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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
Saint Albans City WWTFSaint Albans4 MGD (million gallons per day)2022
RICHLANDS WWTP & COLLECTION SYSTEMRichlands4 MGD (million gallons per day)2022
BIG STONE GAP WWTP & COLLECTION SYSBig Stone Gap4 MGD (million gallons per day)2022
HALIFAX S T PSouth Boston4 MGD (million gallons per day)2022
WYTHEVILLE REGIONAL STP & COLL. SYSWytheville4 MGD (million gallons per day)2022
STUARTS DRAFT STPStuarts Draft4 MGD (million gallons per day)2022
FISHERSVILLE STPStaunton4 MGD (million gallons per day)2022
HOQUIAM WASTEWATER TREATMENT PLANTHoquiam4 MGD (million gallons per day)2022
Sand Dunes WWTPMoses Lake4 MGD (million gallons per day)2022
WEIRTON WWTPWeirton4 MGD (million gallons per day)2022
ST ALBANS WWTPSaint Albans4 MGD (million gallons per day)2022
OCONOMOWOC WWTPOconomowoc4 MGD (million gallons per day)2022
Pumpkinvine Creek WPCPDallas3.99 MGD (million gallons per day)2022
Montpelier WWTFMontpelier3.97 MGD (million gallons per day)2022
ELWOOD WWTPElwood3.95 MGD (million gallons per day)2022
Aberdeen Wastewater Treatment FacilityAberdeen3.946 MGD (million gallons per day)2022
SHEFFIELD WWTPSheffield3.9 MGD (million gallons per day)2022
Pagosa Area WSDPagosa Springs3.9 MGD (million gallons per day)2022
EAST HAMPTON WPCFEast Hampton3.9 MGD (million gallons per day)2022
Okeechobee UA Cemetery Road WWTFOkeechobee3.9 MGD (million gallons per day)2022
FAIRMONT WWTPFairmont3.9 MGD (million gallons per day)2022
Bennettsville, City ofBennettsville3.9 MGD (million gallons per day)2022
Claremont WWTFClaremont3.89 MGD (million gallons per day)2022
WINSTON-SALEMWinston Salem3.884 MGD (million gallons per day)2022
LINCOLN SEWERAGE SYSTEMLincoln3.88 MGD (million gallons per day)2022
Wilmington WWTP & Sewer SystemWilmington3.88 MGD (million gallons per day)2022
Muscle Shoals WWTPMuscle Shoals3.86 MGD (million gallons per day)2022
BRUNSWICK STPBrunswick3.85 MGD (million gallons per day)2022
Raritan Township MUA -Flemington WWTF - STPRaritan3.85 MGD (million gallons per day)2022
ELLENSBURG STPEllensburg3.85 MGD (million gallons per day)2022
Delphos WWTP & Sewer SystemDelphos3.83 MGD (million gallons per day)2022
Decatur WWTPDecatur3.8 MGD (million gallons per day)2022
Stillwater WWTFAnderson3.8 MGD (million gallons per day)2022
PLAINVILLE WPCFPlainville3.8 MGD (million gallons per day)2022
SIMSBURY WPCFSimsbury3.8 MGD (million gallons per day)2022
JEROME STPJerome3.8 MGD (million gallons per day)2022
Westfield Sewerage Collection System and WWTFWestfield3.8 MGD (million gallons per day)2022
Easthampton Sewerage Collection System and WWTFEasthampton3.8 MGD (million gallons per day)2022
Hannibal WWTPHannibal3.8 MGD (million gallons per day)2022
Raritan Township MUA- South Main STP/CSFlemington3.8 MGD (million gallons per day)2022
Chillicothe WWTP & Sewer SystemChillicothe3.8 MGD (million gallons per day)2022
Ottawa Co Danbury Township WWTPPort Clinton3.8 MGD (million gallons per day)2022
BRISTOL WWTFBristol3.8 MGD (million gallons per day)2022
Del Rio - San Felipe WWTPDel Rio3.8 MGD (million gallons per day)2022
Nederland WWTPNederland3.8 MGD (million gallons per day)2022
EAST WENATCHEE STPEast Wenatchee3.8 MGD (million gallons per day)2022
SOUTH CHARLESTON WWTPCharleston3.8 MGD (million gallons per day)2022
Jackson WWTP & Sewer SystemJackson3.79 MGD (million gallons per day)2022
