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

Wastewater treatment plants in United States · Maine

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133 inventory records · EPA Clean Watersheds Needs Survey 2022

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

133 results

CompareNameNative sizeYear
PORTLAND EAST END WWTFPortland19.8 MGD (million gallons per day)2022
BANGOR POLL ABATE FACBangor18 MGD (million gallons per day)2022
LEWISTON-AUBURN W W T PLewiston14.2 MGD (million gallons per day)2022
SOUTH PORTLAND STPSouth Portland9.3 MGD (million gallons per day)2022
AUGUSTA SEWAGE TPAugusta8 MGD (million gallons per day)2022
KENNEBEC WWTPWaterville6 MGD (million gallons per day)2022
BREWER WASTEWATER TREATMENTBrewer5.19 MGD (million gallons per day)2022
ANSON-MADISON WWTFMadison5 MGD (million gallons per day)2022
WESTBROOK WWTFWestbrook4.54 MGD (million gallons per day)2022
GARDINER WPCFGardiner4.5 MGD (million gallons per day)2022
City of Saco Water Resource Recovery DivisionSaco4.2 MGD (million gallons per day)2022
BRUNSWICK STPBrunswick3.85 MGD (million gallons per day)2022
BATH WTPBath3.5 MGD (million gallons per day)2022
OLD ORCHARD BEACH W P C FOld Orchard Beach3.5 MGD (million gallons per day)2022
ROCKLAND WWTFRockland3.3 MGD (million gallons per day)2022
YORK W P ABATEMENT FACYork3 MGD (million gallons per day)2022
RUMFORD-MEXICO S FMexico2.65 MGD (million gallons per day)2022
PROUTS NECK W P C FScarborough2.56 MGD (million gallons per day)2022
SANFORD W W T FSanford2.5 MGD (million gallons per day)2022
KITTERY WPCFKittery2.4 MGD (million gallons per day)2022
MILLINOCKET WWTFMillinocket2.33 MGD (million gallons per day)2022
BIDDEFORD WWTPBiddeford2.31 MGD (million gallons per day)2022
PRESQUE ISLE WWTFPresque Isle2.31 MGD (million gallons per day)2022
LISBON W P C PLANTLisbon2.025 MGD (million gallons per day)2022
BAR HARBOR STPBar Harbor2 MGD (million gallons per day)2022
LINCOLN WWTFLincoln2 MGD (million gallons per day)2022
LIVERMORE FALLS WWTFLivermore Falls2 MGD (million gallons per day)2022
OGUNQUIT WWTFOgunquit2 MGD (million gallons per day)2022
Caribou Utility DistrictCaribou1.71 MGD (million gallons per day)2022
OLD TOWN WWTFOld Town1.7 MGD (million gallons per day)2022
SKOWHEGAN WWTFSkowhegan1.65 MGD (million gallons per day)2022
CAMDEN WPCFCamden1.59 MGD (million gallons per day)2022
CORINNA W P C FCorinna1.56 MGD (million gallons per day)2022
FALMOUTH WWTFFalmouth1.56 MGD (million gallons per day)2022
HARTLAND TREATMENT PLANTHartland1.5 MGD (million gallons per day)2022
HOULTON WPCFHoulton1.5 MGD (million gallons per day)2022
YARMOUTH WW T PYarmouth1.3 MGD (million gallons per day)2022
Pittsfield WWTFPittsfield1.25 MGD (million gallons per day)2022
Ellsworth WWTFEllsworth1.1 MGD (million gallons per day)2022
ORONO WWTPOrono1.07 MGD (million gallons per day)2022
BELFAST S T PBelfast1 MGD (million gallons per day)2022
WELLS WWTFWells1 MGD (million gallons per day)2022
GUILFORD-SANGERVILLE WWTFGuilford0.93 MGD (million gallons per day)2022
FARMINGTON WATER POLLUTIOFarmington0.9 MGD (million gallons per day)2022
MACHIAS WWTFMachias0.9 MGD (million gallons per day)2022
EASTPORT WWTFEastport0.82 MGD (million gallons per day)2022
DOVER-FOXCROFT POLLUTION ABATEMENT FACILITYDover Foxcroft0.8 MGD (million gallons per day)2022
KENNEBUNK STPKennebunk0.75 MGD (million gallons per day)2022
