EPA Air · by county
Air-emissions sources in Knox County, Maine
- 22Facilities
0 changes to this record in 90 days; alerts $99/month.
Start the watch
- One source — $99/month
- One county — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
Every stationary source in Knox County, Maine 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 Knox County
Each of the 17 operating major, synthetic minor and minor sources in Knox County, Maine has a record page: every source in Knox County, A to Z.
By emissions classification in Knox 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 Knox 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 12
- 2025 inspections 24
- 2024 inspections 23
- 2023 inspections 22
- 2022 inspections 25
- 2021 inspections 32
- 2020 inspections 19
- 2019 inspections 23
- 2018 inspections 13
- 2017 inspections 9
Stack tests in Knox County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
- 2023 stack tests 4
- 2022 stack tests 4
- 2021 stack tests 6
- 2020 stack tests 11
- 2019 stack tests 7
- 2018 stack tests 5
- 2017 stack tests 11
Inspections in Knox County, year by year · Stack tests in Knox County, year by year
Other counties in Maine
Every county in the state with at least three sources on file.
- Androscoggin County 64
- Aroostook County 57
- Cumberland County 166
- Franklin County 19
- Hancock County 30
- Kennebec County 64
- Lincoln County 15
- Oxford County 26
- Penobscot County 87
- Piscataquis County 15
- Sagadahoc County 17
- Somerset County 27
- Waldo County 24
- Washington County 20
- York County 102
Facilities
| Facility↑↓ | Classification↑↓ | HPV |
|---|---|---|
| DANISCO USA INC. | Major source | No |
| DICAPERL MINERALS CORP. | Minor source | No |
| DOUGLAS DYNAMICS, L.L.C. | Synthetic minor source | No |
| EUROVIA ATLANTIC COAST LLC | Synthetic minor source | No |
| FERRAIOLO CONSTRUCTION, INC. | Synthetic minor source | No |
| FERRAIOLO CONSTRUCTION, INC. | Synthetic minor source | No |
| FOX ISLAND ELECTRIC COOPERATIVE, INC. | Synthetic minor source | No |
| GEORGE C. HALL & SONS INC. | Minor source | No |
| HEIDELBERG MATERIALS US CEMENT LLC | Major source | Yes |
| JAKE BARBOUR, INC. | Minor source | No |
| JAKE BORBOUR, INC. | Minor source | No |
| JAKE BORBOUR, INC. | Minor source | No |
| MAINE DEPARTMENT OF CORRECTIONS, MAINE STATE PRISON | Synthetic minor source | No |
| MIDCOAST CREMATORY, INC. | Minor source | No |
| MILLS EXCAVATION, INC. | Minor source | No |
| MILLS EXCAVATION, INC. | Minor source | No |
| NORTH END COMPOSITES LLC | Major source | No |
| PARK STREET LAUNDRY AND DRYCLEANERS | Minor source | No |
| PATTERSON ASPHALT INDUSTRIES LLC | Synthetic minor source | No |
| PENOBSCOT BAY MEDICAL CENTER | Synthetic minor source | No |
| PIKE INDUSTRIES, INC. | Synthetic minor source | No |
| ROCKLAND MARINE CORPORATION | Minor source | No |
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 Knox county, ME. It lists 22 facilities in Knox county and 3 major sources.