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.

What this page shows

This page covers Clean Air Act facilities in the EPA air register with stack tests in MT in 2020. It lists 217 stack tests recorded in 2020.