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

Wastewater treatment plants in the United States

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All countries

17,009 inventory records · EPA Clean Watersheds Needs Survey 2022

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

States

17,009 results

CompareNameNative sizeYear
MWRDGC, Stickney Treatment PlantCicero1,200 MGD (million gallons per day)2022
GLWA WRRFDetroit930 MGD (million gallons per day)2022
NEORSD Southerly WWTPLockbourne525 MGD (million gallons per day)2022
Hyperion WRPPlaya Del Rey450 MGD (million gallons per day)2022
LACSD (Joint Water Pollution Control Plant)Carson400 MGD (million gallons per day)2022
BLUE PLAINS STPWashington370 MGD (million gallons per day)2022
Passaic Valley Sewerage Commission - CS/CSO/STPNewark368 MGD (million gallons per day)2022
NEORSD Easterly WWTPCleveland355 MGD (million gallons per day)2022
MWRDGC, CALUMET WRP, MWRDGCChicago354 MGD (million gallons per day)2022
Lemay WWTPSaint Louis350 MGD (million gallons per day)2022
MWRDGC, NORTHSIDE (Terrence O'Brien) WRPSkokie333 MGD (million gallons per day)2022
MWRA Deer Island WWTFBoston310 MGD (million gallons per day)2022
New York (C) - Newtown Creek WPCPNew York310 MGD (million gallons per day)2022
MILWAUKEE MSD COMBINED - Jones IslandMilwaukee300 MGD (million gallons per day)2022
New York (C) - Wards Island WPCPNew York275 MGD (million gallons per day)2022
MILWAUKEE MSD COMBINED - South ShoreSouth Milwaukee265 MGD (million gallons per day)2022
METROPOLITAN WWTPSaint Paul251 MGD (million gallons per day)2022
ALCOSAN STP (ALLEGHENY COUNTY)Pittsburgh250 MGD (million gallons per day)2022
Metro Wastewater Reclamation DistrictDenver248.8 MGD (million gallons per day)2022
City of IndianapolisIndianapolis245 MGD (million gallons per day)2022
Point Loma WRPSan Diego240 MGD (million gallons per day)2022
Phoenix 91st Ave WWTPPhoenix230 MGD (million gallons per day)2022
MSD Mill Creek Drainage BasinCincinnati220.9 MGD (million gallons per day)2022
WEST POINT WWTPSeattle215 MGD (million gallons per day)2022
PHILADELPHIA WATER DEPT (NE)Philadelphia210 MGD (million gallons per day)2022
New York (C) - Hunts Point WPCPBronx200 MGD (million gallons per day)2022
PHILADELPHIA WATER DEPT (SW)Philadelphia200 MGD (million gallons per day)2022
69th Street PlantHouston200 MGD (million gallons per day)2022
OCSD WRP No. 1Fountain Valley182 MGD (million gallons per day)2022
BACK RIVER WWTPBaltimore180 MGD (million gallons per day)2022
Buffalo Sewer Authority Bird Island STPBuffalo180 MGD (million gallons per day)2022
Central WWTP - TRADallas175.2 MGD (million gallons per day)2022
New York (C) - North River WPCPNew York170 MGD (million gallons per day)2022
San Jose/Santa Clara WPCPSan Jose167 MGD (million gallons per day)2022
Village Creek Water Reuse FacilityArlington166 MGD (million gallons per day)2022
Oakport WWFOakland158 MGD (million gallons per day)2022
Austin 5 Year CIP - Citywide WastewaterAustin151.89 MGD (million gallons per day)2022
OCSD WWTP No. 2Huntington Beach150 MGD (million gallons per day)2022
New York (C) - Bowery Bay WPCPAstoria150 MGD (million gallons per day)2022
Middlesex County UA - CS/STPSayreville147 MGD (million gallons per day)2022
Westchester (Co) Yonkers Joint STPYonkers145 MGD (million gallons per day)2022
MDWASD Central District WWTFMiami143 MGD (million gallons per day)2022
Chattanooga Moccasin Bend WWTPChattanooga140 MGD (million gallons per day)2022
RICHMOND WWTPRichmond140 MGD (million gallons per day)2022
Monroe (Co) Frank E Van Lare STPRochester135 MGD (million gallons per day)2022
Memphis N. Maynard C. Stiles STPMemphis135 MGD (million gallons per day)2022
DES MOINES METRO WRA WWTPDes Moines134 MGD (million gallons per day)2022
Bissell Point WWTPSaint Louis125.7 MGD (million gallons per day)2022
