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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
THIEF RIVER FALLS WWTPThief River Falls2.99 MGD (million gallons per day)2022
HAINES CITY PCFHaines City2.97 MGD (million gallons per day)2022
MORTON POTWMorton2.97 MGD (million gallons per day)2022
ST. JAMES WWTPSaint James2.96 MGD (million gallons per day)2022
Piedmont STPAxton2.96 MGD (million gallons per day)2022
PARIS WWTPParis2.95 MGD (million gallons per day)2022
Mustang Bayou Regional WWTPMissouri City2.95 MGD (million gallons per day)2022
NEWTON WWTPNewton2.94 MGD (million gallons per day)2022
SEYMOUR WPCFSeymour2.93 MGD (million gallons per day)2022
Fulton WWTPFulton2.93 MGD (million gallons per day)2022
BROADWAY STPTimberville2.93 MGD (million gallons per day)2022
Las Gallinas Valley Sanitary District Sewage Treatment PlantSan Rafael2.92 MGD (million gallons per day)2022
PUTNAM W P C FPutnam2.91 MGD (million gallons per day)2022
Southside WWTP - Mount PleasantHouston2.91 MGD (million gallons per day)2022
Fountain Hills SD Advanced Water Treatment Facility (AWTF)Fountain Hills2.9 MGD (million gallons per day)2022
Fountain Hills SD WWTPFountain Hills2.9 MGD (million gallons per day)2022
BOONVILLE WWTPBoonville2.9 MGD (million gallons per day)2022
Double Creek WWTPJacksonville2.9 MGD (million gallons per day)2022
Jackson Street WWTPOrange2.9 MGD (million gallons per day)2022
EVANSTON WWTPEvanston2.9 MGD (million gallons per day)2022
MENOMONIE WWTPMenomonie2.88 MGD (million gallons per day)2022
SOUTH SIOUX CITY WWTPSouth Sioux City2.845 MGD (million gallons per day)2022
Macon WWTPMacon2.84 MGD (million gallons per day)2022
MONROE STPMonroe2.84 MGD (million gallons per day)2022
Mt. Pleasant/Center Street PlantMount Pleasant2.82 MGD (million gallons per day)2022
LEWISTOWN BORO STPLewistown2.818 MGD (million gallons per day)2022
Green Valley American Gulch Water Reclamation Facility (Payson)Payson2.8 MGD (million gallons per day)2022
WINDSOR WWTPWindsor2.8 MGD (million gallons per day)2022
Baxley WPCPBaxley2.8 MGD (million gallons per day)2022
BOLINGBROOK STP# 3Bolingbrook2.8 MGD (million gallons per day)2022
CARY WWTPCary2.8 MGD (million gallons per day)2022
GREENCASTLE WWTPGreencastle2.8 MGD (million gallons per day)2022
STURGIS STPSturgis2.8 MGD (million gallons per day)2022
FERGUS FALLS WWTPFergus Falls2.8 MGD (million gallons per day)2022
Rocky Branch Creek WWTPKansas City2.8 MGD (million gallons per day)2022
Eureka WWTPEureka2.8 MGD (million gallons per day)2022
NORTH PLATTE WWTPNorth Platte2.8 MGD (million gallons per day)2022
Hudson (C) WWTP & Collection SystemHudson2.8 MGD (million gallons per day)2022
Canajoharie (V) STPCanajoharie2.8 MGD (million gallons per day)2022
Ravenna WWTP & Sewer SystemRavenna2.8 MGD (million gallons per day)2022
Snohomish Wastewater SystemSnohomish2.8 MGD (million gallons per day)2022
SUNNYSIDE POTWSunnyside2.8 MGD (million gallons per day)2022
STURGEON BAY STPSturgeon Bay2.8 MGD (million gallons per day)2022
Grass Valley WWTFGrass Valley2.78 MGD (million gallons per day)2022
Poughkeepsie (T) Tri-Munical WWTPPoughkeepsie2.78 MGD (million gallons per day)2022
Wappinger Falls (V) WWTP & San. SewersWappingers Falls2.78 MGD (million gallons per day)2022
Wappinger (T) Tri-Muni WWTP & Collection SystemPoughkeepsie2.775 MGD (million gallons per day)2022
Juneau-Douglas WWTFJuneau2.76 MGD (million gallons per day)2022
