EPA Air · stack tests by county and year

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

17Stack 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 Cascade 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 Cascade County facility page.

Air-emissions stack tests in Cascade County, other years

Air-emissions stack tests recorded in Cascade County, Montana, 2023

Date	Facility	Kind	Agency
2023-12-15	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-12-15	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-12-15	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-12-15	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-12-15	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-12-15	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-05-10	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-05-10	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-02-13	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-02-13	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-02-13	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-02-13	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-02-13	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-02-13	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State
2023-01-27	MALMSTROM AFB	Pass	State
2023-01-27	MALMSTROM AFB	Pass	State
2023-01-13	CALUMET MONTANA REFINING — high-priority violation on file	Pass	State

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