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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
ALTAMONT STP SOUTHAltamont0.488 MGD (million gallons per day)2022
DePue STPDepue0.48 MGD (million gallons per day)2022
GRIGGSVILLE SEWAGE PLANTGriggsville0.48 MGD (million gallons per day)2022
WILLIAMSVILLE STPWilliamsville0.47 MGD (million gallons per day)2022
MASON CITY STPMason City0.47 MGD (million gallons per day)2022
FULTON STPFulton0.47 MGD (million gallons per day)2022
EL PASO STPEl Paso0.46 MGD (million gallons per day)2022
TILTON STPTilton0.46 MGD (million gallons per day)2022
ROSEVILLE STPRoseville0.46 MGD (million gallons per day)2022
MARSHALL STPMarshall0.45 MGD (million gallons per day)2022
HAMILTON STPHamilton0.45 MGD (million gallons per day)2022
WYOMING STPWyoming0.43 MGD (million gallons per day)2022
WINCHESTER STP & COLLECTION SYSTEMWinchester0.412 MGD (million gallons per day)2022
OBLONG STPOblong0.41 MGD (million gallons per day)2022
CATLIN STPCatlin0.4 MGD (million gallons per day)2022
SANGAMON VALLEY PWD - STPMahomet0.4 MGD (million gallons per day)2022
ELWOOD STPElwood0.4 MGD (million gallons per day)2022
MARISSA STPMarissa0.4 MGD (million gallons per day)2022
FREEBURG WEST NO 2Freeburg0.4 MGD (million gallons per day)2022
PRINCEVILLE-N.E. STPPrinceville0.4 MGD (million gallons per day)2022
ORION STPOrion0.4 MGD (million gallons per day)2022
HEYWORTH STPHeyworth0.4 MGD (million gallons per day)2022
Otter Creek Lake Utility DistrictDavis0.4 MGD (million gallons per day)2022
GRAYVILLE STPGrayville0.4 MGD (million gallons per day)2022
SESSER STPSesser0.4 MGD (million gallons per day)2022
ASSUMPTION STPAssumption0.39 MGD (million gallons per day)2022
Galva Northeast STPGalva0.385 MGD (million gallons per day)2022
EARLVILLE STPEarlville0.38 MGD (million gallons per day)2022
DELAVAN STPDelavan0.38 MGD (million gallons per day)2022
METAMORA SOUTH STPMetamora0.38 MGD (million gallons per day)2022
DE PUE STPDepue0.38 MGD (million gallons per day)2022
CARROLTON STPCarrollton0.38 MGD (million gallons per day)2022
EAST DUBUQUE WWTPEast Dubuque0.38 MGD (million gallons per day)2022
SENECA STPSeneca0.38 MGD (million gallons per day)2022
NEOGA STPNeoga0.37 MGD (million gallons per day)2022
MT STERLING STP,N.E.Mount Sterling0.37 MGD (million gallons per day)2022
SHERIDAN S.D. WWTPSheridan0.368 MGD (million gallons per day)2022
LADD SEWAGE TREATMENT PLTLadd0.365 MGD (million gallons per day)2022
MAROA STPMaroa0.36 MGD (million gallons per day)2022
WHITE HALL STWWhite Hall0.36 MGD (million gallons per day)2022
MOUNT CARROLL STPMount Carroll0.36 MGD (million gallons per day)2022
NOKOMIS STPNokomis0.36 MGD (million gallons per day)2022
FARMER CITY STPFarmer City0.36 MGD (million gallons per day)2022
ASHTON TREATMENT SYSTEMAshton0.35 MGD (million gallons per day)2022
DURAND STPDurand0.35 MGD (million gallons per day)2022
FORREST WWTPForrest0.35 MGD (million gallons per day)2022
VIRGINIA STPVirginia0.35 MGD (million gallons per day)2022
BENLD STPBenld0.35 MGD (million gallons per day)2022
St. Elmo, Village ofAltamont0.343 MGD (million gallons per day)2022
