EPA Air · by county
Air-emissions sources in Frederick County, Maryland
- 383Facilities
Every stationary source in Frederick County, Maryland 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 Frederick County
Each of the 380 operating major, synthetic minor and minor sources in Frederick County, Maryland has a record page: every source in Frederick County, A to Z.
By emissions classification in Frederick 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 Frederick 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 3
- 2025 inspections 11
- 2024 inspections 31
- 2023 inspections 36
- 2022 inspections 26
- 2021 inspections 26
- 2020 inspections 19
- 2019 inspections 25
- 2018 inspections 33
- 2017 inspections 43
Violations in Frederick 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 Frederick County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
Inspections in Frederick County, year by year · Violations in Frederick County, year by year · Stack tests in Frederick County, year by year
Other counties in Maryland
Every county in the state with at least three sources on file.
- Allegany County 126
- Anne Arundel County 672
- Baltimore County 1,116
- Baltimore (city) County 1,788
- Calvert County 70
- Caroline County 44
- Carroll County 224
- Cecil County 142
- Charles County 134
- Dorchester County 85
- Garrett County 79
- Harford County 317
- Howard County 234
- Kent County 47
- Montgomery County 1,332
- Prince George's County 1,450
- Queen Anne's County 45
- Somerset County 58
- St. Mary's County 43
Facilities
County as filed on the facility record. Figures from EPA’s ICIS-AIR download.