NPDES discharge permits — MD
392 active individual permits with limits in EPA's file of 2026-09-19.
- AA CO DPW-Bureau of Utility Operations and City of Annapolis PWA MD0021814 · major
- AES WARRIOR RUN, INCORPORATED MD0066079
- ALLEGANY COUNTY DPW - UTIL. DIV. FLINSTONE WWTP MD0055620
- ALLEGANY COUNTY DPW, UTILITIES DIVISION MD0070530
- AMERICAN SUGAR REFINING,INC. MD0001341 · major
- AMERICAN WATER OPERATIONS and MAINTENANCE, INC. MD0021717 · major
- ANNE ARUNDEL COUNTY DPW- BUREAU OF UTILITIES MD0069868 · major
- Aberdeen Proving Ground, Aberdeen Area WWTP MD0021237 · major
- Allegany County Department of Public Works - Utilities Division MD0063878 · major
- Allegany County Dept. of Public Works - Utilities Division MD0060071
- Allegany Department of Public Works - Utilities Division MD0068896
- Anne Arundel County DPW, Bureau of Utility Operations MD0021652 · major
- Anne Arundel County DPW, Bureau of Utility Operations MD0062596 · major
- Anne Arundel County Department of Public Works MD0059145
- Anne Arundel County Public Schools MD0069582
- BACK RIVER WWTP MD0021555 · major
- BALTIMORE COUNTRY CLUB AT FIVE FARMS MD0068888
- BALTIMORE COUNTY DPW, UITL. DIV. MD0022713
- BEL ALTON WWTP MD0050334
- BETTERTON WWTP MD0020575
- BITUMAR U S A,INC. MD0068381
- BLOOMINGTON WWTP MD0060933
- BLUEKNIGHT ENERGY PARTNERS MD0064556
- BOARD OF EDUCATION OF CHARLES COUNTY MD0023175
- BOARD of COUNTY COMMISSIONERS of CECIL COUNTY MD0024023
- BOONES ESTATE MHC, LLC MD0050903
- BROADFORDING BIBLE BRETHREN CH MD0051373
- BROADNECK WATER RECLAMATION FACILITY MD0021644 · major
- BROADWATER WWTP MD0024350 · major
- BROOK LANE PSYCHIATRIC CENTER MD0053198
- BROOKFIELD RENEWABLE POWER, PINEY and DEEP CREEK, LLC MD0059064
- BRUNSWICK WWTP MD0020958 · major
- BTR HAMPSTEAD,LLC. MD0001881
- BTR-5200, LLC MD0024635
- BUILDING MATERIALS CORPORATION OF AMERICA MD0001988
- BWI SPARROWS POINT, LLC MD0001180
- Baltimore City DPW MD0021601 · major
- Baltimore County DPW MD0063924
- Bureau of Utilities MD0066745
- Burgess and Commissioners of Middletown MD0024406
- CALVERT CLIFFS NUC. POWER PLANT, LLC MD0002399 · major
- CAMBRIDGE, INC. MD0067458
- CAMP SHADOWBROOK MD0053139
- CARGILL, INC. - SALT DIVISION MD0060437
- CEDAR RIDGE MINISTRIES MD0067881
- CENTER POINT TERMINAL COMPANY,LLC MD0024716
- CENTER POINT TERMINAL Company MD0055565
- CHESAPEAKE BEACH WWTP MD0020281 · major
- CHESAPEAKE COLLEGE WWTP MD0024384
- CHESTERTOWN WWTP MD0020010
- CHOPTICON HIGH SCHOOL MD0051918
- CITGO PETROLEUM CORPORATION MD0001929
- CITY OF ABERDEEN MD0021563 · major
- CITY OF BOWIE MD0021628 · major
- CITY OF CAMBRIDGE MD0021636 · major
- CITY OF HAGERSTOWN WATER DEPT. MD0003484
- CITY OF HAVRE DE GRACE WTP MD0069710
- CLIFTON ON THE POTOMAC WWTP MD0055557
- CNX Marine Terminals, Inc. MD0055824
- COLLEGE OF SOUTHERN MARYLAND MD0052311
- COLONIAL PIPELINE COMPANY MD0057886
- COLONIAL PIPELINE COMPANY MD0060968
