EPA Air · stack tests by county and year

Air-emissions stack tests in Rosebud County, Montana, 2023

24Stack 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 2023. 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, 2023

Date	Facility	Kind	Agency
2023-12-26	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-12-26	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-12-21	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-12-15	COLSTRIP ENERGY LTD PARTNERSHIP	Pass	State
2023-12-15	COLSTRIP ENERGY LTD PARTNERSHIP	Pass	State
2023-12-15	COLSTRIP ENERGY LTD PARTNERSHIP	Pass	State
2023-12-15	COLSTRIP ENERGY LTD PARTNERSHIP	Pass	State
2023-10-31	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-10-31	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-10-18	WILLISTON BASIN - HATHAWAY STATION	Pass	State
2023-07-06	WILLISTON BASIN - HATHAWAY STATION	Pass	State
2023-05-03	WILLISTON BASIN - HATHAWAY STATION	Pass	State
2023-04-21	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-04-21	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-03-28	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-03-28	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-03-28	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-03-28	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-03-28	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-03-17	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-03-17	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-01-23	COLSTRIP ENERGY LTD PARTNERSHIP	Pass	State
2023-01-06	COLSTRIP STEAM ELECTRIC STATION	Pass	State
2023-01-06	COLSTRIP STEAM ELECTRIC STATION	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 Rosebud county, MT, in 2023. It lists 24 stack tests recorded in 2023.