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

Wastewater treatment plants in United States · Connecticut

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91 inventory records · EPA Clean Watersheds Needs Survey 2022

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

91 results

CompareNameNative sizeYear
HARTFORD WPCFHartford60 MGD (million gallons per day)2022
NEW HAVEN EAST SHORE WPCFNew Haven40 MGD (million gallons per day)2022
MATTABASSETT DISTRICT COMCromwell35 MGD (million gallons per day)2022
BRIDGEPORT WESTSIDEBridgeport30 MGD (million gallons per day)2022
WATERBURY WPCFWaterbury27.05 MGD (million gallons per day)2022
STAMFORD WPCFStamford24 MGD (million gallons per day)2022
NORWALK WPCFNorwalk18 MGD (million gallons per day)2022
DANBURY WPCFDanbury15.5 MGD (million gallons per day)2022
GREENWICH WPCFGreenwich12.5 MGD (million gallons per day)2022
EAST HARTFORD WPCFEast Hartford12.5 MGD (million gallons per day)2022
WEST HAVEN WPCFWest Haven12.5 MGD (million gallons per day)2022
BRIDGEPORT EAST SIDEBridgeport12 MGD (million gallons per day)2022
MERIDEN WPCFMeriden11.6 MGD (million gallons per day)2022
STRATFORD WPCFStratford11.5 MGD (million gallons per day)2022
BRISTOL STPBristol10.75 MGD (million gallons per day)2022
NAUGATUCK WPCFNaugatuck10.3 MGD (million gallons per day)2022
ENFIELD WWTFEnfield10 MGD (million gallons per day)2022
NEW LONDON WPCFNew London10 MGD (million gallons per day)2022
FAIRFIELD WPCFFairfield9 MGD (million gallons per day)2022
NORWICH WPCFNorwich8.5 MGD (million gallons per day)2022
MANCHESTER WPCFManchester8.2 MGD (million gallons per day)2022
MILFORD - HOUSATONIC WPCFMilford8.2 MGD (million gallons per day)2022
KILLINGLY WPCFDanielson8 MGD (million gallons per day)2022
WALLINGFORD WPCFWallingford8 MGD (million gallons per day)2022
GROTON WPCFGroton7.5 MGD (million gallons per day)2022
ROCKY HILL WPCFRocky Hill7.5 MGD (million gallons per day)2022
SOUTHINGTON WPCFPlantsville7.4 MGD (million gallons per day)2022
VERNON WPCFTolland7.1 MGD (million gallons per day)2022
TORRINGTON MAIN WPCFTorrington7 MGD (million gallons per day)2022
FARMINGTON WPCFFarmington5.65 MGD (million gallons per day)2022
WINDHAM, TOWN OFWillimantic5.5 MGD (million gallons per day)2022
WILLIMANTIC, TOWN OFWillimantic5.5 MGD (million gallons per day)2022
WINDSOR POQUONOCK STPWindsor5 MGD (million gallons per day)2022
BRANFORD WPCFBranford4.9 MGD (million gallons per day)2022
MONTVILLE WPCFUncasville4.5 MGD (million gallons per day)2022
NORTH HAVEN WPCFNorth Haven4.5 MGD (million gallons per day)2022
SHELTON WPCFShelton4 MGD (million gallons per day)2022
EAST HAMPTON WPCFEast Hampton3.9 MGD (million gallons per day)2022
PLAINVILLE WPCFPlainville3.8 MGD (million gallons per day)2022
SIMSBURY WPCFSimsbury3.8 MGD (million gallons per day)2022
SOUTH WINDSOR WPCFSouth Windsor3.75 MGD (million gallons per day)2022
GLASTONBURY WPCFGlastonbury3.64 MGD (million gallons per day)2022
ANSONIA WPCFAnsonia3.5 MGD (million gallons per day)2022
CHESHIRE WPCFCheshire3.5 MGD (million gallons per day)2022
