EPA Air · by county
Air-emissions sources in Ada County, Idaho
- 299Facilities
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Every stationary source in Ada County, Idaho that holds a Clean Air Act permit or is otherwise tracked by an air agency — planned, under construction, operating, seasonal or temporarily closed. Sources EPA records as permanently closed are not listed.
Every source’s record in Ada County
Each of the 293 operating major, synthetic minor and minor sources in Ada County, Idaho has a record page: every source in Ada County, A to Z.
By emissions classification in Ada County
A source’s classification is the size band its potential emissions put it in: a major source is large enough to need a Title V operating permit, a synthetic minor has accepted limits to stay below that line, and a minor source sits below it outright.
Inspections in Ada County, by year
A compliance evaluation is the on-site or file review a state, local or federal air agency records against a permitted source.
- 2026 inspections 34
- 2025 inspections 44
- 2024 inspections 44
- 2023 inspections 24
- 2022 inspections 32
- 2021 inspections 49
- 2020 inspections 30
- 2019 inspections 27
- 2018 inspections 19
- 2017 inspections 9
Stack tests in Ada County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
- 2026 stack tests 20
- 2025 stack tests 41
- 2024 stack tests 8
- 2023 stack tests 5
- 2022 stack tests 7
- 2021 stack tests 13
- 2020 stack tests 21
- 2019 stack tests 22
- 2018 stack tests 10
Inspections in Ada County, year by year · Stack tests in Ada County, year by year
Other counties in Idaho
Every county in the state with at least three sources on file.
- Adams County 3
- Bannock County 39
- Bear Lake County 5
- Benewah County 9
- Bingham County 39
- Blaine County 11
- Bonner County 28
- Bonneville County 72
- Boundary County 13
- Canyon County 126
- Caribou County 21
- Cassia County 35
- Clearwater County 6
- Custer County 3
- Elmore County 21
- Franklin County 12
- Fremont County 10
- Gem County 7
- Gooding County 14
Facilities
County as filed on the facility record. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register for Ada county, ID. It lists 299 facilities in Ada county and 3 major sources.