FREEPORT WWTFFreeport0.75 MGD (million gallons per day)2022
CALAIS WWTFCalais0.75 MGD (million gallons per day)2022
KENNEBUNKPORT WWTFKennebunkport0.705 MGD (million gallons per day)2022
MADAWASKA WWTFMadawaska0.674 MGD (million gallons per day)2022
EAST MILLINOCKET WWTFEast Millinocket0.65 MGD (million gallons per day)2022
PARIS UTILITY DIST W P CSouth Paris0.65 MGD (million gallons per day)2022
WISCASSET SEWAGE TREATMENTWiscasset0.62 MGD (million gallons per day)2022
WOODLAND WWTFBaileyville0.6 MGD (million gallons per day)2022
VAN BUREN SAFVan Buren0.56 MGD (million gallons per day)2022
S. CAPE ELIZABETH WWTFCape Elizabeth0.55 MGD (million gallons per day)2022
Newport WWTFNewport0.524 MGD (million gallons per day)2022
BUCKSPORT WWTPBucksport0.5 MGD (million gallons per day)2022
UNITY WWTFUnity0.5 MGD (million gallons per day)2022
MECHANIC FALLS WWTPMechanic Falls0.49 MGD (million gallons per day)2022
WILTON W P C FWilton0.45 MGD (million gallons per day)2022
Thomaston WPCFThomaston0.427 MGD (million gallons per day)2022
SW HARBOR POL ABATE FACSouthwest Harbor0.4 MGD (million gallons per day)2022
MILO WWTFMilo0.39 MGD (million gallons per day)2022
BOOTHBAY HARBOR WWTFBoothbay Harbor0.383 MGD (million gallons per day)2022
RANGELEY WWTFRangeley0.38 MGD (million gallons per day)2022
SO BERWICK SEWAGE PLANTSouth Berwick0.374 MGD (million gallons per day)2022
CLINTON WWTFClinton0.37 MGD (million gallons per day)2022
NORWAY S. T. P.Norway0.355 MGD (million gallons per day)2022
VEAZIE STPVeazie0.35 MGD (million gallons per day)2022
Greater LIMESTONE Regional WWTFLimestone0.35 MGD (million gallons per day)2022
BETHEL WWTFBethel0.34 MGD (million gallons per day)2022
NORTHEAST HARBOR STPNortheast Harbor0.33 MGD (million gallons per day)2022
RICHMOND WWTFRichmond0.32 MGD (million gallons per day)2022
FORT FAIRFIELD WWTFFort Fairfield0.302 MGD (million gallons per day)2022
BERWICK WPCFBerwick0.3 MGD (million gallons per day)2022
ASHLAND SEWAGE LAGOONSAshland0.3 MGD (million gallons per day)2022
DEXTER TREATMENT PLANTDexter0.28 MGD (million gallons per day)2022
FORT KENT WWTFFort Kent0.277 MGD (million gallons per day)2022
MARS HILL WWTPMars Hill0.27 MGD (million gallons per day)2022
GREAT SALT BAY WPCFDamariscotta0.268 MGD (million gallons per day)2022
SEAL HARBOR STPSeal Harbor0.25 MGD (million gallons per day)2022
OXFORD WPCFOxford0.25 MGD (million gallons per day)2022
CARRABASSETT TPCarrabassett Valley0.25 MGD (million gallons per day)2022
PEAKS ISLAND STPPortland0.2 MGD (million gallons per day)2022
WINTERPORT WWTFWinterport0.2 MGD (million gallons per day)2022
SEARSPORT WWTFSearsport0.2 MGD (million gallons per day)2022
BINGHAM SEWAGE TREATMENTBingham0.2 MGD (million gallons per day)2022
NORRIDGEWOCK WWTFNorridgewock0.19 MGD (million gallons per day)2022
WARREN WWTFWarren0.19 MGD (million gallons per day)2022
STONINGTON WPCFStonington0.175 MGD (million gallons per day)2022
GREENVILLE WWTFGreenville0.17 MGD (million gallons per day)2022
LUBEC WWTPLubec0.166 MGD (million gallons per day)2022
WALDOBORO TREATMENT PLANTWaldoboro0.16 MGD (million gallons per day)2022
HOWLAND TREATMENT PLANTHowland0.155 MGD (million gallons per day)2022
WASHBURN STPWashburn0.152 MGD (million gallons per day)2022
HULLS COVE STPBar Harbor0.15 MGD (million gallons per day)2022
EAGLE LAKE WW TFEagle Lake0.14 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.