EPA Air · stack tests by state and year

Air-emissions stack tests in Maryland, 2026

28Stack 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 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Counties in Maryland, 2026

Maryland, other years

Air-emissions stack tests recorded in Maryland, 2026

Date	Facility	Where	Kind	Agency
2026-08-25	ALPHA RIDGE LANDFILL	MARRIOTTSVILLE, Howard, MD	Pending	State
2026-07-28	CITGO/ZENITH PETROLEUM TERMINAL	CURTIS BAY, Baltimore (city), MD	Pass	State
2026-07-14	WILDCAT POINT GENERATION FACILITY	CONOWINGO, Cecil, MD	Pending	State
2026-07-14	WILDCAT POINT GENERATION FACILITY	CONOWINGO, Cecil, MD	Pending	State
2026-07-14	WSSC PISCATAWAY SWGE PLNT — high-priority violation on file	ACCOKEEK, Prince George's, MD	Pass	State
2026-07-08	JOHNS HOPKINS HOSPITAL — high-priority violation on file	BALTIMORE, Baltimore (city), MD	Pass	State
2026-07-02	UNIVERSITY OF MARYLAND ST. JOSEPH MEDICAL CENTER	TOWSON, Baltimore, MD	Pass	State
2026-06-24	EASTON UTILITIES - WASHINGTON STREET	EASTON, Talbot, MD	Pending	State
2026-06-22	TEXAS EASTERN TRANSMISSION	ACCIDENT, Garrett, MD	Pass	State
2026-05-27	NAVAL SUPPORT FACILITY, INDIAN HEAD — high-priority violation on file	INDIAN HEAD, Charles, MD	Fail	State
2026-05-27	HARFORD WASTE DISPOSAL CENTER	STREET, Harford, MD	Pass	State
2026-05-18	RAVEN POWER FORT SMALLWOOD LLC	CURTIS BAY, Anne Arundel, MD	Pass	State
2026-05-15	LEHIGH CEMENT COMPANY - UNION BRIDGE	UNION BRIDGE, Carroll, MD	Pass	State
2026-04-29	UNITED STATES GYPSUM COMPANY	CURTIS BAY, Baltimore (city), MD	Pass	State
2026-04-28	DOMINION ENERGY COVE POINT LNG, LP	LUSBY, Calvert, MD	Pass	State
2026-04-24	WHEELABRATOR BALTIMORE, LP	BALTIMORE, Baltimore (city), MD	Pass	State
2026-04-16	AMRIZE — high-priority violation on file	HAGERSTOWN, Washington, MD	Pass	State
2026-04-15	CENTERS FOR MEDICARE & MEDICAID SERVICES	WINDSOR MILL, Baltimore, MD	Pass	State
2026-04-14	LEHIGH CEMENT COMPANY - UNION BRIDGE	UNION BRIDGE, Carroll, MD	Pass	State
2026-03-11	CURTIS BAY ENERGY, LP — high-priority violation on file	BALTIMORE, Baltimore (city), MD	Pass	State
2026-02-27	DOMINION ENERGY COVE POINT LNG, LP	LUSBY, Calvert, MD	Pass	State
2026-02-25	RAVEN POWER FORT SMALLWOOD LLC	CURTIS BAY, Anne Arundel, MD	Pass	State
2026-02-25	UNIVERSITY OF MARYLAND CAPITAL REGION MEDICAL CENTER	LARGO, Prince George's, MD	Pass	State
2026-02-25	EASTON UTILITIES - WASHINGTON STREET	EASTON, Talbot, MD	Pass	State
2026-02-24	SHADY GROVE ADVENTIST HOSPITAL	ROCKVILLE, Montgomery, MD	Pass	State
2026-02-12	DOMINION ENERGY COVE POINT LNG, LP	LUSBY, Calvert, MD	Pass	State
2026-01-21	W. R. GRACE & CO. - CONN.	CURTIS BAY, Baltimore (city), MD	Pass	State
2026-01-07	SHADY GROVE ADVENTIST HOSPITAL	ROCKVILLE, Montgomery, MD	Pass	State

Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.