EPA Air · by county
Air-emissions sources in Worcester County, Massachusetts
- 696Facilities
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Every stationary source in Worcester County, Massachusetts 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 Worcester County
Each of the 560 operating major, synthetic minor and minor sources in Worcester County, Massachusetts has a record page: every source in Worcester County, A to Z.
By emissions classification in Worcester 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 Worcester 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 67
- 2025 inspections 132
- 2024 inspections 120
- 2023 inspections 94
- 2022 inspections 105
- 2021 inspections 94
- 2020 inspections 104
- 2019 inspections 168
- 2018 inspections 196
- 2017 inspections 146
Violations in Worcester 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 4
- 2025 violations 8
- 2024 violations 12
- 2023 violations 10
- 2022 violations 8
- 2021 violations 3
- 2019 violations 3
- 2018 violations 8
- 2017 violations 6
Stack tests in Worcester County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
- 2026 stack tests 8
- 2025 stack tests 10
- 2024 stack tests 7
- 2023 stack tests 4
- 2021 stack tests 4
- 2019 stack tests 15
- 2018 stack tests 10
- 2017 stack tests 15
Inspections in Worcester County, year by year · Violations in Worcester County, year by year · Stack tests in Worcester County, year by year
Other counties in Massachusetts
Every county in the state with at least three sources on file.
- Barnstable County 95
- Berkshire County 104
- Bristol County 484
- Dukes County 7
- Essex County 376
- Franklin County 66
- Hampden County 432
- Hampshire County 93
- Middlesex County 932
- Nantucket County 9
- Norfolk County 365
- Plymouth County 256
- Suffolk County 412
- Undetermined County 7
Worcester County carries 696 of the 4,334 air-emissions sources this register holds in Massachusetts, which places it 2nd of 15 in that cohort.
Facilities
County as filed on the facility record. Figures from EPA’s ICIS-AIR download.