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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
Marshall WWTPMarshall8 MGD (million gallons per day)2022
Intercontinental Airport WWTPHouston8 MGD (million gallons per day)2022
San Marcos Southeast WWTPSan Marcos8 MGD (million gallons per day)2022
MARTINSVILLE STPRidgeway8 MGD (million gallons per day)2022
LITTLE FALLS RUN STPFredericksburg8 MGD (million gallons per day)2022
CLARKSBURG WWTPClarksburg8 MGD (million gallons per day)2022
BECKLEY WWTPBeckley8 MGD (million gallons per day)2022
Urbana & Champaign Southwest STPChampaign7.98 MGD (million gallons per day)2022
RIVERBANK WWTFRiverbank7.9 MGD (million gallons per day)2022
WAILUKU-KAHULUI WWTFKahului7.9 MGD (million gallons per day)2022
Roseburg Urban Sanitary AuthorityRoseburg7.9 MGD (million gallons per day)2022
Sugar Land North WWTPSugar Land7.9 MGD (million gallons per day)2022
Westborough Sewerage Collection System and WWTFWestborough7.89 MGD (million gallons per day)2022
West Warwick WWTFWest Warwick7.89 MGD (million gallons per day)2022
SHARON CITY STPSharon7.8 MGD (million gallons per day)2022
FRWRD North WRFElgin7.75 MGD (million gallons per day)2022
HCW&SWMA - GULFPORT POTW, NORTHGulfport7.75 MGD (million gallons per day)2022
INDIANA BORO STPIndiana7.75 MGD (million gallons per day)2022
Coral Springs STPCortez7.72 MGD (million gallons per day)2022
South Tahoe WWTFSouth Lake Tahoe7.7 MGD (million gallons per day)2022
Joliet, Aux Sable Creek Basin WWTPJoliet7.7 MGD (million gallons per day)2022
WARWICK WWTFWarwick7.7 MGD (million gallons per day)2022
Erie (Co) SD#2 WWTP at Big SisterAngola7.68 MGD (million gallons per day)2022
Spokane County Regional WWTPSpokane7.68 MGD (million gallons per day)2022
CMCMUA - Seven Mile/Middle - STP/SludgeCape May7.67 MGD (million gallons per day)2022
WEST CHICAGO STPWest Chicago7.64 MGD (million gallons per day)2022
ALABASTER WWTPAlabaster7.6 MGD (million gallons per day)2022
St. Cloud Southside #2 WWTPKissimmee7.6 MGD (million gallons per day)2022
Fremont WPCC & Sewer SystemFremont7.6 MGD (million gallons per day)2022
SUPERIOR WWTPSuperior7.6 MGD (million gallons per day)2022
JACKSONVILLE STPJacksonville7.57 MGD (million gallons per day)2022
La Porte Main Plant WWTPLa Porte7.56 MGD (million gallons per day)2022
St. Chas MO River STPSaint Charles7.54 MGD (million gallons per day)2022
WILLMAR WWTPWillmar7.51 MGD (million gallons per day)2022
MEADVILLE STPMeadville7.501 MGD (million gallons per day)2022
OCWD Green Acres Project (GAP)Fountain Valley7.5 MGD (million gallons per day)2022
North of River Sanitary DistrictShafter7.5 MGD (million gallons per day)2022
Davis, City of WWTPDavis7.5 MGD (million gallons per day)2022
Irvine Ranch Water District (Los Alisos WRP)Lake Forest7.5 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
Gainesville Main St WWTFGainesville7.5 MGD (million gallons per day)2022
Orlando/Conserv I WWTFOrlando7.5 MGD (million gallons per day)2022
OCUD/Northwest WRFApopka7.5 MGD (million gallons per day)2022
NEW PORT RICHEY WPCPNew Port Richey7.5 MGD (million gallons per day)2022
WINTER HAVEN WWTP#3Winter Haven7.5 MGD (million gallons per day)2022
Manatee County North Regional WWTPPalmetto7.5 MGD (million gallons per day)2022
KIHEI WWTFKihei7.5 MGD (million gallons per day)2022
Bloomington-Normal Southeast (New)Heyworth7.5 MGD (million gallons per day)2022
Plainfield WWTP & Collection SystemPlainfield7.5 MGD (million gallons per day)2022
