASHUA, Valley, MT	Pass	State
2020-06-01	WILLISTON BASIN - SACO	SACO, Phillips, MT	Pass	State
2020-06-01	WILLISTON BASIN - SACO	SACO, Phillips, MT	Pass	State
2020-06-01	WILLISTON BASIN - SACO	SACO, Phillips, MT	Pass	State
2020-06-01	WILLISTON BASIN - SACO	SACO, Phillips, MT	Pass	State
2020-05-15	BAINVILLE STATION	BAINVILLE, Roosevelt, MT	Pass	State
2020-05-15	BAINVILLE STATION	BAINVILLE, Roosevelt, MT	Pass	State
2020-05-01	STILLWATER MINING CO SMELTER	COLUMBUS, Stillwater, MT	Pass	State
2020-05-01	STILLWATER MINING CO SMELTER	COLUMBUS, Stillwater, MT	Pass	State
2020-05-01	STILLWATER MINING CO SMELTER	COLUMBUS, Stillwater, MT	Pass	State
2020-04-30	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-04-29	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-04-29	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-04-29	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-04-29	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-04-29	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-04-29	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-04-29	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-04-21	MDU - LEWIS & CLARK STATION	SIDNEY, Richland, MT	Pass	State
2020-04-21	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-04-21	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-04-21	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-04-07	MSU - CENTRAL HEATING PLANT	BOZEMAN, Gallatin, MT	Pass	State
2020-04-03	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-04-01	WILLISTON BASIN - BAKER COMPRESSOR STA	BAKER, Fallon, MT	Pass	State
2020-04-01	WBI SANDSTONE CREEK COMPRESSOR STATION	BAKER, Fallon, MT	Pass	State
2020-04-01	WBI SANDSTONE CREEK COMPRESSOR STATION	BAKER, Fallon, MT	Pass	State
2020-04-01	WBI SANDSTONE CREEK COMPRESSOR STATION	BAKER, Fallon, MT	Pass	State
2020-04-01	WBI SANDSTONE CREEK COMPRESSOR STATION	BAKER, Fallon, MT	Pass	State
2020-04-01	WBI SANDSTONE CREEK COMPRESSOR STATION	BAKER, Fallon, MT	Pass	State
2020-03-20	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-03-20	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-03-19	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-03-19	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-03-16	WILLISTON BASIN - LITTLE BEAVER	BAKER, Fallon, MT	Pass	State
2020-03-16	WILLISTON BASIN - CABIN CREEK	BAKER, Fallon, MT	Pass	State
2020-03-16	WILLISTON BASIN - CABIN CREEK	BAKER, Fallon, MT	Pass	State
2020-03-16	WILLISTON BASIN - CABIN CREEK	BAKER, Fallon, MT	Pass	State
2020-02-26	WILLISTON BASIN - CABIN CREEK	BAKER, Fallon, MT	Pass	State
2020-02-26	WILLISTON BASIN - CABIN CREEK	BAKER, Fallon, MT	Pass	State
2020-02-26	WBI SANDSTONE CREEK COMPRESSOR STATION	BAKER, Fallon, MT	Pass	State
2020-02-21	MDU - LEWIS & CLARK STATION	SIDNEY, Richland, MT	Pass	State
2020-02-19	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-02-19	BASIN CREEK POWER SERVICES	BUTTE, Silver Bow, MT	Pass	State
2020-02-19	BASIN CREEK POWER SERVICES	BUTTE, Silver Bow, MT	Pass	State
2020-02-19	BASIN CREEK POWER SERVICES	BUTTE, Silver Bow, MT	Pass	State
2020-02-19	BASIN CREEK POWER SERVICES	BUTTE, Silver Bow, MT	Pass	State
2020-02-19	BASIN CREEK POWER SERVICES	BUTTE, Silver Bow, MT	Pass	State
2020-02-19	BASIN CREEK POWER SERVICES	BUTTE, Silver Bow, MT	Pass	State
2020-02-19	BASIN CREEK POWER SERVICES	BUTTE, Silver Bow, MT	Pass	State
2020-02-19	BASIN CREEK POWER SERVICES	BUTTE, Silver Bow, MT	Pass	State
2020-02-19	BASIN CREEK POWER SERVICES	BUTTE, Silver Bow, MT	Pass	State
2020-02-19	BASIN CREEK POWER SERVICES	BUTTE, Silver Bow, MT	Pass	State
2020-02-14	DRY CREEK FIELD STATION 056	RED LODGE, Carbon, MT	Pass	State
2020-02-14	DRY CREEK FIELD STATION 056	RED LODGE, Carbon, MT	Pass	State
2020-02-14	DRY CREEK FIELD STATION 056	RED LODGE, Carbon, MT	Pass	State
2020-02-06	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-02-06	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-02-06	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-02-06	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-02-06	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-01-29	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-01-29	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-01-29	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-01-29	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-01-29	PAR MONTANA BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-01-27	PAR MONTANA BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-01-20	WESTERN SUGAR COOPERATIVE — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-01-20	WESTERN SUGAR COOPERATIVE — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-01-15	WEYERHAEUSER-CFALLS — high-priority violation on file	COLUMBIA FALLS, Flathead, MT	Pass	State
2020-01-15	WEYERHAEUSER-CFALLS — high-priority violation on file	COLUMBIA FALLS, Flathead, MT	Pass	State
2020-01-14	MONTANA SULPHUR & CHEMICAL	BILLINGS, Yellowstone, MT	Pass	State

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