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World wastewater treatment plant observatory · data as reported by each inventory

Wastewater treatment plants in United States · Maryland

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181 inventory records · EPA Clean Watersheds Needs Survey 2022

Data years: 2022. The inventory date does not establish current operation.

181 results

CompareNameNative sizeYear
BACK RIVER WWTPBaltimore180 MGD (million gallons per day)2022
Patapsco WWTPBaltimore73 MGD (million gallons per day)2022
WESTERN BRANCH WWTPUpper Marlboro30 MGD (million gallons per day)2022
PISCATAWAY WWTPAccokeek30 MGD (million gallons per day)2022
Little Patuxent WWTPSavage25.03 MGD (million gallons per day)2022
Upper Potomac River Comm WWTPWesternport22.5 MGD (million gallons per day)2022
SOD RUN WWTPAberdeen20 MGD (million gallons per day)2022
SENECA CREEK WWTPGermantown20 MGD (million gallons per day)2022
John J. DiFonzo Water Reclamation FacilityCumberland19.5 MGD (million gallons per day)2022
Mattawoman WWTPLa Plata15.24 MGD (million gallons per day)2022
COX CREEK WWTPCurtis Bay15 MGD (million gallons per day)2022
Annapolis City WWTPAnnapolis14.4 MGD (million gallons per day)2022
OCEAN CITY WWTPOcean City14 MGD (million gallons per day)2022
HAGERSTOWN WPCFHagerstown10.5 MGD (million gallons per day)2022
Gas House Pike WWTPFrederick9 MGD (million gallons per day)2022
Cambridge WWTF & Coll. Sys.Cambridge8.1 MGD (million gallons per day)2022
PATUXENT WWTPCrofton7.5 MGD (million gallons per day)2022
PARKWAY STPLaurel7.5 MGD (million gallons per day)2022
SALISBURY WWTFSalisbury6.8 MGD (million gallons per day)2022
Ballenger/McKinney WWTPFrederick6.2 MGD (million gallons per day)2022
BROADNECK WWTPAnnapolis6 MGD (million gallons per day)2022
Marlay-Taylor WRFLexington Park6 MGD (million gallons per day)2022
WESTMINSTER WWTPWestminster5.07 MGD (million gallons per day)2022
ABERDEEN WWTPAberdeen4 MGD (million gallons per day)2022
EASTON WWTPEaston4 MGD (million gallons per day)2022
Conococheague WWTPWilliamsport4 MGD (million gallons per day)2022
Freedom District WWTPSykesville3.5 MGD (million gallons per day)2022
Havre de Grace WWTPHavre De Grace3.36 MGD (million gallons per day)2022
Bowie Belair WWTPBowie3.3 MGD (million gallons per day)2022
ELKTON WWTPElkton3.2 MGD (million gallons per day)2022
Kent Nrrws/Stevensville/GrasonvilleStevensville3 MGD (million gallons per day)2022
MARYLAND CITY WWTPLaurel2.5 MGD (million gallons per day)2022
Ocean Pines WWTPBerlin2.5 MGD (million gallons per day)2022
DEEP CREEK LAKE WWTPOakland2.2 MGD (million gallons per day)2022
Dorsey Run Advanced WWTPJessup2 MGD (million gallons per day)2022
BROADWATER WWTPChurchton2 MGD (million gallons per day)2022
Seneca Point (NERAWWTP)Charlestown2 MGD (million gallons per day)2022
Trout Run WWTP & Coll. Sys.Oakland1.8 MGD (million gallons per day)2022
Aberdeen Area Wastewater Treatment PlantAberdeen Proving Ground1.7 MGD (million gallons per day)2022
PERRYVILLE WWTPPerryville1.65 MGD (million gallons per day)2022
Hurlock WWTP & Collection SystemHurlock1.65 MGD (million gallons per day)2022
Maryland Correctional Inst. (MCI)Boonsboro1.6 MGD (million gallons per day)2022
POCOMOKE CITY WWTPPocomoke City1.53 MGD (million gallons per day)2022
LA PLATA WWTPLa Plata1.5 MGD (million gallons per day)2022
DAMASCUS WWTPGaithersburg1.5 MGD (million gallons per day)2022
BRUNSWICK WWTPBrunswick1.4 MGD (million gallons per day)2022
PRINCESS ANNE WWTPPrincess Anne1.26 MGD (million gallons per day)2022
North Branch WWTPCumberland1.25 MGD (million gallons per day)2022
Mt. Airy WWTPMount Airy1.2 MGD (million gallons per day)2022
DENTON WWTPDenton1.2 MGD (million gallons per day)2022
CHESAPEAKE BEACH WWTPChesapeake Beach1.18 MGD (million gallons per day)2022
TANEYTOWN STPTaneytown1.1 MGD (million gallons per day)2022
