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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
Benton WWTP & Collection SystemBenton1.01 MGD (million gallons per day)2022
DIXON CORRECTIONAL CENTER SEWAGE TREATMENTDixon1 MGD (million gallons per day)2022
POPLAR GROVE SOUTH STPPoplar Grove1 MGD (million gallons per day)2022
PERU WWTP 2Peru1 MGD (million gallons per day)2022
GREENROCK-COLONA REG STPColona1 MGD (million gallons per day)2022
JERSEYVILLE STP SOUTHJerseyville1 MGD (million gallons per day)2022
LAWRENCEVILLE STPLawrenceville1 MGD (million gallons per day)2022
Mill Creek Water Reclamation DistriGeneva1 MGD (million gallons per day)2022
Gilberts, Village ofGilberts1 MGD (million gallons per day)2022
FLORA STPFlora1 MGD (million gallons per day)2022
MONTICELLO STP & COLLECTION SYSTEMMonticello1 MGD (million gallons per day)2022
DWIGHT STPDwight0.983 MGD (million gallons per day)2022
MASCOUTAH, CITY OFMascoutah0.97 MGD (million gallons per day)2022
MILLSTADT STPMillstadt0.965 MGD (million gallons per day)2022
SMITHTON WWTPSmithton0.95 MGD (million gallons per day)2022
MORRISON STP & COLLECTION SYSTEMMorrison0.941 MGD (million gallons per day)2022
EAST ALTON STPEast Alton0.91 MGD (million gallons per day)2022
FAIRFIELD SEWAGE TREATMENFairfield0.91 MGD (million gallons per day)2022
Morris, East WWTPMorris0.9 MGD (million gallons per day)2022
MAHOMET STPMahomet0.9 MGD (million gallons per day)2022
OGLESBY STPOglesby0.879 MGD (million gallons per day)2022
SAVANNA, City ofSavanna0.86 MGD (million gallons per day)2022
ANNA STPAnna0.85 MGD (million gallons per day)2022
LEBANON STPLebanon0.848 MGD (million gallons per day)2022
CHILLICOTHE STPChillicothe0.8 MGD (million gallons per day)2022
MT MORRIS STPMount Morris0.8 MGD (million gallons per day)2022
Caseyville Township West FacilityFairview Heights0.786 MGD (million gallons per day)2022
NEW BADEN STPNew Baden0.78 MGD (million gallons per day)2022
GENOA, CITY OFGenoa0.78 MGD (million gallons per day)2022
WESTVILLE-BELGIUM STPWestville0.77 MGD (million gallons per day)2022
CHRISTOPHER STPChristopher0.77 MGD (million gallons per day)2022
SULLIVAN STPSullivan0.75 MGD (million gallons per day)2022
TUSCOLA STW. SOUTHTuscola0.75 MGD (million gallons per day)2022
ABINGDON STPAbingdon0.74 MGD (million gallons per day)2022
MORTON STP 3Morton0.73 MGD (million gallons per day)2022
SHELBYVILLE STPShelbyville0.73 MGD (million gallons per day)2022
COAL CITY STPCoal City0.725 MGD (million gallons per day)2022
CHANNAHON STPChannahon0.72 MGD (million gallons per day)2022
CARLYLE STP & COLLECTION SYSTEMCarlyle0.71 MGD (million gallons per day)2022
ST. CHARLES WEST STPSaint Charles0.7 MGD (million gallons per day)2022
Eldorado WTFEldorado0.7 MGD (million gallons per day)2022
Pingree Grove, Village ofPingree Grove0.7 MGD (million gallons per day)2022
HAVANA STPHavana0.7 MGD (million gallons per day)2022
CARTERVILLE STWCarterville0.7 MGD (million gallons per day)2022
BREESE STPBreese0.69 MGD (million gallons per day)2022
KNOXVILLE STPKnoxville0.66 MGD (million gallons per day)2022
LEROY SEWAGE TREATMENT PLLe Roy0.66 MGD (million gallons per day)2022
Fairbury STP & Collection SystemFairbury0.66 MGD (million gallons per day)2022
