STATE / TERRITORY LEDGER
Illinois drinking water system records
EPA compliance fields for active community water systems reporting at least 2,500 people served.
Systems509active CWS · pop. 2,500+
Population served11,211,316reported total; may overlap
Current violation flag34.8%177 systems
Serious-violator flag2.0%10 systems
01 / LARGEST SYSTEMS
Community water systems in Illinois
Population served is a system-reported service figure. It is not a count of unique state residents.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| ChicagoIL0316000 | 2,721,308 | Surface water | No current violation flagged |
| AuroraIL0894070 | 183,000 | Surface water | No current violation flagged |
| JolietIL1970450 | 160,000 | Ground water | No current violation flagged |
| NapervilleIL0434670 | 156,406 | Surface water purchased | No current violation flagged |
| Il American-ChampaignIL0195300 | 150,000 | Ground water | No current violation flagged |
| RockfordIL2010300 | 147,051 | Ground water | No current violation flagged |
| Il American-PeoriaIL1435030 | 137,575 | Surface water | No current violation flagged |
| Il American-East St LouisIL1635040 | 131,368 | Surface water | No current violation flagged |
| SpringfieldIL1671200 | 117,444 | Surface water | No current violation flagged |
| ElginIL0894380 | 114,797 | Surface water | No current violation flagged |
| WaukeganIL0971900 | 87,149 | Surface water | Other current violation flag |
| CiceroIL0310510 | 83,000 | Surface water purchased | Current monitoring/reporting flag |
| Aqua Illinois-KankakeeIL0915030 | 80,000 | Surface water | No current violation flagged |
| BloomingtonIL1130200 | 77,610 | Surface water | No current violation flagged |
| DecaturIL1150150 | 76,122 | Surface water | No current violation flagged |
| SchaumburgIL0314890 | 75,750 | Surface water purchased | No current violation flagged |
| EvanstonIL0310810 | 74,486 | Surface water | No current violation flagged |
| Il American-West SuburbanIL1974151 | 73,978 | Surface water purchased | No current violation flagged |
| Arlington HeightsIL0314030 | 73,320 | Surface water purchased | Other current violation flag |
| PalatineIL0312340 | 70,875 | Surface water purchased | No current violation flagged |
| SkokieIL0312880 | 66,422 | Surface water purchased | Current monitoring/reporting flag |
| Des PlainesIL0310630 | 60,675 | Surface water purchased | Current monitoring/reporting flag |
| Oak LawnIL0312220 | 58,362 | Surface water purchased | Other current violation flag |
| Orland ParkIL0312310 | 58,020 | Surface water purchased | Other current violation flag |
| BerwynIL0310210 | 57,250 | Surface water purchased | Current monitoring/reporting flag |
| Tinley ParkIL0314910 | 56,703 | Surface water purchased | Other current violation flag |
| Oak ParkIL0312250 | 54,583 | Surface water purchased | No current violation flagged |
| WheatonIL0431050 | 53,970 | Surface water purchased | No current violation flagged |
| NormalIL1130900 | 52,736 | Ground water | No current violation flagged |
| RomeovilleIL1970900 | 50,458 | Ground water | No current violation flagged |
| Hoffman EstatesIL0311290 | 50,179 | Surface water purchased | No current violation flagged |
| PlainfieldIL1970800 | 50,000 | Surface water purchased | No current violation flagged |
| Downers GroveIL0430300 | 49,425 | Surface water purchased | No current violation flagged |
| GlenviewIL0311020 | 47,856 | Surface water purchased | Other current violation flag |
| O FallonIL1631100 | 46,603 | Surface water purchased | No current violation flagged |
| Il American-AltonIL1195150 | 46,127 | Surface water | No current violation flagged |
| ElmhurstIL0430350 | 45,000 | Surface water purchased | No current violation flagged |
| MolineIL1610450 | 44,500 | Surface water | No current violation flagged |
| LombardIL0430600 | 44,476 | Surface water purchased | Current monitoring/reporting flag |
| Buffalo GroveIL0314180 | 43,212 | Surface water purchased | No current violation flagged |
| QuincyIL0010650 | 42,000 | Surface water | Other current violation flag |
| BartlettIL0314120 | 41,500 | Surface water purchased | No current violation flagged |
| Mount ProspectIL0311980 | 41,000 | Surface water purchased | Other current violation flag |
| Crystal LakeIL1110150 | 40,661 | Ground water | No current violation flagged |
| DekalbIL0370100 | 40,290 | Ground water | No current violation flagged |
| Carol StreamIL0430200 | 39,854 | Surface water purchased | No current violation flagged |
| Park RidgeIL0312460 | 39,800 | Surface water purchased | Other current violation flag |
| WheelingIL0314970 | 39,725 | Surface water purchased | No current violation flagged |
