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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
OPELOUSAS STPOpelousas3.4 MGD (million gallons per day)2022
Greenfield Sewerage Collection System and WPCFGreenfield3.4 MGD (million gallons per day)2022
Newburyport Sewerage Collection System and WPCFNewburyport3.4 MGD (million gallons per day)2022
GOGEBIC-IRON WWA STPIronwood3.4 MGD (million gallons per day)2022
Todd Creek WWTPKansas City3.4 MGD (million gallons per day)2022
Cooper Creek WWTPBranson3.4 MGD (million gallons per day)2022
Maple Shade Township - STP/CSMaple Shade3.4 MGD (million gallons per day)2022
Fulton (C) WWTPFulton3.4 MGD (million gallons per day)2022
SPRINGFIELD STPSpringfield3.4 MGD (million gallons per day)2022
Plainview WWTPPlainview3.4 MGD (million gallons per day)2022
MARION WWTP & COLL. SYS.Marion3.4 MGD (million gallons per day)2022
MONROE WWTPMonroe3.4 MGD (million gallons per day)2022
North Attleborough Sewerage Collection System and WWTFNorth Attleboro3.39 MGD (million gallons per day)2022
Stewart Creek WWTP - The ColonyThe Colony3.39 MGD (million gallons per day)2022
Havre de Grace WWTPHavre De Grace3.36 MGD (million gallons per day)2022
Niceville-Valparaiso Regional WWTPNiceville3.35 MGD (million gallons per day)2022
Niceville-Valparaiso Regional WWTFNiceville3.35 MGD (million gallons per day)2022
SALMON SEWAGE LAGOONSalmon3.35 MGD (million gallons per day)2022
East Windsor Township - CS/STPHightstown3.35 MGD (million gallons per day)2022
DUNCAN PUA WWTDuncan3.35 MGD (million gallons per day)2022
Fayetteville WWTPFayetteville3.35 MGD (million gallons per day)2022
ASH CREEK SIDHurricane3.35 MGD (million gallons per day)2022
WOODBURN POTWWoodburn3.33 MGD (million gallons per day)2022
Yuma Desert Dunes WRFYuma3.3 MGD (million gallons per day)2022
WESTPORT WPCFWestport3.3 MGD (million gallons per day)2022
CHARLESTON WWTPCharleston3.3 MGD (million gallons per day)2022
SALT CREEK S.D. WWTFVilla Park3.3 MGD (million gallons per day)2022
LaSalle South WWTPLa Salle3.3 MGD (million gallons per day)2022
WEBSTER CITY WASTEWATERWebster City3.3 MGD (million gallons per day)2022
LAWRENCEBURG WWTPLawrenceburg3.3 MGD (million gallons per day)2022
NATCHITOCHES STPNatchitoches3.3 MGD (million gallons per day)2022
ROCKLAND WWTFRockland3.3 MGD (million gallons per day)2022
Bowie Belair WWTPBowie3.3 MGD (million gallons per day)2022
IRON MT-KINGSFORD WWTPKingsford3.3 MGD (million gallons per day)2022
Morris Township - Butterworth CS/STPMorristown3.3 MGD (million gallons per day)2022
Malone (V) STPMalone3.3 MGD (million gallons per day)2022
Fredonia (V) WWTPDunkirk3.3 MGD (million gallons per day)2022
North Royalton WW District ANorth Royalton3.3 MGD (million gallons per day)2022
ELLWOOD CITY BORO STPEllwood City3.3 MGD (million gallons per day)2022
Lumberton MUD WWTP # 2Lumberton3.3 MGD (million gallons per day)2022
Southwest WWTP - HumbleHumble3.3 MGD (million gallons per day)2022
Essex Junction City WWTFEssex Junction3.3 MGD (million gallons per day)2022
Airport Parkway WWTFSouth Burlington3.3 MGD (million gallons per day)2022
DURANGO WWTPDurango3.28 MGD (million gallons per day)2022
Sussex County MUA - Upper Wallkill CS/STPLafayette3.265 MGD (million gallons per day)2022
Warner Robins (Ocmulgee River)Warner Robins3.26 MGD (million gallons per day)2022
Fallsburg (T) - South Fallsburg STPSouth Fallsburg3.26 MGD (million gallons per day)2022