WINSTED WPCFWinsted3.5 MGD (million gallons per day)2022
WESTPORT WPCFWestport3.3 MGD (million gallons per day)2022
GROTON CITY WPCFGroton3.1 MGD (million gallons per day)2022
DERBY WPCFDerby3.03 MGD (million gallons per day)2022
UNIVERSITY OF CONN WPCFStorrs Mansfield3 MGD (million gallons per day)2022
SEYMOUR WPCFSeymour2.93 MGD (million gallons per day)2022
PUTNAM W P C FPutnam2.91 MGD (million gallons per day)2022
E WINDSOR WAREHOUSE PT.East Windsor2.5 MGD (million gallons per day)2022
BEAVERBROOK WPCFMilford2.25 MGD (million gallons per day)2022
WINDSOR LOCKS WPCFWindsor Locks2.12 MGD (million gallons per day)2022
SUFFIELD WPCFSuffield2.02 MGD (million gallons per day)2022
NEW MILFORD WPCFNew Milford2 MGD (million gallons per day)2022
STAFFORD WPCFStafford Springs2 MGD (million gallons per day)2022
PLYMOUTH WPCFPequabuck1.75 MGD (million gallons per day)2022
NEW CANAAN WPCFNew Canaan1.7 MGD (million gallons per day)2022
THOMASTON, TOWN OFThomaston1.38 MGD (million gallons per day)2022
THOMPSON, TOWN OFThompson1.35 MGD (million gallons per day)2022
STONINGTON PAWCATUCK WPCFPawcatuck1.3 MGD (million gallons per day)2022
PORTLAND, TOWN OFPortland1.2 MGD (million gallons per day)2022
JEWETT CITY WPCFJewett City1.1 MGD (million gallons per day)2022
PLAINFIELD NORTH WPCFCentral Village1.08 MGD (million gallons per day)2022
RIDGEFIELD WPCFRidgefield1 MGD (million gallons per day)2022
NEWTOWN WPCFNewtown0.932 MGD (million gallons per day)2022
LITCHFIELD WPCFBantam0.8 MGD (million gallons per day)2022
STONINGTON-MYSTIC WPCFMystic0.8 MGD (million gallons per day)2022
PLAINFIELD VILLAGE WPCFPlainfield0.707 MGD (million gallons per day)2022
SALISBURY, TOWN OFSalisbury0.67 MGD (million gallons per day)2022
STONINGTON BOROUGH WPCFStonington0.66 MGD (million gallons per day)2022
CANTON WPCFCanton0.646 MGD (million gallons per day)2022
BEACON FALLS WPCFBeacon Falls0.5 MGD (million gallons per day)2022
NEW HARTFORD, TOWN OFNew Hartford0.4 MGD (million gallons per day)2022
CANAAN FIRE DISTRICT WPCFCanaan0.4 MGD (million gallons per day)2022
SPRAGUE WPCFBaltic0.4 MGD (million gallons per day)2022
NORFOLK, TOWN OFNorfolk0.35 MGD (million gallons per day)2022
Quinebaug Fish HatcheryPlainfield0.3 MGD (million gallons per day)2022
Burlington Fish HatcheryBurlington0.264 MGD (million gallons per day)2022
LEDYARD HIGHLANDS WPCFLedyard0.26 MGD (million gallons per day)2022
REDDING - GEORGETOWN WPCFRedding0.245 MGD (million gallons per day)2022
DEEP RIVER, TOWN OFDeep River0.22 MGD (million gallons per day)2022
COVENTRY WPCFCoventry0.2 MGD (million gallons per day)2022
KENT, TOWN OFKent0.142 MGD (million gallons per day)2022
SHARON, TOWN OFSharon0.113 MGD (million gallons per day)2022
GOSHEN, TOWN OF - Woodridge Lake Sewer DistGoshen0.1 MGD (million gallons per day)2022
SOMERS WPCASomers0.097 MGD (million gallons per day)2022
E HADDAM, TOWN OFEast Haddam0.055 MGD (million gallons per day)2022
CHESTER, TOWN OFChester0.01 MGD (million gallons per day)2022
GLASGO COMMUNITY WTPVoluntown0.01 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.