MINONK STPMinonk0.34 MGD (million gallons per day)2022
LANARK STPLanark0.34 MGD (million gallons per day)2022
GARDNER STPGardner0.332 MGD (million gallons per day)2022
MORRISONVILLE STPMorrisonville0.33 MGD (million gallons per day)2022
WARREN, VILLAGE OFWarren0.33 MGD (million gallons per day)2022
LACON STPLacon0.32 MGD (million gallons per day)2022
NAUVOO WWTPNauvoo0.32 MGD (million gallons per day)2022
KIRKLAND, VILLAGE OFKirkland0.31 MGD (million gallons per day)2022
SOMONAUK WWTPSomonauk0.31 MGD (million gallons per day)2022
FREEBURG EAST NO 1Freeburg0.31 MGD (million gallons per day)2022
CAMBRIDGE STPCambridge0.31 MGD (million gallons per day)2022
NEW ATHENS STPNew Athens0.3 MGD (million gallons per day)2022
PORT BYRON SEWERS & STPPort Byron0.3 MGD (million gallons per day)2022
PAWNEE STPPawnee0.3 MGD (million gallons per day)2022
EDINBURG STPEdinburg0.3 MGD (million gallons per day)2022
SANDOVAL STPSandoval0.3 MGD (million gallons per day)2022
CENTRAL CITY STPCentralia0.3 MGD (million gallons per day)2022
Galva Southwest STPGalva0.3 MGD (million gallons per day)2022
PETERSBURG STPPetersburg0.3 MGD (million gallons per day)2022
HENRY STPHenry0.3 MGD (million gallons per day)2022
MOUNDS STPMounds0.3 MGD (million gallons per day)2022
MANITO STPManito0.3 MGD (million gallons per day)2022
VIRDEN STP EASTVirden0.3 MGD (million gallons per day)2022
ELMWOOD STPElmwood0.29 MGD (million gallons per day)2022
GRANVILLE STPGranville0.289 MGD (million gallons per day)2022
WARRENSBURG STPWarrensburg0.28 MGD (million gallons per day)2022
ASTORIA STPAstoria0.28 MGD (million gallons per day)2022
HANNA CITY STPHanna City0.27 MGD (million gallons per day)2022
CHENOA STPChenoa0.26 MGD (million gallons per day)2022
Prophetstown STPProphetstown0.26 MGD (million gallons per day)2022
NORRIS CITY STPNorris City0.26 MGD (million gallons per day)2022
CARRIER MILLS STPCarrier Mills0.26 MGD (million gallons per day)2022
CUBA STPCuba0.26 MGD (million gallons per day)2022
HOPKINS PARK WWTPHopkins Park0.25 MGD (million gallons per day)2022
ONARGA STWOnarga0.25 MGD (million gallons per day)2022
OKAWVILLE STPOkawville0.25 MGD (million gallons per day)2022
HARRISTOWN STPHarristown0.25 MGD (million gallons per day)2022
BUSHNELL STP (WEST)Bushnell0.25 MGD (million gallons per day)2022
Bushnell East WWTPBushnell0.25 MGD (million gallons per day)2022
OAK HIGHLANDS I P WWT FACJoliet0.25 MGD (million gallons per day)2022
MAPLE PARK STPMaple Park0.25 MGD (million gallons per day)2022
HOLIDAY SHORES WWTPEdwardsville0.25 MGD (million gallons per day)2022
BRIDGEPORT STPBridgeport0.25 MGD (million gallons per day)2022
KINCAID WWTP & COLLECTION SYSTEMKincaid0.25 MGD (million gallons per day)2022
ALEDO STP NORTHAledo0.25 MGD (million gallons per day)2022
ALEDO STP SOUTHAledo0.25 MGD (million gallons per day)2022
Pembroke TownshipHopkins Park0.25 MGD (million gallons per day)2022
CROSSVILLE STPCrossville0.25 MGD (million gallons per day)2022
BUNKER HILL STPBunker Hill0.25 MGD (million gallons per day)2022
SPARTA, NORTHWEST STPSparta0.25 MGD (million gallons per day)2022
LA HARPE STPLa Harpe0.25 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.