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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
MWRDGC, Stickney Treatment PlantCicero1,200 MGD (million gallons per day)2022
MWRDGC, CALUMET WRP, MWRDGCChicago354 MGD (million gallons per day)2022
MWRDGC, NORTHSIDE (Terrence O'Brien) WRPSkokie333 MGD (million gallons per day)2022
MWRDGC, JAMES C. KIRIE WRPChicago52 MGD (million gallons per day)2022
FOX METRO WATER RECLAMATION DISTRICTOswego42 MGD (million gallons per day)2022
Decatur Sanitary DistrictDecatur41 MGD (million gallons per day)2022
Four Rivers Sanitation AuthorityRockford40 MGD (million gallons per day)2022
PEORIA STPPeoria37 MGD (million gallons per day)2022
Sangamon Co. WRD SPRING CREEK WWTPSpringfield32 MGD (million gallons per day)2022
MWRDGC, JOHN E EGAN WRPSchaumburg30 MGD (million gallons per day)2022
SAUGET - AMERICAN BOTTOMS REG. STPEast Saint Louis27 MGD (million gallons per day)2022
NAPERVILLENaperville26.25 MGD (million gallons per day)2022
Kankakee River Metropolitan AgencyKankakee25 MGD (million gallons per day)2022
FRWRD Main STP aka Pagorski WWTPElgin25 MGD (million gallons per day)2022
NORTH SHORE S.D. - GURNEE STPGurnee23.6 MGD (million gallons per day)2022
GRANITE CITY REGIONAL WWTP & COLL SYSTEMGranite City23 MGD (million gallons per day)2022
BLOOMINGTON-NORMAL WEST (OLD) STPBloomington22.5 MGD (million gallons per day)2022
WAUKEGAN STP - NORTH SHORE S.D.Waukegan22 MGD (million gallons per day)2022
JOLIET - EASTSIDE STPJoliet18.2 MGD (million gallons per day)2022
NORTH SHORE S.D. - CLAVEY RD PLANTHighland Park17.8 MGD (million gallons per day)2022
URBANA CHAMPAIGN SD -NORTHEAST STPUrbana17.3 MGD (million gallons per day)2022
GLENBARD WASTEWATER AUTHORITYGlen Ellyn16.02 MGD (million gallons per day)2022
DANVILLE SANITARY DISTRICTDanville16 MGD (million gallons per day)2022
Lake County DPW (Desplaines STP)Buffalo Grove16 MGD (million gallons per day)2022
Thorn Creek Basin. S.D. STPChicago Heights15.94 MGD (million gallons per day)2022
Sangamon Co. WRD SUGAR CREEK WWTPSpringfield15 MGD (million gallons per day)2022
JOLIET-WESTSIDE STPJoliet14 MGD (million gallons per day)2022
QUINCY, CITY OFQuincy13.5 MGD (million gallons per day)2022
WOODRIDGE, GREEN VALLEY WWTPWoodridge12 MGD (million gallons per day)2022
Flagg Creek Wtr Reclamation DistricHinsdale12 MGD (million gallons per day)2022
MWRDGC, HANOVER PARK WRPHanover Park12 MGD (million gallons per day)2022
CASEYVILLE TWNSHP (EAST)Caseyville11.39 MGD (million gallons per day)2022
EAST MOLINE REGIONAL STPEast Moline11.1 MGD (million gallons per day)2022
GALESBURG SANITARY DISTRICTGalesburg11 MGD (million gallons per day)2022
DOWNERS GROVE SD & COLL SYSTDowners Grove11 MGD (million gallons per day)2022
DUPAGE CO DPW, KNOLLWOOD STPBurr Ridge10 MGD (million gallons per day)2022
NORTHWEST REGIONAL WRF @ FOX LAKEFox Lake9 MGD (million gallons per day)2022
MOLINE SOUTH WWTPMoline9 MGD (million gallons per day)2022
ST. CHARLES EAST STPSaint Charles9 MGD (million gallons per day)2022
WHEATON SANITARY DISTRICT - STPWheaton8.9 MGD (million gallons per day)2022
KISHWAUKEE WRD WWTPDekalb8.63 MGD (million gallons per day)2022
ELMHURST WWTP & COLLECTION SYSTEMElmhurst8 MGD (million gallons per day)2022
BELLEVILLE STP #1Belleville8 MGD (million gallons per day)2022
ROCK ISLAND MAIN STPRock Island8 MGD (million gallons per day)2022
Urbana & Champaign Southwest STPChampaign7.98 MGD (million gallons per day)2022
FRWRD North WRFElgin7.75 MGD (million gallons per day)2022
Joliet, Aux Sable Creek Basin WWTPJoliet7.7 MGD (million gallons per day)2022