BURLINGTON TREATMENTBurlington3.79 MGD (million gallons per day)2022
CANTON WEST STPCanton3.78 MGD (million gallons per day)2022
Los Ojos State Fish Hatchery NMDGFLos Ojos3.776 MGD (million gallons per day)2022
Southbridge Sewerage Collection System and WWTFSouthbridge3.77 MGD (million gallons per day)2022
Prescott Valley WRPPrescott Valley3.75 MGD (million gallons per day)2022
Barling WWTPBarling3.75 MGD (million gallons per day)2022
SOUTH WINDSOR WPCFSouth Windsor3.75 MGD (million gallons per day)2022
EFFINGHAM WWTP & COLLECTION SYSTEMEffingham3.75 MGD (million gallons per day)2022
Westfield - Westside WWTPWestfield3.75 MGD (million gallons per day)2022
Oneida (C) STPOneida3.75 MGD (million gallons per day)2022
BLACKRIVER WWTP (DUNN)Dunn3.75 MGD (million gallons per day)2022
BETHANY-WARR ACRES WWTEdmond3.75 MGD (million gallons per day)2022
San Benito WWTPSan Benito3.75 MGD (million gallons per day)2022
Airport WWTP #3Galveston3.75 MGD (million gallons per day)2022
COURTLAND STPCourtland3.75 MGD (million gallons per day)2022
CERES WWTPCeres3.73 MGD (million gallons per day)2022
Oyster Creek WWTPAngleton3.72 MGD (million gallons per day)2022
NEVADA WWTPNevada3.71 MGD (million gallons per day)2022
Big Spring WWTPBig Spring3.71 MGD (million gallons per day)2022
Northgate WWTPHouston3.71 MGD (million gallons per day)2022
Kodiak WWTPKodiak3.7 MGD (million gallons per day)2022
Laguna CSD WWTFSanta Maria3.7 MGD (million gallons per day)2022
SPENCER WWTPSpencer3.7 MGD (million gallons per day)2022
Phillipsburg Town - CS/WWTPPhillipsburg3.7 MGD (million gallons per day)2022
Gouverneur (V) WWTPGouverneur3.7 MGD (million gallons per day)2022
BARRINGTON STPBarrington3.68 MGD (million gallons per day)2022
BARTLETT WWTPBartlett3.68 MGD (million gallons per day)2022
HASTINGS WWTPHastings3.68 MGD (million gallons per day)2022
Burlington Township - Central Ave STP/CSBurlington3.65 MGD (million gallons per day)2022
WASHINGTON WWTPWashington3.65 MGD (million gallons per day)2022
WHITEWATER STPWhitewater3.65 MGD (million gallons per day)2022
GLASTONBURY WPCFGlastonbury3.64 MGD (million gallons per day)2022
Long Key et alLong Key3.64 MGD (million gallons per day)2022
DURANT UA WWTDurant3.64 MGD (million gallons per day)2022
YORKVILLE, YORKVILLE-BRISTOL STPYorkville3.62 MGD (million gallons per day)2022
Covington STPCovington3.62 MGD (million gallons per day)2022
El Mirage WRFEl Mirage3.6 MGD (million gallons per day)2022
Northwest Arkansas WWTPBentonville3.6 MGD (million gallons per day)2022
RIDGECREST WWTFRidgecrest3.6 MGD (million gallons per day)2022
SASM WWTFMill Valley3.6 MGD (million gallons per day)2022
S. MARIN SUBREG OUTFALLMill Valley3.6 MGD (million gallons per day)2022
Deer Creek WWTPShingle Springs3.6 MGD (million gallons per day)2022
BANNING WWTFBanning3.6 MGD (million gallons per day)2022
Arapahoe County WWAEnglewood3.6 MGD (million gallons per day)2022
Monterey WRFJacksonville3.6 MGD (million gallons per day)2022
Swainsboro WPCPSwainsboro3.6 MGD (million gallons per day)2022
REXBURG TREATMENT FACILITYRexburg3.6 MGD (million gallons per day)2022
STERLING-ELKHORN CRK. STPSterling3.6 MGD (million gallons per day)2022
MADISONMadison3.6 MGD (million gallons per day)2022
JASPER WWTPJasper3.6 MGD (million gallons per day)2022
CRESTON WWTPCreston3.6 MGD (million gallons per day)2022
GREAT BEND WWTPGreat Bend3.6 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.