- CONGOLEUM CORPORATION MD0001384 · major
- CONSTELLATION ENERGY GENERATION, LLC MD0002518 · major
- COX CREEK WRF MD0021661 · major
- CRANBERRY WATER TREATMENT PLT. MD0067644
- CSO ALLEGANY COUNTY FROSTBURG MD0067423
- CSO ALLEGANY COUNTY LAVALE MD0067547
- CSO ALLEGHANY COUNTY D.P.W. MD0067407
- CYPRESS REALTY INVESTMENTS, LLC MD0071790
- Calvert County Board of Education MD0052167
- Caroline County Board of Education MD0023621
- Caroline County Board of Education MD0055522
- Carroll County DPW, Bureau of Utilities MD0065927
- Carroll County Government Bureau of Utilities MD0067652
- Cecil County DPW MD0020796
- Cecil County Department of Public Works MD0052825
- Cecil County Dept. of Public Works MD0052027 · major
- Charles County Board of Education MD0023451
- Cinnamon Woods Waste Water Treatment Plant MD0069949
- City of Baltimore Department of Public Works MD0003034
- City of Crisfield MD0020001 · major
- City of Frostburg MD0063487
- City of Fruitland MD0052990
- City of Hagerstown - Water and Sewer Department MD0021776 · major
- City of Hagerstown Water Department MD0067741
- City of Havre de Grace MD0021750 · major
- City of Salisbury, Wastewater Treatment Branch MD0021571 · major
- Commissioners of Ridgely MD0020427
- Commissioners of Sharptown MD0052175
- Commissioners of Sudlersville MD0020559
- Concord Mobile Home Park Wastewater Treatment Plant MD0023060
- Concrete General Inc MD0072214
- Constellation Power Source Generation, LLC MD0068993
- Council of Unit Owners of Park Place, A Condominium MD0068861
- DEPARTMENT OF THE NAVY - NAS P MD0020150
- DEPT OF NATURAL RESOURCES, FISHERIES SERVICE MD0055743
- DOMINION COVE POINT LNG, LP MD0063975
- DUNDALK MARINE TERMINAL MD0066818
- Darling Ingredients - Linkwood MD0003247
- Deale Aquaculture Farm, Inc. MD0071986
- Department of Army MD0021229 · major
- Department of Homeland Security, Federal Emergency Management Agency MD0025666
- Department of public works MD0023876
- Department of the Army, US Army Garrison Ft. Detrick MD0020877 · major
- Department of the Navy, Washington Navy Yard MD0003051
- Dept. of the Navy, NAVAL SUPPORT FACILITY, INDIAN HEAD MD0003158 · major
- Discovery National, LLC WWTP MD0023710
- EASTERN CORRECTIONAL INSTITUTE MD0066613
- EASTON UTILITIES MD0020273 · major
- EASTON UTILITIES COMMISSION MD0022772
- EDGEMEADE ROAD RE., LLC MD0052680
- ELK RIDGE WTP MD0067962
- EMERSUB 16, LLC MD0069094
- EMMITSBURG WWTP MD0020257
- Eastman Specialties Corporation MD0000345 · major
- Environmental Management & Industrial Hygiene, WMATA MD0069774
- Epping Forest, Incorporated MD0071650
- Evonik Corporation MD0000531
- FAHRNEY-KEEDY MEMORIAL HOME MD0053066
- FEDERALSBURG WWTP MD0020249
- FERRY COVE PROJECT LLC - OYSTER NURSERY MD0072168
- FOUNTAINDALE WWTP MD0022721
- FREDERICK COUNTY DIV OF UTILITIES AND SOLID WASTE MGMT. MD0022683
- FREDERICK COUNTY DIV. OF UTILITIES AND SOLID WASTE MD0021822 · major
- FREEDOM DISTRICT WWTP MD0021512 · major
