EPA Air · by county
Air-emissions sources in Marathon County, Wisconsin
- 31Facilities
Every stationary source in Marathon County, Wisconsin 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 Marathon County
Each of the 31 operating major, synthetic minor and minor sources in Marathon County, Wisconsin has a record page: every source in Marathon County, A to Z.
By emissions classification in Marathon 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 Marathon 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 43
- 2025 inspections 59
- 2024 inspections 35
- 2023 inspections 24
- 2022 inspections 21
- 2021 inspections 16
- 2020 inspections 16
- 2019 inspections 9
- 2018 inspections 19
- 2017 inspections 10
Violations in Marathon 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 16
- 2025 violations 41
- 2024 violations 76
- 2023 violations 33
- 2022 violations 19
- 2021 violations 11
- 2020 violations 13
- 2019 violations 8
- 2018 violations 12
- 2017 violations 8
Stack tests in Marathon County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
- 2026 stack tests 12
- 2025 stack tests 22
- 2024 stack tests 22
- 2023 stack tests 21
- 2022 stack tests 21
- 2021 stack tests 25
- 2020 stack tests 13
- 2019 stack tests 12
- 2018 stack tests 14
- 2017 stack tests 12
Inspections in Marathon County, year by year · Violations in Marathon County, year by year · Stack tests in Marathon County, year by year
Other counties in Wisconsin
Every county in the state with at least three sources on file.
- Grant County 9
- Green County 8
- Jackson County 7
- Jefferson County 18
- Juneau County 7
- Kenosha County 16
- Kewaunee County 8
- La Crosse County 30
- Lincoln County 7
- Manitowoc County 20
- Marinette County 12
- Menominee County 16
- Milwaukee County 50
- Monroe County 46
- Oconto County 14
- Oneida County 6
- Outagamie County 6
- Ozaukee County 21
- Pepin County 3
Facilities
County as filed on the facility record. Figures from EPA’s ICIS-AIR download.