EPA · discharge permits by state

Discharge permits in Maryland

2,041Current permits
48Major dischargers
325Individual permits

A major discharger is one EPA rates as significant on volume, toxicity or the water it reaches; the rest are minors. An individual permit is written for one operation, while general permit coverage applies a statewide permit to a site that qualifies for it.

This page gathers Maryland’s current permits three ways below — by the program they are issued under, by the city of the discharge, and by watershed. It names 4 programs, 179 cities and 292 watersheds. Each list says which set it covers.

Every permit’s record

Each of the 2,041 current permits in Maryland has a record page: the permittee, the receiving water, the status and dates, and its effluent limits and exceedances. Each city below lists its own; or every permit in Maryland, A to Z.

Pages: 1 2 3

By what is permitted in Maryland

By city

The 179 cities with the most permits. All 179 cities in Maryland with 3 or more permits are listed at every city in Maryland.

Watersheds inside Maryland 292

Every watershed with three or more permits in Maryland, most permits first.

All 292 watersheds in Maryland with 3 or more permits are named on one page at every watershed in Maryland.

Other states

Every state carrying three or more current permits, in alphabetical order.

Permits

Major dischargers first. Not every permit in Maryland is listed here.

Permit holder	NPDES ID	City	Program	Discharger	Receiving water
ANNAPOLIS WRF	MD0021814	ANNAPOLIS	Publicly owned treatment works	Major	LOWER CHESAPEAKE BAY
ASHBURTON FILTRATION PLANT	MD0003034	BALTIMORE		Major	trib.ref. to as Peck's Branch to Gwynns Falls
BACK RIVER WWTP	MD0021555	BALTIMORE COUNTY	Publicly owned treatment works	Major	BACK RIVER, BEAR CREEK & SEVERSTAL STEEL, LLC
BOWLEYS QUARTER INVESTMENTS I, LLC.	MD0001511	BALTIMORE COUNTY		Major	SALT PETER CREEK via SENECA CREEK
BROADWATER WATER RECLAMATION F	MD0024350	CHURCHTON	Publicly owned treatment works	Major	MIDDLE CHESAPEAKE BAY
BRUNSWICK WWTP	MD0020958	BRUNSWICK	Publicly owned treatment works	Major	POTOMAC RIVER
CALVERT CLIFFS NUCLEAR POWER PLANT, LLC	MD0002399	LUSBY		Major	WEST CHESAPEAKE BAY
CAMBRIDGE WWTP	MD0021636	CAMBRIDGE	Publicly owned treatment works	Major	CHOPTANK RIVER
CASCADES TISSUE GROUP - MARYLAND, LLC	MD0066974	HAGERSTOWN		Major	UPPER POTOMAC RIVER
CASSELMAN MINE	MD0070629	GRANTSVILLE		Major	CASSELMAN RIVER
CITY OF SALISBURY WWTP	MD0021571	SALISBURY	Publicly owned treatment works	Major	WICOMICO RIVER
CONSTELLATION POWER - RIVERSID	MD0001481	DUNDALK		Major	PATAPSCO RVR
CRISFIELD WWTP	MD0020001	CRISFIELD	Publicly owned treatment works	Major	LOWER POCOMOKE RIVER
DAMASCUS WATER RESOURCE RECOVERY FACILITY	MD0020982	DAMASCUS	Publicly owned treatment works	Major	MAGRUDER BRANCH -TRIB. TO SENECA CR
EASTALCO ALUMINUM COMPANY	MD0002429	FREDERICK		Major	MIDDLE POTOMAC RIVER
FREEDOM DISTRICT WWTP	MD0021512	SYKESVILLE	Publicly owned treatment works	Major	SOUTH BRANCH PATAPSCO RIVER
FT. SMALLWOOD COMPLEX (FORMERLY WAGNERS STATION)	MD0001503	BRANDON SHORES		Major	PATAPSCO RIVER
GENON - DICKERSON GENERATING	MD0002640	DICKERSON		Major	STEAM AND COMBUSTION TURBINE
GRACE DAVISON-CURTIS BAY	MD0000311	BALTIMORE		Major	PATAPSCO via CURTIS BAY
JOHN J. DIFONZO WATER RECLAMATION FACILITY	MD0021598	CUMBERLAND	Publicly owned treatment works	Major	POTOMAC RIVER, EVITTS CREEK
LA PLATA WWTP	MD0020524	LA PLATA	Publicly owned treatment works	Major	UNNAMED TRIB. OF PORT TABACCO CK
MATTAWOMAN WWTP	MD0021865	CHARLES COUNTY	Publicly owned treatment works	Major	POTOMAC RIVER
MD. CITY WATER RECLAM. FAC.	MD0062596	LAUREL	Publicly owned treatment works	Major	PATUXENT RIVER
METTIKI COAL CORP.	MD0055182	DEER PARK		Major	YOUGHIOGHENY RIVER
MOUNT AIRY WWTP	MD0022527	MOUNT AIRY	Publicly owned treatment works	Major	SOUTH BRANCH OF THE PATAPSCO RIVER
MS4 ANNE ARUNDEL COUNTY	MD0068306	ANNAPOLIS	Publicly owned treatment works	Major	Cabin Creek-Susquehanna River
MS4 CHARLES COUNTY MUNICIPAL SEPAR	MD0068365	LA PLATA	Publicly owned treatment works	Major	Saint Leonard Creek-Patuxent River
MS4 FREDERICK COUNTY	MD0068357	FREDERICK COUNTY	Publicly owned treatment works	Major
MS4 MONTGOMERY COUNTY	MD0068349	FREDERICK COUNTY	Publicly owned treatment works	Major	Upper Cove Run-Lost River
NAVAL SUPPORT FACILITY, INDIAN HEAD	MD0003158	INDIAN HEAD		Major	POTOMAC_RIVER - MATTAWOMAN CREEK
OCEAN CITY WWTP	MD0020044	OCEAN CITY	Publicly owned treatment works	Major	COASTAL AREA
OCEAN PINES WWTP	MD0023477	BERLIN	Publicly owned treatment works	Major	COASTAL AREA
PARKWAY WATER RESOURCE RECOVERY FACILITY	MD0021725	LAUREL	Publicly owned treatment works	Major	PATUXENT RIVER
PATAPSCO WWTP	MD0021601	BALTIMORE	Publicly owned treatment works	Major	PATAPSCO RIVER
PATUXENT AND MARYLAND CITY WATER RECLAMATION FACILITIES	MD0069868	ANNAPOLIS	Publicly owned treatment works	Major	PATUXENT RIVER - MIDDLE via CHESAPEAKE BAY
PATUXENT WATER RECLAMATION FAC	MD0021652	CROFTON	Publicly owned treatment works	Major	PATUXENT RIVER
PERDUE FARMS INC.	MD0000965	SHOWELL		Major	COASTAL AREA
PERDUE FARMS, INC.	MD0000060	SALISBURY		Major	PEGGY BRANCH
POCOMOKE CITY WWTP	MD0022551	POCOMOKE CITY	Publicly owned treatment works	Major	POCOMOKE RIVER
SENECA WATER RESOURCE RECOVERY FACILITY	MD0021491	GERMANTOWN	Publicly owned treatment works	Major	SENECA CREEK

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