| StreamwoodIL0313060 | 39,577 | Surface water purchased | No current violation flagged |
| Rock IslandIL1610650 | 39,018 | Surface water | Other current violation flag |
| OswegoIL0930150 | 38,169 | Ground water | No current violation flagged |
| AddisonIL0430050 | 38,017 | Surface water purchased | No current violation flagged |
| CarpentersvilleIL0890200 | 37,983 | Ground water | No current violation flagged |
| Hanover ParkIL0314480 | 37,470 | Surface water purchased | Other current violation flag |
| Calumet CityIL0310390 | 37,000 | Surface water purchased | Current health-based flag |
| North Park PwdIL2015500 | 35,580 | Ground water | No current violation flagged |
| NorthbrookIL0312070 | 34,407 | Surface water | No current violation flagged |
| Il American-Granite CityIL1195030 | 33,572 | Surface water | No current violation flagged |
| WoodridgeIL0431250 | 33,566 | Surface water purchased | Other current violation flag |
| Vernon Hills - Lake Co PwIL0971750 | 33,207 | Surface water purchased | No current violation flagged |
| Glendale HeightsIL0430400 | 33,176 | Surface water purchased | No current violation flagged |
| St CharlesIL0894830 | 33,103 | Ground water | Current monitoring/reporting flag |
| Elk Grove VillageIL0314400 | 31,802 | Surface water purchased | Other current violation flag |
| Il American-PekinIL1795040 | 31,731 | Ground water | No current violation flagged |
| GalesburgIL0950200 | 31,620 | Ground water | No current violation flagged |
| MundeleinIL0971150 | 31,500 | Surface water purchased | No current violation flagged |
| AlgonquinIL1110050 | 30,700 | Ground water | No current violation flagged |
| GurneeIL0970350 | 30,193 | Surface water purchased | No current violation flagged |
| Highland ParkIL0970500 | 30,176 | Surface water | No current violation flagged |
| Aqua Illinois-Vermilion CountyIL1835120 | 30,106 | Surface water | No current violation flagged |
| Aqua Illinois-North Maine UtilitiesIL0315350 | 30,043 | Surface water purchased | No current violation flagged |
| South Stickny SdIL0317370 | 30,000 | Surface water purchased | Other current violation flag |
| Ej Water CooperativeIL0790010 | 29,720 | Surface water | Other current violation flag |
| CollinsvilleIL1194280 | 29,500 | Ground water | No current violation flagged |
| NilesIL0312010 | 29,350 | Surface water purchased | Other current violation flag |
| LansingIL0311590 | 29,076 | Surface water purchased | Current monitoring/reporting flag |
| MontgomeryIL0894690 | 28,956 | Ground water | No current violation flagged |
| Glen EllynIL0430450 | 28,850 | Surface water purchased | Other current violation flag |
| Lake In The HillsIL1110400 | 28,661 | Ground water | No current violation flagged |
| HuntleyIL1110350 | 28,495 | Ground water | No current violation flagged |
| New LenoxIL1970700 | 27,690 | Surface water purchased | No current violation flagged |
| Oak ForestIL0312190 | 27,478 | Surface water purchased | Current monitoring/reporting flag |
| Round Lake BeachIL0971550 | 27,200 | Surface water purchased | No current violation flagged |
| WilmetteIL0313300 | 27,087 | Surface water | Other current violation flag |
| EdwardsvilleIL1190250 | 26,808 | Ground water | No current violation flagged |
| Chicago HeightsIL0310450 | 26,184 | Surface water purchased | Current monitoring/reporting flag |
| BataviaIL0894130 | 26,098 | Ground water | No current violation flagged |
| WoodstockIL1110950 | 25,630 | Ground water | No current violation flagged |
| BelvidereIL0070050 | 25,339 | Ground water | Other current violation flag |
| Morton GroveIL0311950 | 25,297 | Surface water purchased | Other current violation flag |
| West ChicagoIL0430900 | 25,166 | Ground water | No current violation flagged |
| Elmwood ParkIL0310780 | 25,000 | Surface water purchased | Other current violation flag |
| HarveyIL0311110 | 25,000 | Surface water purchased | Current monitoring/reporting flag |
| Il American-Homer TownshipIL1970100 | 24,543 | Surface water purchased | No current violation flagged |
| ZionIL0972000 | 24,442 | Surface water purchased | Other current violation flag |
| LisleIL0430551 | 24,223 | Surface water purchased | Other current violation flag |
| Melrose ParkIL0311860 | 24,206 | Surface water purchased | No current violation flagged |
| WestmontIL0430950 | 24,161 | Surface water purchased | No current violation flagged |
| MaywoodIL0311830 | 24,090 | Surface water purchased | Current health-based flag |
| FrankfortIL1970400 | 24,000 | Ground water | Other current violation flag |
Showing the 100 largest systems by reported population served.