- FRIENDSVILLE WWTP MD0021083
- FUNKSTOWN WWTP MD0020362
- Forest Green Court Mobile Home Park Wastewater Treatment Plant MD0053279
- Foxville Garden WWTP MD0025119
- Frederick County Division of Utilities & Solid Waste Management MD0025089
- Frederick County Division of Utilities and Solid Waste Management MD0020737
- GARRETT COUNTY SANITARY DISTRICT, INC. MD0054348 · major
- GARRETT COUNTY SANITARY DISTRICT, INC. MD0069418
- GENERAL ELECTRIC COMPANY MD0067938
- GRACE DAVISON-CURTIS BAY MD0000311 · major
- GREAT OAK LANDING LIMITED PART MD0024945
- GREEN RIDGE YOUTH CAMP WWTP MD0024988
- GREENBRIER STATE PARK WWTP MD0023868
- Garret County Sanitary District, Inc. - Dept. of Public Utilities MD0060950
- Garrett County Board of Education MD0024449
- Garrett County Department of Public Utilities MD0051497
- Garrett County Sanitary District, Inc. MD0052281
- Garrett County Sanitary District, Inc. - Dept. of Public Utilities MD0060941
- GenOn - Mid-Atlantic, LLC (MORGANTOWN STATION) MD0002674 · major
- GenOn Chalk Point, LLC MD0002658 · major
- GenOn MD Ash Management, LLC MD0057584
- GenOn Maryland Ash Management, LLC MD0056928
- GenOn Mid-Atlantic, LLC MD0054836
- Grantsville, Town of MD0020761
- H & H STORAGE LTD. MD0020028
- HAMPSTEAD WWTP MD0022446
- HAPPY HILLS CAMPGROUND WWTP MD0065757
- HARFORD COUNTY DEPT OF PUBLIC WORKS - TOLLGATE LANDFILL MD0065765
- HARFORD COUNTY PUBLIC SCHOOLS HICKORY ANNEX MD0070696
- HARWOOD LANDFILL, INC. MD0066087
- HESS CORPORATION MD0001767
- HIGHLAND VIEW ACADEMY, INC. MD0024627
- HOLIDAY MOBILE ESTATE, INC. MD0053082
- HOMESTEAD MHP, LLC c/o PINKARD PROPERTIES, LLC MD0053171
- HOOPERS ISLAND OYSTER COMPANY MD0072028
- HOWARD COUNTY DPW MD0067865
- HOWARD COUNTY DPW MD0068039
- Harford County DPW (Sod Run WWTP) MD0056545 · major
- Harford County DPW - Joppatowne WWTP MD0022535
- Harford County Department of Public Works (Spring Meadows WWTP) MD0024953
- Hawkins Landfill MD0066206
- Holcim (US) Inc. MD0002151
- Homestead Mobile Estates WWTP MD0024961
- Howard County DPW, Bureau of Environment Service MD0067873
- Howard County Department of Public Works MD0055174 · major
- International Monetary Fund - Bretton Woods Rec. Ctr. MD0064777
- JHMI Utilities, LLC - Johns Hopkins Hospital MD0071196
- JOHN W.RITTER TRUCKING,INC. MD0068713
- Jones Estates Bay County II, LLC MD0071552
- KELLY FOODS CORPORATION, INC. MD0001309
- KENNEDYVILLE WWTP MD0052671
- KINDER MORGAN PHOENEX, LLC MD0000396
- KUNZANG ODSAL PALYUL CHANGCHUB CHOLING (KPC) WWTP MD0067539
- Kent County Dept of Public Works MD0070751
- Kent county Dept. of Water & Wastewater Services MD0020303
- Kiewit Infrastructure Co. MD0068489
- LA PLATA WWTP MD0020524 · major
- LANDSMAN, LLC. MD0023272
- LEHIGH CEMENT COMPANY MD0000779
- LEONARDTOWN WWTP MD0024767 · major
- LEWISTOWN WWTP MD0022900
- LITTLE ORLEANS CAMPGROUND WWTP MD0062375
- LOCKHEED MARTIN CORPORATION MD0071773