WYANDOTTE WWTPWyandotte125 MGD (million gallons per day)2022
Steven M Clouse Water Recycling CenterSan Antonio125 MGD (million gallons per day)2022
Dos Rios WWTPSan Antonio125 MGD (million gallons per day)2022
NEW ORLEANS EAST BANKNew Orleans122 MGD (million gallons per day)2022
King County South Treatment PlantRenton122 MGD (million gallons per day)2022
Central WWTP - DallasDallas120.1 MGD (million gallons per day)2022
East Bay MUD Main WWTPOakland120 MGD (million gallons per day)2022
MDWASD North District WWTPMiami120 MGD (million gallons per day)2022
MSD - MORRIS FORMAN STPLouisville120 MGD (million gallons per day)2022
New York (C) - Owls Head WPCPBrooklyn120 MGD (million gallons per day)2022
Sacramento Regional County Sanitation District (Sacramento Regional Treatment Plant)Elk Grove115 MGD (million gallons per day)2022
MDWASD South District WWTPMiami112.5 MGD (million gallons per day)2022
PHILADELPHIA WATER DEPT (SE)Philadelphia112 MGD (million gallons per day)2022
Columbus Southerly WWTP & SewersLockbourne111.879 MGD (million gallons per day)2022
New York (C) - Coney Island WPCPBrooklyn110 MGD (million gallons per day)2022
Southside WWTP - DallasDallas110 MGD (million gallons per day)2022
Bergen County UA-Little Ferry WPCF - CS/CSO/STPLittle Ferry109.04 MGD (million gallons per day)2022
WILMINGTON STPWilmington105 MGD (million gallons per day)2022
K.C. Blue River STPKansas City105 MGD (million gallons per day)2022
Toledo Bay View Park WWTP & SewersToledo102 MGD (million gallons per day)2022
OCWD Groundwater Replenishment System (GWRS)Fountain Valley100 MGD (million gallons per day)2022
Point Isabel WWFRichmond100 MGD (million gallons per day)2022
LACSD (San Jose Creek WRP)Whittier100 MGD (million gallons per day)2022
RM Clayton WRPAtlanta100 MGD (million gallons per day)2022
New York (C) - Jamaica WPCPJamaica100 MGD (million gallons per day)2022
COLUMBIA BLVD. STPPortland100 MGD (million gallons per day)2022
Nashville - Central WWTPNashville100 MGD (million gallons per day)2022
Howard F Curren AWTPTampa96 MGD (million gallons per day)2022
LAS VEGAS AWTLas Vegas91 MGD (million gallons per day)2022
SAND ISLAND WWTPHonolulu90 MGD (million gallons per day)2022
Akron WWTP & SewersAkron90 MGD (million gallons per day)2022
Memphis S. T. E. MAXSON WWTPMemphis90 MGD (million gallons per day)2022
Southeast WPCPSan Francisco85.4 MGD (million gallons per day)2022
Jefferson County-Valley Creek WWTPBessemer85 MGD (million gallons per day)2022
West Area WQCFAtlanta85 MGD (million gallons per day)2022
Joint Meeting of Essex & Union - CSO/STPElizabeth85 MGD (million gallons per day)2022
New York (C) - 26th. Ward WPCPBrooklyn85 MGD (million gallons per day)2022
BROWARD CNTY N. DIST REGPompano Beach84 MGD (million gallons per day)2022
Tillman WRPVan Nuys80 MGD (million gallons per day)2022
Camden County MUA - CS-CSO/WWTPCamden80 MGD (million gallons per day)2022
New York (C) - Tallman Island WPCPCollege Point80 MGD (million gallons per day)2022
Onondaga (Co) Metro Syracuse STPSyracuse80 MGD (million gallons per day)2022
OKC-NORTH CANADIAN WWTJones80 MGD (million gallons per day)2022
Colorado Springs Utilities LVSWWTPColorado Springs75 MGD (million gallons per day)2022
Walnut Creek WWTPAustin75 MGD (million gallons per day)2022
South Austin Regional WWTPDel Valle75 MGD (million gallons per day)2022
CENTRAL VALLEY WRFSalt Lake City75 MGD (million gallons per day)2022
HENRICO REGIONAL WWTPRichmond75 MGD (million gallons per day)2022
MSD Little Miami Drainage BasinCincinnati73.6 MGD (million gallons per day)2022
Patapsco WWTPBaltimore73 MGD (million gallons per day)2022
NCSD #3 - Cedar Creek STPWantagh72 MGD (million gallons per day)2022
Columbus Jackson Pike WWTP & SewersColumbus72 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.