ROCKTON SEWAGE TREATMENTRockton0.65 MGD (million gallons per day)2022
Roxana, Village ofSouth Roxana0.65 MGD (million gallons per day)2022
SPARTA, SOUTHEAST STPSparta0.65 MGD (million gallons per day)2022
DIAMOND STPCoal City0.65 MGD (million gallons per day)2022
RUSHVILLE STWRushville0.63 MGD (million gallons per day)2022
OREGON STPOregon0.626 MGD (million gallons per day)2022
AUBURN STPAuburn0.62 MGD (million gallons per day)2022
RED BUD STPRed Bud0.61 MGD (million gallons per day)2022
LENA WASTEWATER TREAT WKSLena0.6 MGD (million gallons per day)2022
DUPO SEWAGE WORKSDupo0.6 MGD (million gallons per day)2022
WASHINGTON STP 1Washington0.6 MGD (million gallons per day)2022
PECATONICA SEWAGE TREATMEPecatonica0.6 MGD (million gallons per day)2022
Davis Junction WWTPDavis Junction0.6 MGD (million gallons per day)2022
GEORGETOWN STPGeorgetown0.6 MGD (million gallons per day)2022
LEWISTOWN STPLewistown0.6 MGD (million gallons per day)2022
GIBSON CITY STPGibson City0.58 MGD (million gallons per day)2022
BYRON STPByron0.57 MGD (million gallons per day)2022
ST JOSEPH STPSaint Joseph0.56 MGD (million gallons per day)2022
STOCKTON STWStockton0.55 MGD (million gallons per day)2022
GIRARD STPGirard0.55 MGD (million gallons per day)2022
BRIGHTON STPBrighton0.55 MGD (million gallons per day)2022
MOUNT OLIVE-NORTH STPMount Olive0.55 MGD (million gallons per day)2022
JOHNSTON CITY STPJohnston City0.55 MGD (million gallons per day)2022
PAXTON STPPaxton0.54 MGD (million gallons per day)2022
CARTHAGE ST FACCarthage0.54 MGD (million gallons per day)2022
FARMINGTON STPFarmington0.54 MGD (million gallons per day)2022
RIVERTON SEWER & STPRiverton0.53 MGD (million gallons per day)2022
ALBION STPAlbion0.51 MGD (million gallons per day)2022
PEOTONE STPPeotone0.5 MGD (million gallons per day)2022
GILMAN STP and COL. SYS.Gilman0.5 MGD (million gallons per day)2022
FOX LAKE TALL OAKS STPFox Lake0.5 MGD (million gallons per day)2022
ROODHOUSE WWTPRoodhouse0.5 MGD (million gallons per day)2022
ROCKDALE STPRockdale0.5 MGD (million gallons per day)2022
EUREKA STPEureka0.5 MGD (million gallons per day)2022
RICHMOND SEWAGE TMT PLANTRichmond0.5 MGD (million gallons per day)2022
Spring Grove WWTP-NewSpring Grove0.5 MGD (million gallons per day)2022
HEBRON COLLECTION SYSTEMHebron0.5 MGD (million gallons per day)2022
Johnsburg WWTPJohnsburg0.5 MGD (million gallons per day)2022
LaSalle East Side WWTP (New Plant)La Salle0.5 MGD (million gallons per day)2022
ARTHUR STPArthur0.5 MGD (million gallons per day)2022
ARCOLA STPArcola0.5 MGD (million gallons per day)2022
TUSCOLA, NORTH WWTPTuscola0.5 MGD (million gallons per day)2022
POLO STPPolo0.5 MGD (million gallons per day)2022
AMBOY STPAmboy0.5 MGD (million gallons per day)2022
MCLEANSBORO STPMc Leansboro0.5 MGD (million gallons per day)2022
GILLESPIE STPGillespie0.5 MGD (million gallons per day)2022
STAUNTON EAST STPStaunton0.5 MGD (million gallons per day)2022
TRENTON STPTrenton0.5 MGD (million gallons per day)2022
STEELEVILLE STPSteeleville0.5 MGD (million gallons per day)2022
NEWTON STPNewton0.5 MGD (million gallons per day)2022
NASHVILLE STPNashville0.5 MGD (million gallons per day)2022
SHAWNEETOWN STPShawneetown0.49 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.