WEST CHICAGO STPWest Chicago7.64 MGD (million gallons per day)2022
JACKSONVILLE STPJacksonville7.57 MGD (million gallons per day)2022
Bloomington-Normal Southeast (New)Heyworth7.5 MGD (million gallons per day)2022
Plainfield WWTP & Collection SystemPlainfield7.5 MGD (million gallons per day)2022
ROMEOVILLE WWTP & COLLECTION SYSTEMRomeoville7.5 MGD (million gallons per day)2022
PEKIN STP #1Pekin6.84 MGD (million gallons per day)2022
FREEPORT STPFreeport6.75 MGD (million gallons per day)2022
CAROL STREAM STPCarol Stream6.5 MGD (million gallons per day)2022
CARBONDALE SEWWTPCarbondale6 MGD (million gallons per day)2022
Lake County DPW, New Century TownVernon Hills6 MGD (million gallons per day)2022
COLLINSVILLE STPCollinsville5.85 MGD (million gallons per day)2022
BELVIDERE STPBelvidere5.8 MGD (million gallons per day)2022
CRYSTAL LAKE STP 1&2Crystal Lake5.8 MGD (million gallons per day)2022
O'Fallon, CityO Fallon5.61 MGD (million gallons per day)2022
MOLINE NORTH SLOPE SEWAGEMoline5.5 MGD (million gallons per day)2022
MATTOON STPMattoon5.3 MGD (million gallons per day)2022
ADDISON WWTP-NORTHAddison5.3 MGD (million gallons per day)2022
GLENDALE HEIGHTS STWGlendale Heights5.26 MGD (million gallons per day)2022
WOOD RIVER STPWood River5.1 MGD (million gallons per day)2022
SWANSEA STPSwansea5.015 MGD (million gallons per day)2022
MT VERNON WWTP & Collection SystemMount Vernon5 MGD (million gallons per day)2022
LOCKPORT, Division St . WWTPLockport5 MGD (million gallons per day)2022
GENEVA STPGeneva5 MGD (million gallons per day)2022
FRWRD West STPElgin5 MGD (million gallons per day)2022
ALGONQUIN WWTFAlgonquin5 MGD (million gallons per day)2022
MARION STPMarion4.95 MGD (million gallons per day)2022
MUNDELEIN STPLibertyville4.95 MGD (million gallons per day)2022
Sycamore North WWTPSycamore4.9 MGD (million gallons per day)2022
ROCHELLERochelle4.87 MGD (million gallons per day)2022
BENSENVILLE MAIN WWTP & COLL SYSTEMBensenville4.7 MGD (million gallons per day)2022
FRANKFORT WEST (REGIONAL) STPFrankfort4.67 MGD (million gallons per day)2022
Monmouth, City ofMonmouth4.62 MGD (million gallons per day)2022
DIXON SEWAGE TREATMENTDixon4.5 MGD (million gallons per day)2022
CARPENTERSVILLE WWTPCarpentersville4.5 MGD (million gallons per day)2022
LAKE IN THE HILLS Sanitary DistrictLake In The Hills4.5 MGD (million gallons per day)2022
Belleville STP #2Belleville4.39 MGD (million gallons per day)2022
RANTOUL STPRantoul4.33 MGD (million gallons per day)2022
EDWARDSVILLE STPEdwardsville4.28 MGD (million gallons per day)2022
EAST PEORIA SEWAGE TP #1East Peoria4.2 MGD (million gallons per day)2022
BATAVIA STPBatavia4.2 MGD (million gallons per day)2022
OTTAWA WWTP & Collection SystemOttawa4 MGD (million gallons per day)2022
STREATOR STPStreator4 MGD (million gallons per day)2022
LIBERTYVILLE STPLibertyville4 MGD (million gallons per day)2022
McHenry South WWTPMchenry4 MGD (million gallons per day)2022
LINCOLN SEWERAGE SYSTEMLincoln3.88 MGD (million gallons per day)2022
CANTON WEST STPCanton3.78 MGD (million gallons per day)2022
EFFINGHAM WWTP & COLLECTION SYSTEMEffingham3.75 MGD (million gallons per day)2022
BARRINGTON STPBarrington3.68 MGD (million gallons per day)2022
BARTLETT WWTPBartlett3.68 MGD (million gallons per day)2022
YORKVILLE, YORKVILLE-BRISTOL STPYorkville3.62 MGD (million gallons per day)2022
STERLING-ELKHORN CRK. STPSterling3.6 MGD (million gallons per day)2022
DEERFIELD STP & COLL SYSTEMDeerfield3.5 MGD (million gallons per day)2022
PONTIAC, City ofPontiac3.5 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.