EPA Air · stack tests by county and year

Air-emissions stack tests in Glacier County, Montana, 2026

• 6Stack 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 Glacier County, Montana during 2026. 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 Glacier County facility page.

Air-emissions stack tests in Glacier County, other years

• 2025 22
• 2024 14
• 2023 11
• 2022 12
• 2021 20
• 2020 12
• 2019 12
• 2018 13
• 2017 26

Air-emissions stack tests recorded in Glacier County, Montana, 2026

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