Osceola WWTPOsceola3.25 MGD (million gallons per day)2022
DECATUR WWTPDecatur3.25 MGD (million gallons per day)2022
Sewer District #300 (Hinckley)Hinckley3.25 MGD (million gallons per day)2022
SALLISAW WWTSallisaw3.25 MGD (million gallons per day)2022
ADA WWTAda3.24 MGD (million gallons per day)2022
Delafield-Hartland WPCCDelafield3.23 MGD (million gallons per day)2022
Grovetown WPCPGrovetown3.225 MGD (million gallons per day)2022
Berkeley Heights Township - CS/STPBerkeley Heights3.225 MGD (million gallons per day)2022
DANVILLE BORO STPDanville3.22 MGD (million gallons per day)2022
West Escambia Sewer Authority WWTPAtmore3.2 MGD (million gallons per day)2022
Buckeye Sundance WRFBuckeye3.2 MGD (million gallons per day)2022
Surprise SPA2 WRFSurprise3.2 MGD (million gallons per day)2022
MOUNTAIN VIEW WWTFMartinez3.2 MGD (million gallons per day)2022
SNOWMASS W&SP WWTPSnowmass Village3.2 MGD (million gallons per day)2022
AVON WWTFAvon3.2 MGD (million gallons per day)2022
Rockmart WPCPRockmart3.2 MGD (million gallons per day)2022
ITASCA WWTP - PROSPECT AVEItasca3.2 MGD (million gallons per day)2022
ADDISON WWTP SOUTHAddison3.2 MGD (million gallons per day)2022
OLATHE MILL CREEK WWTPOlathe3.2 MGD (million gallons per day)2022
LANSING WWTPLansing3.2 MGD (million gallons per day)2022
SHELBYVILLE STPShelbyville3.2 MGD (million gallons per day)2022
FRANKLIN STPFranklin3.2 MGD (million gallons per day)2022
ELKTON WWTPElkton3.2 MGD (million gallons per day)2022
MENOMINEE WWTPMenominee3.2 MGD (million gallons per day)2022
PORTAGE LAKE WSAHoughton3.2 MGD (million gallons per day)2022
CADILLAC TWP WTWCadillac3.2 MGD (million gallons per day)2022
Hollister WWTPHollister3.2 MGD (million gallons per day)2022
Republic WWTPRepublic3.2 MGD (million gallons per day)2022
Center Creek WWTPWebb City3.2 MGD (million gallons per day)2022
Warrenton WWTPWarrenton3.2 MGD (million gallons per day)2022
Orrville WWTP & Sewer SystemOrrville3.2 MGD (million gallons per day)2022
Bedford WWTP & Sewer SystemBedford3.2 MGD (million gallons per day)2022
Bucyrus WWTP & Sewer SystemBucyrus3.2 MGD (million gallons per day)2022
Pickerington WWTP & Sewer SystemPickerington3.2 MGD (million gallons per day)2022
CONWAY WWTFConway3.2 MGD (million gallons per day)2022
LEXINGTON E LAGOONLexington3.2 MGD (million gallons per day)2022
WINCHESTER STPWinchester3.2 MGD (million gallons per day)2022
White Oak Regional WWTPHouston3.2 MGD (million gallons per day)2022
West Bastrop WWTPBastrop3.2 MGD (million gallons per day)2022
SNYDERVILLE WRD - SILVER CREEKPark City3.2 MGD (million gallons per day)2022
WISCONSIN RAPIDS STPWisconsin Rapids3.2 MGD (million gallons per day)2022
Lebanon WWTFWest Lebanon3.18 MGD (million gallons per day)2022
HERMISTON Recycled Water PlantHermiston3.17 MGD (million gallons per day)2022
CENTRALIA STPCentralia3.15 MGD (million gallons per day)2022
LEMARS WWTPLe Mars3.14 MGD (million gallons per day)2022
East Aurora (V) WWTPEast Aurora3.14 MGD (million gallons per day)2022
Douglas WWTFDouglas3.1 MGD (million gallons per day)2022
GROTON CITY WPCFGroton3.1 MGD (million gallons per day)2022
Port St. Joe WWTFPort Saint Joe3.1 MGD (million gallons per day)2022
Pooler Wastewater Treatment PlantPooler3.1 MGD (million gallons per day)2022
MAYFIELD STPMayfield3.1 MGD (million gallons per day)2022
LITCHFIELD WWTPLitchfield3.1 MGD (million gallons per day)2022
KALISPELL WWT FACILITYKalispell3.1 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.