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World wastewater treatment plant observatory · data as reported by each inventory

Wastewater treatment plants in United States · Illinois

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766 inventory records · EPA Clean Watersheds Needs Survey 2022

Data years: 2022. The inventory date does not establish current operation.

766 results

CompareNameNative sizeYear
WOODSTOCK NORTH STPWoodstock3.5 MGD (million gallons per day)2022
BLOOMINGDALE, VILLAGE OFBloomingdale3.45 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
ITASCA WWTP - PROSPECT AVEItasca3.2 MGD (million gallons per day)2022
ADDISON WWTP SOUTHAddison3.2 MGD (million gallons per day)2022
CENTRALIA STPCentralia3.15 MGD (million gallons per day)2022
Christian County WRD Elm Street CSO Treatment FacilityTaylorville3.02 MGD (million gallons per day)2022
Christian County WRD WWTPTaylorville3.02 MGD (million gallons per day)2022
BOLINGBROOK WRF #2Bolingbrook3 MGD (million gallons per day)2022
ROCK FALLS WWTP - N ANIXTER RDRock Falls3 MGD (million gallons per day)2022
MACOMB SEWAGE TREAT PLANTMacomb3 MGD (million gallons per day)2022
SOUTH BELOIT STPSouth Beloit3 MGD (million gallons per day)2022
PERU WWTP 1Peru3 MGD (million gallons per day)2022
MCHENRY CENTRAL STPMchenry3 MGD (million gallons per day)2022
CHESTER STPChester3 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
HAMPSHIRE WWTPHampshire2.76 MGD (million gallons per day)2022
CARBONDALE NWWTPCarbondale2.64 MGD (million gallons per day)2022
Huntley, West PlantHuntley2.6 MGD (million gallons per day)2022
Morris, Main WWTPMorris2.5 MGD (million gallons per day)2022
MOKENA STPMokena2.5 MGD (million gallons per day)2022
ROBINSON STPRobinson2.5 MGD (million gallons per day)2022
PLANO STPPlano2.44 MGD (million gallons per day)2022
HANOVER PARK WWTP NO.1Hanover Park2.42 MGD (million gallons per day)2022
DuQuoin STPDu Quoin2.4 MGD (million gallons per day)2022
MENDOTA STPMendota2.4 MGD (million gallons per day)2022
MORTON STP 2Morton2.39 MGD (million gallons per day)2022
EAST DUNDEE STPDundee2.3 MGD (million gallons per day)2022
MWRDGC, LEMONT WRPLemont2.3 MGD (million gallons per day)2022
WASHINGTON STP 2Washington2.29 MGD (million gallons per day)2022
LOCKPORT, BONNIE BRAE STP (NORTH BASIN)Lockport2.26 MGD (million gallons per day)2022
MINOOKA STPMinooka2.2 MGD (million gallons per day)2022
OLNEY STPOlney2.2 MGD (million gallons per day)2022
PRINCETON STPPrinceton2.15 MGD (million gallons per day)2022
LITCHFIELD STPLitchfield2.14 MGD (million gallons per day)2022
Lake County DPW, Mill Creek WWTPWadsworth2.1 MGD (million gallons per day)2022
WATERLOO, CITY OFWaterloo2.086 MGD (million gallons per day)2022
METROPOLIS STPMetropolis2.05 MGD (million gallons per day)2022
BOLINGBROOK STP#1Bolingbrook2.04 MGD (million gallons per day)2022
BRAIDWOOD STPBraidwood2 MGD (million gallons per day)2022
KEWANEE STP & COLLECTION SYSTEMKewanee2 MGD (million gallons per day)2022
ANTIOCH STPAntioch2 MGD (million gallons per day)2022
NORTHERN MORAINE WW RECLAMATION DISIsland Lake2 MGD (million gallons per day)2022
LINDENHURST SANITARY DISTRICTLake Villa2 MGD (million gallons per day)2022
Roselle - J.L. Devlin WWTPRoselle2 MGD (million gallons per day)2022