Wynne WWTPWynne2.76 MGD (million gallons per day)2022
Martin County Utilities North WWTFJensen Beach2.76 MGD (million gallons per day)2022
HAMPSHIRE WWTPHampshire2.76 MGD (million gallons per day)2022
SILVER LAKE STPDel Rio2.76 MGD (million gallons per day)2022
Lake Forest WWTPHouston2.76 MGD (million gallons per day)2022
FORT LUPTON WWTPFort Lupton2.75 MGD (million gallons per day)2022
TITUSVILLE NORTH PLANT Osprey WRFTitusville2.75 MGD (million gallons per day)2022
Edgewater WWTFEdgewater2.75 MGD (million gallons per day)2022
THREE RIVERS WWTPThree Rivers2.75 MGD (million gallons per day)2022
GENESEE COUNTY DIST. 3 WWTPLinden2.75 MGD (million gallons per day)2022
Farmington WWTP EastFarmington2.75 MGD (million gallons per day)2022
Lewiston (T) Master SD WWTP & SewersLewiston2.75 MGD (million gallons per day)2022
Clinton-Joanna WWTPJoanna2.75 MGD (million gallons per day)2022
BELLS LAGOONBells2.75 MGD (million gallons per day)2022
TAYLOR STPTaylor2.75 MGD (million gallons per day)2022
Port Acres WWTPPort Arthur2.75 MGD (million gallons per day)2022
CEDARBURG STPCedarburg2.75 MGD (million gallons per day)2022
COLUMBUS WWTPColumbus2.74 MGD (million gallons per day)2022
WIS DELLS-LAKE DELTON STPLake Delton2.73 MGD (million gallons per day)2022
HARTSELLE SHOAL CREEK WWTPHartselle2.7 MGD (million gallons per day)2022
EUFAULA WWTPEufaula2.7 MGD (million gallons per day)2022
FALLBROOK WWTF #1Fallbrook2.7 MGD (million gallons per day)2022
SALIDA WWTPSalida2.7 MGD (million gallons per day)2022
HUMBOLDT WWTPHumboldt2.7 MGD (million gallons per day)2022
RED OAK WWTPRed Oak2.7 MGD (million gallons per day)2022
PARIS STP & CSParis2.7 MGD (million gallons per day)2022
Erving Sewerage Collection System and WWTFsErving2.7 MGD (million gallons per day)2022
ALGONAC STPAlgonac2.7 MGD (million gallons per day)2022
Burlington City - CS/STPBurlington2.7 MGD (million gallons per day)2022
Los Lunas, Village ofLos Lunas2.7 MGD (million gallons per day)2022
Ruidoso WWTPRuidoso2.7 MGD (million gallons per day)2022
Canton (V) WWTPCanton2.7 MGD (million gallons per day)2022
Galion WWTP & Sewer SystemGalion2.7 MGD (million gallons per day)2022
UPPER GWYNEDD TWP STPNorth Wales2.7 MGD (million gallons per day)2022
CENTRALIA STPCentralia2.7 MGD (million gallons per day)2022
FERNDALE STPFerndale2.7 MGD (million gallons per day)2022
CHENEY S/T FACILITYCheney2.7 MGD (million gallons per day)2022
FORT ATKINSON STPFort Atkinson2.7 MGD (million gallons per day)2022
ROCK SPRINGS WWTPRock Springs2.7 MGD (million gallons per day)2022
Hollister Domestic WWTPHollister2.69 MGD (million gallons per day)2022
SALINE STPSaline2.69 MGD (million gallons per day)2022
Charcoal Point WWTPKetchikan2.68 MGD (million gallons per day)2022
STERLING WWTPSterling2.68 MGD (million gallons per day)2022
KENDALLVILLE WWTPKendallville2.68 MGD (million gallons per day)2022
OTTAWA WWTPOttawa2.68 MGD (million gallons per day)2022
MARYSVILLE STPMarysville2.67 MGD (million gallons per day)2022
PLAINVIEW - ELGIN STPPlainview2.67 MGD (million gallons per day)2022
DEMOPOLIS WWTPDemopolis2.65 MGD (million gallons per day)2022
ATLANTIC WWTPAtlantic2.65 MGD (million gallons per day)2022
RUMFORD-MEXICO S FMexico2.65 MGD (million gallons per day)2022
Southside WWTP - AliceAlice2.65 MGD (million gallons per day)2022
Oak Grove WWTPEnnis2.65 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.