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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
Four Rivers Sanitation AuthorityRockford40 MGD (million gallons per day)2022
Coldwater Creek WWTPFlorissant40 MGD (million gallons per day)2022
Rahway Valley SA - CS/CSO/STPRahway40 MGD (million gallons per day)2022
Atlantic County UA WWTF CS/STPAtlantic City40 MGD (million gallons per day)2022
New York (C) - Oakwood Beach WPCPStaten Island40 MGD (million gallons per day)2022
BUNCOMBE COUNTY MSD WWTPAsheville40 MGD (million gallons per day)2022
T.Z. OSBOURNE WWTPMc Leansville40 MGD (million gallons per day)2022
NEORSD Westerly WWTPCleveland40 MGD (million gallons per day)2022
LEHIGH CO A - ALLENTOWNAllentown40 MGD (million gallons per day)2022
VIRGINIA INITIATIVE PLANTNorfolk40 MGD (million gallons per day)2022
ARLINGTON CO WPCPArlington40 MGD (million gallons per day)2022
ROCK CREEK STPHillsboro39.05 MGD (million gallons per day)2022
Palo Alto Regional WQCPPalo Alto39 MGD (million gallons per day)2022
Canton WWTP & Sewer SystemCanton39 MGD (million gallons per day)2022
HONOULIULI WWTPEwa Beach38 MGD (million gallons per day)2022
SENECA TREATMENT WWTFSouth Saint Paul38 MGD (million gallons per day)2022
Missouri River WWTPSaint Louis38 MGD (million gallons per day)2022
LACSD (Los Coyotes WRP)Cerritos37.5 MGD (million gallons per day)2022
Nashville - White's Creek WWTPNashville37.5 MGD (million gallons per day)2022
PEORIA STPPeoria37 MGD (million gallons per day)2022
DECATUR DRY CREEK WWTPDecatur36 MGD (million gallons per day)2022
Little Rock - Adams Field WWTPLittle Rock36 MGD (million gallons per day)2022
WARREN WWTPWarren36 MGD (million gallons per day)2022
PLUM ISLAND TRTMT PLANTCharleston36 MGD (million gallons per day)2022
RACINE STPRacine36 MGD (million gallons per day)2022
PCRWRD - Agua Nueva WRFTucson35.2 MGD (million gallons per day)2022
MONTGOMERY CATOMA CREEK WWTPMontgomery35 MGD (million gallons per day)2022
MATTABASSETT DISTRICT COMCromwell35 MGD (million gallons per day)2022
Palm Beach County Southern Region Water Reclamation FacilityBoynton Beach35 MGD (million gallons per day)2022
LANSING WWTPLansing35 MGD (million gallons per day)2022
Albany (Co) - ACSD North STPAlbany35 MGD (million gallons per day)2022
Binghamton-Johnson City Jt.S Bd.STPVestal35 MGD (million gallons per day)2022
Youngstown WWTP & Sewer SystemYoungstown35 MGD (million gallons per day)2022
SALEM WILLOW LAKE STPKeizer35 MGD (million gallons per day)2022
MCMINNVILLE WWTPMcminnville35 MGD (million gallons per day)2022
South Cross Bayou AWRFSaint Petersburg34 MGD (million gallons per day)2022
Manchester WWTFManchester34 MGD (million gallons per day)2022
NORTH DAVIS SDSyracuse34 MGD (million gallons per day)2022
LFUCG W HICKMAN STPNicholasville33.87 MGD (million gallons per day)2022
EAST BANK PLANTNew Orleans33.46 MGD (million gallons per day)2022
Union Sanitary District (Alvarado WWTF)Union City33 MGD (million gallons per day)2022
San Bernardino WRPSan Bernardino33 MGD (million gallons per day)2022
LANCASTER CITY STPLancaster32.08 MGD (million gallons per day)2022
North City WRPSan Diego32 MGD (million gallons per day)2022
Albany Joshua Road WPCPAlbany32 MGD (million gallons per day)2022
Sangamon Co. WRD SPRING CREEK WWTPSpringfield32 MGD (million gallons per day)2022
Lowell Sewerage Collection System and WWTFLowell32 MGD (million gallons per day)2022
SAGINAW STPSaginaw32 MGD (million gallons per day)2022
Hillebrandt WWTPBeaumont31.9 MGD (million gallons per day)2022
Oxnard WWTPOxnard31.7 MGD (million gallons per day)2022
