EPA Air · stack tests by county and year

Air-emissions stack tests in Rosebud County, Montana, 2020

27Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Rosebud County, Montana during 2020. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Rosebud County facility page.

Air-emissions stack tests in Rosebud County, other years

Air-emissions stack tests recorded in Rosebud County, Montana, 2020

Date	Facility	Kind	Agency
2020-11-16	WILLISTON BASIN - HATHAWAY STATION	Pass	State
2020-11-16	WILLISTON BASIN - HATHAWAY STATION	Pass	State
2020-10-02	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-10-02	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-09-08	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-09-08	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-09-08	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-07-10	WILLISTON BASIN - HATHAWAY STATION	Pass	State
2020-07-10	WILLISTON BASIN - HATHAWAY STATION	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-04-24	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-03-20	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-03-20	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-03-19	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-03-19	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-01-29	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-01-29	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-01-29	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-01-29	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-01-02	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-01-02	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-01-02	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2020-01-02	COLSTRIP STEAM ELECTRIC STATION	Pass	State

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