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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
FOUNTAINDALE WWTPMiddletown0.2 MGD (million gallons per day)2022
St. Clement's Shores WWTPLeonardtown0.2 MGD (million gallons per day)2022
CLEAR SPRING WWTPClear Spring0.2 MGD (million gallons per day)2022
FUNKSTOWN WWTPFunkstown0.2 MGD (million gallons per day)2022
BETTERTON WWTPBetterton0.2 MGD (million gallons per day)2022
TRAPPE WWTPTrappe0.2 MGD (million gallons per day)2022
GREENBRIER STATE PARKBoonsboro0.18 MGD (million gallons per day)2022
QUEENSTOWN WWTPQueenstown0.17 MGD (million gallons per day)2022
SHARPTOWN WWTPSharptown0.17 MGD (million gallons per day)2022
Antietam WWTPSharpsburg0.16 MGD (million gallons per day)2022
Cobb Island WWTPCobb Island0.158 MGD (million gallons per day)2022
Marley Run WWTPPasadena0.15 MGD (million gallons per day)2022
Talbot County Region V WWTPTilghman0.15 MGD (million gallons per day)2022
OXFORD WWTPOxford0.15 MGD (million gallons per day)2022
PORT DEPOSIT WWTPPort Deposit0.15 MGD (million gallons per day)2022
Rawlings WWTP and Collection SystemRawlings0.143 MGD (million gallons per day)2022
Wicomico Shores WWTPChaptico0.141 MGD (million gallons per day)2022
VIENNA WWTPVienna0.137 MGD (million gallons per day)2022
NEW WINDSOR WWTPNew Windsor0.115 MGD (million gallons per day)2022
Preston WWTPPreston0.115 MGD (million gallons per day)2022
PITTSVILLE WWTPPittsville0.115 MGD (million gallons per day)2022
GALENA WWTPGalena0.11 MGD (million gallons per day)2022
Millington/Sandfield WWTPMillington0.105 MGD (million gallons per day)2022
HEBRON WWTPHebron0.101 MGD (million gallons per day)2022
Pleasant Branch WWTPIjamsville0.1 MGD (million gallons per day)2022
CECILTON WWTPCecilton0.1 MGD (million gallons per day)2022
Friendsville WWTPFriendsville0.1 MGD (million gallons per day)2022
Mill Bottom WWTSMount Airy0.1 MGD (million gallons per day)2022
ACCIDENT WWTPAccident0.09 MGD (million gallons per day)2022
RICHLYN MANOR WWTPGlen Arm0.09 MGD (million gallons per day)2022
Sudlersville WWTPSudlersville0.09 MGD (million gallons per day)2022
Charlotte Hall Veterans' Home WWTSCharlotte Hall0.087 MGD (million gallons per day)2022
Willards WWTPWillards0.08 MGD (million gallons per day)2022
CHURCH HILL STPChurch Hill0.08 MGD (million gallons per day)2022
Chesapeake City North STPChesapeake City0.075 MGD (million gallons per day)2022
Clifton on the Potomac WWTPNewburg0.07 MGD (million gallons per day)2022
Harbor View WWTPChesapeake City0.065 MGD (million gallons per day)2022
Ewell-Rhodes Point WWTPEwell0.065 MGD (million gallons per day)2022
College of Southern Maryland WWTPLa Plata0.06 MGD (million gallons per day)2022
KENNEDYVILLE STPKennedyville0.06 MGD (million gallons per day)2022
SWALLOW FALLS STATE PARKOakland0.06 MGD (million gallons per day)2022
Elk Neck State ParkNorth East0.06 MGD (million gallons per day)2022
Deep Creek Lake State ParkSwanton0.053 MGD (million gallons per day)2022
Newark STPNewark0.052 MGD (million gallons per day)2022
Barton Business Park WWTPCumberland0.05 MGD (million gallons per day)2022
WHITE ROCK WWTPFrederick0.05 MGD (million gallons per day)2022
Bloomington WWTPBloomington0.05 MGD (million gallons per day)2022
Forrest Farm WWTFHollywood0.05 MGD (million gallons per day)2022
Victor Cullen WWTPSabillasville0.05 MGD (million gallons per day)2022
FLINTSTONE-GILPIN WWTPFlintstone0.045 MGD (million gallons per day)2022
Southern Senior High SchoolHarwood0.04 MGD (million gallons per day)2022
OLDTOWN WWTPOldtown0.04 MGD (million gallons per day)2022
Kitzmiller WWTSKitzmiller0.04 MGD (million gallons per day)2022
FAIRMOUNT STPWestover0.04 MGD (million gallons per day)2022
Jude House Package WWTP (Bel Alton WWTP)Bel Alton0.032 MGD (million gallons per day)2022
EASTERN PRERELEASE STPChurch Hill0.03 MGD (million gallons per day)2022
Poplar HillQuantico0.03 MGD (million gallons per day)2022
Cheltenham WWTPCheltenham0.03 MGD (million gallons per day)2022
ASSATEAGUE STATE PARK TPBerlin0.03 MGD (million gallons per day)2022
CRELLIN WWTPOakland0.027 MGD (million gallons per day)2022
Northern High SchoolOwings0.025 MGD (million gallons per day)2022
Keyser's Ridge WWTPGrantsville0.025 MGD (million gallons per day)2022
Mt. Carmel Woods WWTPLa Plata0.021 MGD (million gallons per day)2022
Sandy Hook WWTPKnoxville0.021 MGD (million gallons per day)2022
Runnymede WWTPWestminster0.02 MGD (million gallons per day)2022
North Harford High School WWTPPylesville0.02 MGD (million gallons per day)2022
Preserve at Wye MIls WWTPWye Mills0.02 MGD (million gallons per day)2022
Pleasant Valley WWTPWestminster0.02 MGD (million gallons per day)2022
TYLERTON WWTPTylerton0.02 MGD (million gallons per day)2022
Southern MD Prerelease UHughesville0.02 MGD (million gallons per day)2022
Point Lookout State Park WWTPScotland0.02 MGD (million gallons per day)2022
Hyattstown WWTPClarksburg0.02 MGD (million gallons per day)2022
Chopticon High School WWTPMorganza0.017 MGD (million gallons per day)2022
South Carroll High School WWTPSykesville0.015 MGD (million gallons per day)2022
Mardela High School WWTPMardela Springs0.014 MGD (million gallons per day)2022
SPRING MEADOWS WWTPJarrettsville0.01 MGD (million gallons per day)2022
Fort Frederick State ParkBig Pool0.01 MGD (million gallons per day)2022
GORMAN WWTPOakland0.009 MGD (million gallons per day)2022
GREENRIDGE FORESTRY CAMPFlintstone0.008 MGD (million gallons per day)2022
NEW GERMANY STATE PARKGrantsville0.006 MGD (million gallons per day)2022
Glen Arm Maintenance FacilityGlen Arm0.005 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.