EPA Air · by county
Air-emissions sources in Marion County, Indiana
- 159Facilities
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Every stationary source in Marion County, Indiana 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 Marion County
Each of the 159 operating major, synthetic minor and minor sources in Marion County, Indiana has a record page: every source in Marion County, A to Z.
By emissions classification in Marion 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 Marion 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 29
- 2025 inspections 24
- 2024 inspections 45
- 2023 inspections 23
- 2022 inspections 23
- 2021 inspections 29
- 2020 inspections 26
- 2019 inspections 43
- 2018 inspections 24
- 2017 inspections 30
Violations in Marion County, by year
A high-priority violation is the most serious class of Clean Air Act non-compliance an agency records against a source; a federally reportable violation is the next step down in severity.
- 2026 violations 9
- 2025 violations 22
- 2024 violations 35
- 2023 violations 31
- 2022 violations 23
- 2021 violations 34
- 2020 violations 12
- 2019 violations 27
- 2018 violations 19
- 2017 violations 7
Stack tests in Marion County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
- 2026 stack tests 54
- 2025 stack tests 97
- 2024 stack tests 94
- 2023 stack tests 113
- 2022 stack tests 81
- 2021 stack tests 59
- 2020 stack tests 98
- 2019 stack tests 200
- 2018 stack tests 77
- 2017 stack tests 120
Inspections in Marion County, year by year · Violations in Marion County, year by year · Stack tests in Marion County, year by year
Other counties in Indiana
Every county in the state with at least three sources on file.
- Jefferson County 7
- Jennings County 8
- Johnson County 21
- Knox County 16
- Kosciusko County 30
- LaGrange County 27
- Lake County 128
- LaPorte County 31
- Lawrence County 8
- Madison County 17
- Marshall County 37
- Martin County 4
- Miami County 12
- Monroe County 12
- Montgomery County 12
- Morgan County 13
- Newton County 4
- Noble County 16
- Orange County 7
Facilities
County as filed on the facility record. Figures from EPA’s ICIS-AIR download.
What this page shows
The page covers Clean Air Act facilities in the EPA air register for Marion county, IN. It lists 159 facilities in Marion county. It lists 31 major sources.