- LYONS CREEK MHC, LLC MD0053511
- Lakeshore Management, INC MD0024546
- Lanco=Pennland MD0063592
- Legacy Enterprises LLC MD0057487
- Linde Incorporated MD0054101
- MARLEY-TAYLOR W.R.F. MD0021679 · major
- MARYLAND AVIATION ADMINSTRATION MD0063371
- MARYLAND CORRECTIONAL INSTITUTION MD0023957 · major
- MARYLAND ENVIRONMENTAL SERVICE MD0023949
- MARYLAND ENVIRONMENTAL SERVICE MD0065111
- MARYLAND MOBILE ESTATES, LLC MD0024333
- MARYLAND PORT ADMINISTRATION MDDRG3890
- MARYLAND WATER SERVICE, INC. MD0022748
- MATTAWOMAN WWTP MD0021865 · major
- MAYOR and COUNCIL OF MANCHESTER MD0022578
- MD DEPARTMENT OF NATURAL RESOURCES MD0054054
- MD-SHA - GREENHILL COVE WWTP MD0063916
- MD. & VIRGINIA MILK PROD.COOP. MD0000469
- MDTA Port Administration- Hawkins Point MD0001261
- MEADOWVIEW WWTP MD0022641
- METTIKI COAL,LLC MD0055182 · major
- MIDLOTHIAN WATER COMPANY MD0066958
- MILL BOTTOM WWTP MD0065439
- MILLINGTON WWTP MD0020435
- MOBILE REALTY 2, LLC MD0071374
- MONTEBELLO W.T.P. MD0003042
- MORNING CHEER,INC./SANDY COVE MINISTRIES MD0052299
- MOTIVA ENTERPRISES, LLC MD0000744
- MOTIVA ENTERPRISES, LLC. MD0001082
- MOUNT ST.MARYS COLLEGE MD0023230
- MSU -ESTUARINE RESEARCH CENTER MD0003093
- MT. AIRY WWTP MD0022527 · major
- MT. CARMEL WOODS WWTP MD0053228
- MYERSVILLE WWTP MD0020699
- Maryland Department of Natural Resources MD0051624
- Maryland Environmental Service MD0023906
- Maryland Environmental Service MD0023922
- Maryland Environmental Service MD0023931
- Maryland Environmental Service MD0023981
- Maryland Environmental Service MD0062073
- Maryland Environmental Service MD0062821
- Maryland Environmental Service (MES) MD0063207 · major
- Maryland Environmental Service - ELK NECK STATE PARK WWTP MD0023833
- Maryland Environmental Service, Water/Watewater Division MD0067903
- Maryland Management Company, Inc. MD0022926
- Maryland State Highway Administation MD0069680
- Mayor and City of Cumberland MD0021598 · major
- Mayor and Council of Town of Hurlock MD0022730 · major
- Mayor and Town Council of Oakland MD0020648
- Montgomery County Government, Department of General Services MD0068195
- NASA - GODDARD SPACE FLIGHT CENTER MD0067482
- NATIONAL AQUARIUM IN BALTIMORE MD0059676
- NATIONAL INSTITUTES OF HEALTH MD0020931
- NATIONAL INSTITUTES OF HEALTH MD0025496
- NAVAL RESEARCH LABORATORY MD0020168
- NAVAL SUPORT FACILITY INDIAN HEAD MD0020885
- NEW DESIGN ROAD W.T.P. MD0061841
- NEW LIFE FOUR SQUARE CHURCH MD0057100
- NEXTCAR BALTIMORE NATIONAL PIKE MD0072061
- NORTH HARFORD JR/SR/H.S. WWTP MD0023281
- NORTHEAST MD WASTE DISPOSAL MD0065447
- NORTHROP GRUMMAN SYSTEMS CORPORATION, ELKTON MD0000078
- National Park Service, Assateague Island National Seashore MD0021091
- Naval Support Activity (NSA) Annapolis MD0023523
- Northrop Grumman Systems Corporation MD0072222
- OCEAN CITY LIMITED PARTNERSHIP c/o CORDISH COMPANY MD0071161
- OLD DOMINION ELECTRIC COOPERATIVE MD0071901
- OLD SOUTH MOUNTAIN INN WWTP MD0055425
