EPA Air · by county
Air-emissions sources in Middlesex County, Connecticut
- 120Facilities
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Every stationary source in Middlesex County, Connecticut 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 Middlesex County
Each of the 119 operating major, synthetic minor and minor sources in Middlesex County, Connecticut has a record page: every source in Middlesex County, A to Z.
By emissions classification in Middlesex 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 Middlesex 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.
- 2025 inspections 4
- 2023 inspections 3
- 2021 inspections 4
- 2020 inspections 4
- 2019 inspections 5
- 2018 inspections 3
- 2017 inspections 10
Violations in Middlesex 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.
Stack tests in Middlesex County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
- 2026 stack tests 9
- 2025 stack tests 18
- 2024 stack tests 12
- 2023 stack tests 10
- 2022 stack tests 12
- 2021 stack tests 16
- 2020 stack tests 3
- 2019 stack tests 9
- 2018 stack tests 5
- 2017 stack tests 6
Inspections in Middlesex County, year by year · Violations in Middlesex County, year by year · Stack tests in Middlesex County, year by year
Other counties in Connecticut
Every county in the state with at least three sources on file.
- Fairfield County 623
- Hartford County 762
- Litchfield County 156
- New Haven County 702
- New London County 161
- Tolland County 50
- Undetermined County 26
- Windham County 103
Facilities
County as filed on the facility record. Figures from EPA’s ICIS-AIR download.