Westside Treatment FacilityVancouver31.46 MGD (million gallons per day)2022
Everett WWTPEverett31.3 MGD (million gallons per day)2022
SHREVEPORT, LUCAS WWTPShreveport31.25 MGD (million gallons per day)2022
Lakewood WWTP & Sewer SystemLakewood31 MGD (million gallons per day)2022
Fall River Sewerage Collection System and WWTFFall River30.9 MGD (million gallons per day)2022
Suffolk (Co) SCSD #3 SouthwestWest Babylon30.5 MGD (million gallons per day)2022
Jefferson County-Five Mile WWTPFultondale30 MGD (million gallons per day)2022
Mesa Greenfield WRPGilbert30 MGD (million gallons per day)2022
Terminal Island WRPSan Pedro30 MGD (million gallons per day)2022
Perris Valley Regional WRFPerris30 MGD (million gallons per day)2022
BRIDGEPORT WESTSIDEBridgeport30 MGD (million gallons per day)2022
Northwest AWTPTampa30 MGD (million gallons per day)2022
MWRDGC, JOHN E EGAN WRPSchaumburg30 MGD (million gallons per day)2022
LFUCG TOWN BRANCH STPLexington30 MGD (million gallons per day)2022
MSD - DEREK R GUTHRIE WWTPLouisville30 MGD (million gallons per day)2022
BATON ROUGE SOUTH WWTPBaton Rouge30 MGD (million gallons per day)2022
WESTERN BRANCH WWTPUpper Marlboro30 MGD (million gallons per day)2022
PISCATAWAY WWTPAccokeek30 MGD (million gallons per day)2022
New Bedford Sewerage Collection System and WPCFNew Bedford30 MGD (million gallons per day)2022
Tonawanda (T) WWTPTonawanda30 MGD (million gallons per day)2022
ST HELENS STPPortland30 MGD (million gallons per day)2022
SOUTHEAST WRPLubbock30 MGD (million gallons per day)2022
Duck Creek WWTPSunnyvale30 MGD (million gallons per day)2022
TIMPANOGOS SSDAmerican Fork30 MGD (million gallons per day)2022
NANSEMOND W P C FSuffolk30 MGD (million gallons per day)2022
BELLINGHAM POST POINT TPBellingham30 MGD (million gallons per day)2022
South Essex Sewer District WWTPSalem29.71 MGD (million gallons per day)2022
Monterey One Water (Regional WWTP and Advanced Water Purification Facility)Marina29.6 MGD (million gallons per day)2022
SIOUX CITY WWTPSioux City29.6 MGD (million gallons per day)2022
Sunnyvale, City of (WPCP)Sunnyvale29.5 MGD (million gallons per day)2022
ANN ARBOR WWTPAnn Arbor29.5 MGD (million gallons per day)2022
Haskell St WWTPEl Paso29.28 MGD (million gallons per day)2022
THERESA STREET STPLincoln29.1 MGD (million gallons per day)2022
Silicon Valley Clean WaterRedwood City29 MGD (million gallons per day)2022
S BAYSIDE WWTPRedwood City29 MGD (million gallons per day)2022
Rockland County SD#1-Sloats/W.RamapOrangeburg29 MGD (million gallons per day)2022
MAULDIN RD PLANTGreenville29 MGD (million gallons per day)2022
Rockland County (Co) SD#1 & WWTPOrangeburg28.9 MGD (million gallons per day)2022
EMPIRE WWTPFarmington28.61 MGD (million gallons per day)2022
Macon Rocky Creek WPCPMacon28.6 MGD (million gallons per day)2022
KENOSHA - WWTPKenosha28.6 MGD (million gallons per day)2022
MAWSS – CC Williams WWTPMobile28 MGD (million gallons per day)2022
Michelson WRPIrvine28 MGD (million gallons per day)2022
KCK WWTP #1-KP WWTPKansas City28 MGD (million gallons per day)2022
Ocean County UA Northern WPCF - CS/STPBrick28 MGD (million gallons per day)2022
Ocean County UA Central WPCF - CS/STPBayville28 MGD (million gallons per day)2022
WATERBURY WPCFWaterbury27.05 MGD (million gallons per day)2022
Chandler Airport WRFChandler27 MGD (million gallons per day)2022
President Street WRPSavannah27 MGD (million gallons per day)2022
SAUGET - AMERICAN BOTTOMS REG. STPEast Saint Louis27 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.