- OLDTOWN WWTP MD0024759
- PETROLEUM FUEL AND TERMINAL CO MD0024708
- PETROLEUM FUEL AND TERMINAL CO MD0057673
- PLEASANT BRANCH WWTP MD0065269
- POINT OF ROCKS WWTP MD0020800
- POTOMAC RIVER W.R.F. MD0051586
- PRESTON WWTP MD0020621
- Parkway Generation Keys Energy Center, LLC MD0072079
- Patuxent MHC, LLC MD0024694
- Patuxent River Utility Services, LLC MD0020095
- Perdue Farms, Inc. MD0000060 · major
- Piney Point Aquaculture Center MD0063843
- Pocomoke City MD0022551 · major
- Presbyterian Senior Living Services, Inc. MD0022951
- Queen Anne's County Dept of Public Works MD0023485 · major
- RAVEN POWER HOLDINGS LLC MD0001503 · major
- RELAX INN WWTP (LAFAYETTE MOT) MD0053201
- RISING SUN WWTP MD0020265
- RITE OF PASSAGE, INC. MD0067571
- ROCKY GAP STATE PARK WWTP MD0051667
- Rawlings Improvement Association, Inc. MD0023213
- Rosebud Mining Company MD0070629 · major
- Rosebud Mining Company MD0072117
- Royall Farms Thurmont WWTP MD0058050
- S.E.W. FRIEL WYE MILLS MD0000043
- SHA - Maryland Department of Transportation MD0023680
- SHA LAKE LOUISE ACID LEACHATE MD0056341
- SHERWIN WILLIAMS COMPANY MD0001295
- SHUFF'S MEAT MARKET, INC. MD0050245
- SMITHSONIAN ENVIRONMENTAL RESEARCH CENTER MD0070327
- SOUTHERN CARROLL H.S. WWTP MD0024589
- SOUTHERN MD. PRE-RELEASE UNIT MD0023914
- SOUTHERN SENIOR HIGH SCHOOL MD0023728
- SPARROWS POINT, LLC MD0001201 · major
- SPRINGVIEW M.HOME PARK WWTP MD0022870
- STONER QUALITY WATER, INC. MD0020818
- SUNOCO PARTNERS MARKETING and TERMINALS L.P. MD0000736
- SWALLOW FALLS STATE PARK WWTP MD0052850
- SWAN HARBOUR DELL MOBILE HOME MD0023043
- SWAN POINT MD0057525
- Sheppard Pratt Health Care System - The Jefferson School MD0067521
- Somerset County Sanitary District, Inc. MD0020656 · major
- Somerset County Sanitary District, Inc. MD0052230
- Spring Garden Steam Plant MD0061930
- Stevenson University WWTP MD0066001
- Sunoco, LLC MD0062278
- Sysco Eastern Maryland, L.L.C. MD0069744
- TANEYTOWN WWTP MD0020672 · major
- TELEDYNE ENERGY SYSTEMS,INC. MD0065901
- THURMONT WWTP MD0021121 · major
- TOLCHESTER WWTP MD0067202
- TOWN OF CLEAR SPRING WTF MD0069132
- TOWN OF DELMAR MD0020532
- TOWN OF DENTON MD0020494
- TOWN OF GRANTSVILLE MD0063274
- TOWN OF INDIAN HEAD WWTP MD0020052
- TOWN OF VIENNA WWTP MD0020664
- TOWN OF WESTERNPORT MD0067384
- TOWN OF WILLARDS MD0051632
- TRANS-TECH,INC. MD0058611 · major
- TRAPPE WWTP MD0020486
- TWIN CITIES WWTP MD0055352
- Talbot County Department of Public Works MD0059463
- Talbot County Government Department of Public Works MD0023604
- Targa Terminals, LLC MD0001449
- The Benedictine School for Exceptional Children Wastewater Treatment Plant MD3893F24
- The City of Frederick MD0021610 · major
- The MUSHROOM COMPANY MD0069019
- The Mayor and Commissioners of Perryville MD0020613 · major
- The Mayor and Town Council of Galena MD0020605
- The Town Of Elkton MD0020681 · major
- The Town of CHURCH HILL MD0050016
