EPA Air · by county
Air-emissions sources in Orange County, California
- 110Facilities
Every stationary source in Orange County, California 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 Orange County
Each of the 99 operating major, synthetic minor and minor sources in Orange County, California has a record page: every source in Orange County, A to Z.
By emissions classification in Orange 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.
- Major source 56
- Minor source 48
Inspections in Orange 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 17
- 2025 inspections 31
- 2024 inspections 62
- 2023 inspections 39
- 2022 inspections 40
- 2021 inspections 23
- 2020 inspections 53
- 2019 inspections 100
- 2018 inspections 70
- 2017 inspections 80
Stack tests in Orange County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
- 2026 stack tests 4
- 2025 stack tests 10
- 2024 stack tests 35
- 2023 stack tests 70
- 2022 stack tests 22
- 2021 stack tests 19
- 2020 stack tests 58
- 2019 stack tests 65
- 2018 stack tests 61
- 2017 stack tests 31
Inspections in Orange County, year by year · Stack tests in Orange County, year by year
Other counties in California
Every county in the state with at least three sources on file.
- Kings County 23
- Lassen County 3
- Los Angeles County 390
- Madera County 22
- Marin County 5
- Mendocino County 3
- Merced County 23
- Modoc County 4
- Monterey County 14
- Napa County 5
- Placer County 42
- Riverside County 65
- Sacramento County 97
- San Bernardino County 123
- San Diego County 126
- San Francisco County 36
- San Joaquin County 74
- San Luis Obispo County 16
- San Mateo County 34
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 Orange county, CA. It lists 110 facilities in Orange county and 56 major sources.