Meadow View WWTPElkton1 MGD (million gallons per day)2022
THURMONT WWTPThurmont1 MGD (million gallons per day)2022
CRISFIELD WWTPCrisfield1 MGD (million gallons per day)2022
Winebrenner WWTPCascade1 MGD (million gallons per day)2022
JOPPATOWNE WWTPJoppa0.95 MGD (million gallons per day)2022
Hampstead WWTP & Coll. Sys.Hampstead0.9 MGD (million gallons per day)2022
CHESTERTOWN WWTPChestertown0.9 MGD (million gallons per day)2022
Delmar STP & Coll. Sys.Delmar0.85 MGD (million gallons per day)2022
FRUITLAND WWTPFruitland0.8 MGD (million gallons per day)2022
FEDERALSBURG WWTFFederalsburg0.75 MGD (million gallons per day)2022
EMMITSBURG WWTPEmmitsburg0.75 MGD (million gallons per day)2022
Berlin WWTPBerlin0.75 MGD (million gallons per day)2022
POOLESVILLE STPPoolesville0.75 MGD (million gallons per day)2022
Piney Orchard WRFOdenton0.7 MGD (million gallons per day)2022
SOLOMONS ISLAND WWTPLusby0.7 MGD (million gallons per day)2022
LEONARDTOWN STPLeonardtown0.68 MGD (million gallons per day)2022
CENTREVILLE WWTPCentreville0.67 MGD (million gallons per day)2022
SNOW HILL WWTPSnow Hill0.67 MGD (million gallons per day)2022
Talbot County Region II WWTPEaston0.66 MGD (million gallons per day)2022
George's Creek WWTPWesternport0.6 MGD (million gallons per day)2022
GRANTSVILLE WWTPGrantsville0.6 MGD (million gallons per day)2022
Manchester WWTP & Coll. Sys.Manchester0.55 MGD (million gallons per day)2022
RISING SUN STPRising Sun0.5 MGD (million gallons per day)2022
INDIAN HEAD WWTPIndian Head0.5 MGD (million gallons per day)2022
ROCK HALL WWTPRock Hall0.48 MGD (million gallons per day)2022
Eastern Correctional Institution WWTPWestover0.48 MGD (million gallons per day)2022
BOONSBORO WWTPBoonsboro0.46 MGD (million gallons per day)2022
Mystic Harbour WWTPBerlin0.45 MGD (million gallons per day)2022
Prince Frederick WWTP IBarstow0.45 MGD (million gallons per day)2022
Hancock STPHancock0.38 MGD (million gallons per day)2022
Cherry Hill WWTPElkton0.37 MGD (million gallons per day)2022
SMITHSBURG WWTPSmithsburg0.333 MGD (million gallons per day)2022
Swan Point WWTPIssue0.3 MGD (million gallons per day)2022
JEFFERSON WWTPJefferson0.3 MGD (million gallons per day)2022
MYERSVILLE WWTPMyersville0.3 MGD (million gallons per day)2022
PRINCE FREDERICK WWTP IIPrince Frederick0.3 MGD (million gallons per day)2022
Industrial Park WWTPPrince Frederick0.3 MGD (million gallons per day)2022
Twin Cities WWTPSecretary0.281 MGD (million gallons per day)2022
Greensboro WWTPGreensboro0.28 MGD (million gallons per day)2022
Riddle Farm WWTPBerlin0.277 MGD (million gallons per day)2022
Tolchester WWTPChestertown0.265 MGD (million gallons per day)2022
MIDDLETOWN WWTPMiddletown0.25 MGD (million gallons per day)2022
Middletown East WWTPMiddletown0.25 MGD (million gallons per day)2022
Worton/Butlertown STPWorton0.25 MGD (million gallons per day)2022
WOODSBORO STPWoodsboro0.25 MGD (million gallons per day)2022
POINT OF ROCKS STPPoint Of Rocks0.23 MGD (million gallons per day)2022
UNION BRIDGE WWTPUnion Bridge0.21 MGD (million gallons per day)2022
Ridgely WWTPRidgely0.2 MGD (million gallons per day)2022

Regulatory context

General reference. This is not an exhaustive review of applicable law.

United States: Clean Water Act / NPDES

NPDES regulates pollutant discharges from point sources to waters of the United States. The permit sets limits and monitoring conditions. A CWNS code identifies an inventory record, not an NPDES permit.

  • Permit identifier and permitting authority: EPA or an authorized state.
  • Outfall and receiving water; sewer connections follow a different control route.
  • Current permit conditions, limits and dated measurements; these are not included in CWNS.

References reviewed: 2026-11-06. Individual applicability: undetermined. This profile does not establish authorization or compliance.