EPA Air · stack tests by state and year
Air-emissions stack tests in Maryland, 2025
- 51Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Maryland during 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Maryland, 2025
- Baltimore (city) County 7
- Montgomery County 6
- Baltimore County 5
- Anne Arundel County 5
- Howard County 4
- Harford County 4
- Prince George's County 3
Maryland, other years
Air-emissions stack tests recorded in Maryland, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-23 | MONTGOMERY COUNTY RRF — high-priority violation on file | DICKERSON, Montgomery, MD | Fail | State |
| 2025-12-18 | DOMINION ENERGY COVE POINT LNG, LP | LUSBY, Calvert, MD | Pass | State |
| 2025-12-16 | CURTIS BAY ENERGY, LP — high-priority violation on file | BALTIMORE, Baltimore (city), MD | Pass | State |
| 2025-12-10 | VICINITY ENERGY BALTIMORE HEATING, LLP - SPRING GARDENS | BALTIMORE, Baltimore (city), MD | Pass | State |
| 2025-12-08 | GSA FEDERAL RESEARCH CENTER AT WHITE OAK | SILVER SPRING, Montgomery, MD | Pass | State |
| 2025-12-08 | EASTON UTILITIES - AIRPORT PARK | EASTON, Talbot, MD | Pass | State |
| 2025-12-04 | EASTON UTILITIES - WASHINGTON STREET | EASTON, Talbot, MD | Pass | State |
| 2025-12-02 | UNIVERSITY OF MARYLAND MEDICAL CENTER | BALTIMORE, Baltimore (city), MD | Pass | State |
| 2025-11-19 | CONSTELLATION POWER - PERRYMAN POWER PLANT | ABERDEEN, Harford, MD | Pass | State |
| 2025-11-18 | MILLERSVILLE LANDFILL GAS TO ELECTRICITY FACILITY | SEVERN, Anne Arundel, MD | Pass | State |
| 2025-11-05 | SCHMIDT BAKING | NOTTINGHAM, Baltimore, MD | Pass | State |
| 2025-11-05 | TRANSCONTINENTAL GAS PIPELINE | ELLICOTT CITY, Howard, MD | Pass | State |
| 2025-10-23 | EASTERN SANITARY LANDFILL | WHITE MARSH, Baltimore, MD | Pass | State |
| 2025-10-21 | MILLERSVILLE LANDFILL | SEVERN, Anne Arundel, MD | Pass | State |
| 2025-10-21 | DOMINION TRANSMISSION, INC | MIDDLETOWN, Frederick, MD | Pass | State |
| 2025-09-25 | MONTGOMERY COUNTY RRF — high-priority violation on file | DICKERSON, Montgomery, MD | Fail | State |
| 2025-09-25 | MONTGOMERY COUNTY RRF — high-priority violation on file | DICKERSON, Montgomery, MD | Pass | State |
| 2025-09-24 | AMRIZE — high-priority violation on file | HAGERSTOWN, Washington, MD | Pass | State |
| 2025-09-12 | CPV MARYLAND, LLC - ST. CHARLES PROJECT | WALDORF, Charles, MD | Pass | State |
| 2025-09-11 | CONSTELLATION POWER - PERRYMAN POWER PLANT | ABERDEEN, Harford, MD | Pass | State |
| 2025-09-09 | METTIKI COAL, LLC | OAKLAND, Garrett, MD | Pass | State |
| 2025-08-25 | AMRIZE - SPARROWS POINT FACILITY | SPARROWS POINT, Baltimore, MD | Pass | State |
| 2025-08-12 | ALPHA RIDGE LANDFILL | MARRIOTTSVILLE, Howard, MD | Pass | State |
| 2025-08-05 | TRANSCONTINENTAL GAS PIPELINE | ELLICOTT CITY, Howard, MD | Pass | State |
| 2025-07-24 | CENTER POINT TERMINAL COMPANY, LLC | SALISBURY, Wicomico, MD | Pass | State |
| 2025-07-23 | RAVEN POWER FORT SMALLWOOD LLC | CURTIS BAY, Anne Arundel, MD | Pass | State |
| 2025-07-17 | RAVEN POWER FORT SMALLWOOD LLC | CURTIS BAY, Anne Arundel, MD | Pass | State |
| 2025-07-10 | WHEELABRATOR BALTIMORE, LP | BALTIMORE, Baltimore (city), MD | Pass | State |
| 2025-07-09 | WILDCAT POINT GENERATION FACILITY | CONOWINGO, Cecil, MD | Pass | State |
| 2025-06-26 | SCHMIDT BAKING | NOTTINGHAM, Baltimore, MD | Pass | State |
| 2025-06-25 | SCHMIDT BAKING | NOTTINGHAM, Baltimore, MD | Pass | State |
| 2025-06-11 | NAVAL SUPPORT FACILITY, INDIAN HEAD — high-priority violation on file | INDIAN HEAD, Charles, MD | Pass | State |
| 2025-06-10 | HARFORD WASTE DISPOSAL CENTER | STREET, Harford, MD | Pass | State |
| 2025-06-06 | CURTIS BAY ENERGY, LP — high-priority violation on file | BALTIMORE, Baltimore (city), MD | Fail | State |
| 2025-05-29 | UPPER CHESAPEAKE MEDICAL CENTER | BEL AIR, Harford, MD | Pass | State |
| 2025-05-13 | TEXAS EASTERN TRANSMISSION | ACCIDENT, Garrett, MD | Pass | State |
| 2025-05-08 | UNION HOSPITAL | ELKTON, Cecil, MD | Pass | State |
| 2025-05-07 | FORT GEORGE G. MEADE, DEPT. OF THE ARMY | FORT GEORGE G. MEADE, Anne Arundel, MD | Pass | State |
| 2025-04-30 | LEHIGH CEMENT COMPANY - UNION BRIDGE | UNION BRIDGE, Carroll, MD | Pass | State |
| 2025-04-24 | AMRIZE — high-priority violation on file | HAGERSTOWN, Washington, MD | Pass | State |
| 2025-04-23 | PSEG KEYS ENERGY CENTER | BRANDYWINE, Prince George's, MD | Pass | State |
| 2025-04-17 | GAYLORD ENTERTAINMENT COMPANY — high-priority violation on file | OXON HILL, Prince George's, MD | Pass | State |
| 2025-04-15 | LEHIGH CEMENT COMPANY - UNION BRIDGE | UNION BRIDGE, Carroll, MD | Pass | State |
| 2025-04-09 | CURTIS BAY ENERGY, LP — high-priority violation on file | BALTIMORE, Baltimore (city), MD | Fail | State |
| 2025-04-01 | PERDUE AGRIBUSINESS INC, ZION CHURCH ROAD COMPLEX — high-priority violation on file | SALISBURY, Wicomico, MD | Pass | State |
| 2025-03-12 | ADVENTIST HEALTH CARE WHITE OAK MEDICAL CENTER | SILVER SPRING, Montgomery, MD | Pass | State |
| 2025-03-04 | DOMINION ENERGY COVE POINT LNG, LP | LUSBY, Calvert, MD | Pass | State |
| 2025-01-31 | CHALK POINT POWER, LLC | AQUASCO, Prince George's, MD | Pass | State |
| 2025-01-30 | TRANSCONTINENTAL GAS PIPELINE | ELLICOTT CITY, Howard, MD | Pass | State |
| 2025-01-29 | DICKERSON POWER, LLC | DICKERSON, Montgomery, MD | Pass | State |
| 2025-01-09 | CURTIS BAY ENERGY, LP — high-priority violation on file | BALTIMORE, Baltimore (city), MD | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.