MT. CARMEL WWTPMount Carmel2 MGD (million gallons per day)2022
WOOD DALE STP NORTHWood Dale1.97 MGD (million gallons per day)2022
WAUCONDA STPWauconda1.9 MGD (million gallons per day)2022
HERRIN STPHerrin1.81 MGD (million gallons per day)2022
HARVARD STPHarvard1.8 MGD (million gallons per day)2022
Huntley, East PlantHuntley1.8 MGD (million gallons per day)2022
MARENGO STPMarengo1.8 MGD (million gallons per day)2022
STOOKEY TWP PLT #3Belleville1.75 MGD (million gallons per day)2022
WOODSTOCK-SOUTH STPWoodstock1.75 MGD (million gallons per day)2022
BEARDSTOWN STPBeardstown1.75 MGD (million gallons per day)2022
CREST HILL STW-EASTCrest Hill1.7 MGD (million gallons per day)2022
MILAN SEW TREATMENT PLANTMilan1.7 MGD (million gallons per day)2022
CRYSTAL LAKE STP #3Crystal Lake1.7 MGD (million gallons per day)2022
CLINTON SDClinton1.68 MGD (million gallons per day)2022
SALEM STPSalem1.67 MGD (million gallons per day)2022
WATSEKA SEWAGE WORKSWatseka1.6 MGD (million gallons per day)2022
HIGHLAND STPHighland1.6 MGD (million gallons per day)2022
HARRISBURG STPHarrisburg1.6 MGD (million gallons per day)2022
MOMENCE STPMomence1.6 MGD (million gallons per day)2022
GREENVILLE STWGreenville1.57 MGD (million gallons per day)2022
SANDWICH STWSandwich1.5 MGD (million gallons per day)2022
PITTSFIELD MAIN PLANTPittsfield1.5 MGD (million gallons per day)2022
ST CLAIR STPBelleville1.5 MGD (million gallons per day)2022
ROCK ISLAND STP SWRock Island1.5 MGD (million gallons per day)2022
GENESEO STPGeneseo1.5 MGD (million gallons per day)2022
CAIRO STPCairo1.5 MGD (million gallons per day)2022
CARLINVILLE STPCarlinville1.5 MGD (million gallons per day)2022
Cortland, Town ofCortland1.5 MGD (million gallons per day)2022
COLUMBIA STPColumbia1.47 MGD (million gallons per day)2022
PARIS-SOUTH STPParis1.4 MGD (million gallons per day)2022
CARMI STPCarmi1.4 MGD (million gallons per day)2022
WEST FRANKFORT STPWest Frankfort1.4 MGD (million gallons per day)2022
TROY STPTroy1.35 MGD (million gallons per day)2022
MANHATTAN STPManhattan1.35 MGD (million gallons per day)2022
HOOPESTON STPHoopeston1.32 MGD (million gallons per day)2022
CREST HILL STW - WESTCrest Hill1.3 MGD (million gallons per day)2022
VANDALIA STPVandalia1.3 MGD (million gallons per day)2022
MURPHYSBORO, CITY OFMurphysboro1.27 MGD (million gallons per day)2022
ELBURN WWTPElburn1.266 MGD (million gallons per day)2022
WILMINGTON SWG TRMT PLANTWilmington1.25 MGD (million gallons per day)2022
FOX RIVER GROVE STPFox River Grove1.25 MGD (million gallons per day)2022
MARSEILLES STPMarseilles1.23 MGD (million gallons per day)2022
ROSELLE-BOTTERMAN STPRoselle1.22 MGD (million gallons per day)2022
BEECHER STPBeecher1.2 MGD (million gallons per day)2022
E PEORIA SEWAGE PLT NO 3East Peoria1.2 MGD (million gallons per day)2022
PANA STPPana1.17 MGD (million gallons per day)2022
GALENA STPGalena1.17 MGD (million gallons per day)2022
MANTENO, VILLAGE OFManteno1.15 MGD (million gallons per day)2022
WOOD DALE SOUTH STPWood Dale1.13 MGD (million gallons per day)2022
CREVE COEUR STPCreve Coeur1.1 MGD (million gallons per day)2022
SPRING VALLEY STPSpring Valley1.1 MGD (million gallons per day)2022
HILLSBORO STPHillsboro1.05 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.