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
2020-12-31	WILLISTON BASIN - CABIN CREEK	BAKER, Fallon, MT	Pass	State
2020-12-31	WILLISTON BASIN - CABIN CREEK	BAKER, Fallon, MT	Pass	State
2020-12-31	WILLISTON BASIN - CABIN CREEK	BAKER, Fallon, MT	Pass	State
2020-12-31	WILLISTON BASIN - FORT PECK STATION	NASHUA, Valley, MT	Pass	State
2020-12-18	PAR MONTANA BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-12-16	MDU - LEWIS & CLARK STATION	SIDNEY, Richland, MT	Pass	State
2020-12-14	WILLISTON BASIN - FORT PECK STATION	NASHUA, Valley, MT	Pass	State
2020-12-14	WILLISTON BASIN - FORT PECK STATION	NASHUA, Valley, MT	Pass	State
2020-11-16	WILLISTON BASIN - HATHAWAY STATION	HATHAWAY, Rosebud, MT	Pass	State
2020-11-16	WILLISTON BASIN - HATHAWAY STATION	HATHAWAY, Rosebud, MT	Pass	State
2020-11-13	WILLISTON BASIN - SACO	SACO, Phillips, MT	Pass	State
2020-11-13	WILLISTON BASIN - SACO	SACO, Phillips, MT	Pass	State
2020-11-13	WILLISTON BASIN - SACO	SACO, Phillips, MT	Pass	State
2020-11-13	WILLISTON BASIN - SACO	SACO, Phillips, MT	Pass	State
2020-11-09	WEYERHAEUSER-CFALLS — high-priority violation on file	COLUMBIA FALLS, Flathead, MT	Pass	State
2020-11-09	WEYERHAEUSER-CFALLS — high-priority violation on file	COLUMBIA FALLS, Flathead, MT	Pass	State
2020-11-09	WEYERHAEUSER-CFALLS — high-priority violation on file	COLUMBIA FALLS, Flathead, MT	Pass	State
2020-11-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-11-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-11-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-11-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-11-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-11-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-11-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-10-27	BASIN ELECTRIC POWER COOPERATIVE	BAINVILLE, Roosevelt, MT	Pass	State
2020-10-23	MDU - LEWIS & CLARK STATION	SIDNEY, Richland, MT	Pass	State
2020-10-13	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-10-12	ASH GROVE CEMENT	CLANCY, Jefferson, MT	Pass	State
2020-10-02	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-10-02	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-09-30	WEYERHAEUSER-CFALLS — high-priority violation on file	COLUMBIA FALLS, Flathead, MT	Pass	State
2020-09-30	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Fail	State
2020-09-30	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Fail	State
2020-09-30	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-09-30	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-09-30	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-09-30	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-09-29	ROCKY MOUNTAIN POWER	HARDIN, Big Horn, MT	Pass	State
2020-09-29	ROCKY MOUNTAIN POWER	HARDIN, Big Horn, MT	Pass	State
2020-09-29	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-09-23	ROCKY MOUNTAIN LABORATORIES FACILITY	HAMILTON, Ravalli, MT	Pass	State
2020-09-17	BAKKEN GATHERING PLANT	SIDNEY, Richland, MT	Pass	State
2020-09-17	BAKKEN GATHERING PLANT	SIDNEY, Richland, MT	Pass	State
2020-09-17	BAKKEN GATHERING PLANT	SIDNEY, Richland, MT	Pass	State
2020-09-17	BAKKEN GATHERING PLANT	SIDNEY, Richland, MT	Pass	State
2020-09-11	WEYERHAEUSER-EVERGREEN — high-priority violation on file	KALISPELL, Flathead, MT	Pass	State
2020-09-08	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-09-08	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-09-08	COLSTRIP STEAM ELECTRIC STATION	COLSTRIP, Rosebud, MT	Pass	State
2020-08-28	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-08-28	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-08-28	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-08-28	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-08-28	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Fail	State
2020-08-28	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-08-28	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-08-27	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-08-27	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-08-27	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-08-27	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-08-27	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-08-18	BILLINGS REFINERY	BILLINGS, Yellowstone, MT	Pass	State
2020-08-17	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-08-17	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-08-17	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-08-17	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-08-17	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-08-17	NORTHWESTERN ENERGY MAINLINE #1	CUT BANK, Glacier, MT	Pass	State
2020-08-14	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-08-14	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-08-14	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-08-14	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-08-14	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-08-14	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-08-14	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-08-14	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-08-14	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-08-14	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-08-14	CALUMET MONTANA REFINING — high-priority violation on file	GREAT FALLS, Cascade, MT	Pass	State
2020-08-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-08-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-08-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-08-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-08-04	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-07-29	MDU - LEWIS & CLARK STATION	SIDNEY, Richland, MT	Pass	State
2020-07-29	MDU - LEWIS & CLARK STATION	SIDNEY, Richland, MT	Pass	State
2020-07-29	MDU - LEWIS & CLARK STATION	SIDNEY, Richland, MT	Pass	State
2020-07-29	MDU - LEWIS & CLARK STATION	SIDNEY, Richland, MT	Pass	State
2020-07-28	TRIDENT	THREE FORKS, Gallatin, MT	Pass	State
2020-07-28	TRIDENT	THREE FORKS, Gallatin, MT	Pass	State
2020-07-27	GRAYMONT WESTERN US INC	TOWNSEND, Broadwater, MT	Pass	State
2020-07-27	GRAYMONT WESTERN US INC	TOWNSEND, Broadwater, MT	Pass	State
2020-07-20	YELLOWSTONE POWER PLANT — high-priority violation on file	BILLINGS, Yellowstone, MT	Pass	State
2020-07-15	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-07-15	CHS INC REFINERY LAUREL	LAUREL, Yellowstone, MT	Pass	State
2020-07-14	TRIDENT	THREE FORKS, Gallatin, MT	Pass	State
2020-07-14	TRIDENT	THREE FORKS, Gallatin, MT	Pass	State
2020-07-10	WILLISTON BASIN - HATHAWAY STATION	HATHAWAY, Rosebud, MT	Pass	State
2020-07-10	WILLISTON BASIN - HATHAWAY STATION	HATHAWAY, Rosebud, MT	Pass	State
2020-07-10	WILLISTON BASIN - CABIN CREEK	BAKER, Fallon, MT	Pass	State

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