- The Town of Clear Spring MD0053325
- The Town of Oakland MD0071307
- The Town of Ocean City MD0020044 · major
- The William Schneider Company, Inc. MD0022845
- Town Of Greensboro MD0071269
- Town of Accident MD0051721
- Town of Boonsboro MD0020231
- Town of CHESAPEAKE CITY North MD0020401
- Town of Cecilton WWTP MD0020443
- Town of Centreville MD0020834
- Town of Emmitsburg MD0062391
- Town of Hancock MD0024562
- Town of Hebron MD0059617
- Town of Middletown - East MD0067628
- Town of New Windsor MD0022586
- Town of OXFORD WWTP MD0022543
- Town of Pittsville Commissioners MD0060348
- Town of Poolesville MD0023001
- Town of Queenstown MD0023370
- Town of Snow Hill MD0022764
- Town of Vienna MD0059471
- U.S ARMY CORPS OF ENGINEERS MD0020206
- U.S. ARMY GARRISON A.P.G. MD0003565
- U.S. COAST GUARD - BALTIMORE Y MD0067300
- U.S. Department of Agriculture, Agricultural Research Service MD0020842
- U.S. Dept of Agriculture-USDA-ARS-FMOD-USS MD0020851
- U.S. Fish & Wildlife Service, Patuxent Research Refuge MD0065358
- UNION BRIDGE WWTP MD0022454
- UNITED STATES GYPSUM COMPANY MD0001457
- UNIV. MD. CHESAPK. BIOL. LAB MD0061051
- UNIVERSITY OF MARYLAND, BALTIMORE MD0054950
- UNIVERSITY OF MARYLAND, CTR. F MD0051403
- UPPER POTOMAC RIVER COMMISSION MD0021687 · major
- United States Dept of Commerce, NOAA, NOS, Cooperative Oxford Laboratory MD0071030
- University Of Maryland College Park, Department of Environmental Safety MD0063801
- VIDHI ALEXANDRIA, LLC MD0053155
- VIENNA POWER LLC MD0000094 · major
- Vibrantz Specialty Products, LLC MD0001775 · major
- W.M.A.T.A.- RED LINE P.S. MD0069035
- WASHINGTON SUBURBAN SANITARY COMMISSION MD0021725 · major
- WASHINGTON SUBURBAN SANITARY COMMISSION - WSSC MD0021491 · major
- WASHINGTON SUBURBAN SANITARY COMMISSION - WSSC MD0021539 · major
- WAYSON'S MOBILE COURT WWTP MD0023647
- WESTMINSTER WWTP MD0021831 · major
- WHEELABRATOR BALTIMORE, L.P. MD0060640
- WOODLAWN ESTATES, LLC MD0023337
- WOODSBORO WWTP MD0058661
- WORTON-BUTLERTOWN WWTP MD0060585
- WRF GROUP MD0071960
- Washington Aqueduct MD0068161
- Washington County Department of Water Quality MD0003221
- Washington County Department of Water Quality MD0024317
- Washington County Department of Water Quality MD0062308
- Washington County Department of Water Quality MD0063509 · major
- Washington County Department of Water Quality MD0064530
- Washington County Department of Water Quality MD0067784
- Washington Suburban Sanitary Commission - WSSC MD0020982 · major
- Washington Suburban Sanitary Commission - WSSC MD0021741 · major
- Washington Suburban Sanitary Commission - WSSC MD0067768
- Wicomico County Board of Education MD0024279
- Worcester County Department of Public Works, Water/Wastewater Division MD0066923
- Worcester County Dept. of Pubic Works, Water/Wastewater Division MD0023477 · major
- YARA BALTIMORE LIQUID TERMINAL MD0071838
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