ROMEOVILLE WWTP & COLLECTION SYSTEMRomeoville7.5 MGD (million gallons per day)2022
SPEEDWAY, TOWN OFSpeedway7.5 MGD (million gallons per day)2022
VINCENNES WWTPVincennes7.5 MGD (million gallons per day)2022
MSD - CEDAR CREEK STPLouisville7.5 MGD (million gallons per day)2022
PATUXENT WWTPCrofton7.5 MGD (million gallons per day)2022
PARKWAY STPLaurel7.5 MGD (million gallons per day)2022
PRBRSA-Two Bridges SA CS/STPLincoln Park7.5 MGD (million gallons per day)2022
Ocean Township (Monmouth) SA - CS/STPOakhurst7.5 MGD (million gallons per day)2022
Webster (V) WWTPWebster7.5 MGD (million gallons per day)2022
LAKE RHODISS WWTPValdese7.5 MGD (million gallons per day)2022
NORTH HARNETT (LILLINGTON) REG. WWTPLillington7.5 MGD (million gallons per day)2022
Rocky River WWTPMooresville7.5 MGD (million gallons per day)2022
REIDSVILLE WWTPReidsville7.5 MGD (million gallons per day)2022
BISMARCK WASTEWATERBismarck7.5 MGD (million gallons per day)2022
Alliance WWTP & SewersAlliance7.5 MGD (million gallons per day)2022
Wooster WWTP & Sewer SystemWooster7.5 MGD (million gallons per day)2022
HILLSBORO WESTSIDE STPHillsboro7.5 MGD (million gallons per day)2022
Lancaster/Catawba RiverLancaster7.5 MGD (million gallons per day)2022
PELHAM WWTPGreer7.5 MGD (million gallons per day)2022
MORRISTOWN WWTPMorristown7.5 MGD (million gallons per day)2022
Eastern La Joya WWTPLa Joya7.5 MGD (million gallons per day)2022
DOSHIER FARMS WWTPTemple7.5 MGD (million gallons per day)2022
Sugar Land South WWTPSugar Land7.5 MGD (million gallons per day)2022
Dallas - Salmon Central WWTPLeague City7.5 MGD (million gallons per day)2022
LEESBURG SAN SEWER SYSTEMLeesburg7.5 MGD (million gallons per day)2022
OTHELLO SEWAGE LAGOONSOthello7.5 MGD (million gallons per day)2022
SOUTHINGTON WPCFPlantsville7.4 MGD (million gallons per day)2022
LYNNWOOD TREATMENT SYSTEMEdmonds7.4 MGD (million gallons per day)2022
Russellville WWTPRussellville7.3 MGD (million gallons per day)2022
Sanford North WRFSanford7.3 MGD (million gallons per day)2022
FT MADISON WWTPFort Madison7.29 MGD (million gallons per day)2022
CAMARILLO Water Reclamation PlantCamarillo7.25 MGD (million gallons per day)2022
SALINA WWTP NO 1Salina7.25 MGD (million gallons per day)2022
Central WWTPPflugerville7.25 MGD (million gallons per day)2022
Paris WWTPParis7.25 MGD (million gallons per day)2022
Northeast WWTP - HoustonHouston7.25 MGD (million gallons per day)2022
BRIDGE CITY OLD PLANTWestwego7.23 MGD (million gallons per day)2022
Delano WWTFDelano7.2 MGD (million gallons per day)2022
DODGE CITY WWTPDodge City7.2 MGD (million gallons per day)2022
WINCHESTER STRODES CK WWTPWinchester7.2 MGD (million gallons per day)2022
Shoal Creek FacilityJoplin7.2 MGD (million gallons per day)2022
Clermont Co Middle East Fork WWTPBatavia7.2 MGD (million gallons per day)2022
Harris Co WCID # 111 WWTPHouston7.2 MGD (million gallons per day)2022
Fort Stewart WPCFFort Stewart7.15 MGD (million gallons per day)2022
DOWNINGTOWN AREA STPDowningtown7.134 MGD (million gallons per day)2022
DOTHAN OMMUSSEE CREEK WWTPDothan7.12 MGD (million gallons per day)2022
VERNON WPCFTolland7.1 MGD (million gallons per day)2022
Amherst Sewerage Collection System and WWTFHadley7.1 MGD (million gallons per day)2022
Leominster Sewerage Collection System and WWTFLeominster7.1 MGD (million gallons per day)2022
Marshall WWTPMarshall7.1 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.