02 / CITY REPORTS
Browse cities
Charleston2 systemsEast Peoria2 systemsEffingham2 systemsEldorado2 systemsEureka2 systemsForest Park2 systemsHampshire2 systemsHighland2 systemsManhattan2 systemsMarion2 systemsNashville2 systemsNormal2 systemsNorth Chicago2 systemsOak Brook2 systemsSpringfield2 systemsAddison1 systemsAlgonquin1 systemsAlsip1 systemsAlton1 systemsAntioch1 systemsArlington Heights1 systemsAurora1 systemsBarrington1 systemsBartlett1 systemsBatavia1 systemsBellwood1 systemsBelvidere1 systemsBensenville1 systemsBerwyn1 systemsBethalto1 systemsBloomington1 systemsBlue Island1 systemsBolingbrook1 systemsBridgeview1 systemsBrookfield1 systemsBuffalo Grove1 systemsBurbank (South Stickney)1 systemsBurr Ridge1 systemsCahokia1 systemsCalumet City1 systemsCanton1 systemsCarbondale1 systemsCarol Stream1 systemsCarpentersville1 systemsCary1 systemsCaseyville1 systemsCentralia1 systemsChampaign1 systemsChannahon1 systemsChatham1 systemsChicago Heights1 systemsChicago Ridge1 systemsCicero1 systemsColeta1 systemsCollinsville1 systemsColumbia1 systemsCountry Club Hills1 systemsCrest Hill1 systemsCrestwood1 systemsCrystal Lake1 systemsDanville1 systemsDarien1 systemsDe Kalb1 systemsDecatur1 systemsDeerfield1 systemsDes Plaines1 systemsDixon1 systemsDolton1 systemsDowners Grove1 systemsEast Moline1 systemsEast St Louis1 systemsEdwardsville1 systemsElgin1 systemsElk Grove1 systemsElmhurst1 systemsElmwood Park1 systemsEvanston1 systemsEvergreen Park1 systemsFox Lake1 systemsFrankfort1 systemsFranklin Park1 systemsFreeport1 systemsGalesburg1 systemsGeneva1 systemsGlen Carbon1 systemsGlen Ellyn1 systemsGlendale Heights1 systemsGlenview1 systemsGranite City1 systemsGrays Lake1 systemsGurnee1 systemsHanover Park1 systemsHarvey1 systemsHazel Crest1 systemsHerrin1 systemsHickory Hills1 systemsHighland Park1 systemsHinsdale1 systemsHoffman Estates1 systemsHomewood1 systems
03 / COUNTY REPORTS
Browse counties
Cook113 systemsLake40 systemsDuPage32 systemsWill21 systemsKane19 systemsMadison19 systemsMcHenry13 systemsSt. Clair11 systemsLaSalle8 systemsSangamon8 systemsTazewell8 systemsWilliamson8 systemsRock Island7 systemsWinnebago7 systemsChampaign6 systemsDeKalb6 systemsFranklin6 systemsMarion6 systemsClinton5 systemsColes5 systemsJackson5 systemsMacoupin5 systemsMcLean5 systemsGrundy4 systemsHenry4 systemsMacon4 systemsMorgan4 systemsOgle4 systemsPeoria4 systemsRandolph4 systemsVermilion4 systemsWhiteside4 systemsWoodford4 systemsAdams3 systemsClark3 systemsDouglas3 systemsJefferson3 systemsKendall3 systemsKnox3 systemsLee3 systemsLivingston3 systemsMcDonough3 systemsMonroe3 systemsSaline3 systemsBond2 systemsBoone2 systemsBureau2 systemsChristian2 systemsCrawford2 systemsEffingham2 systemsFayette2 systemsFord2 systemsGreene2 systemsHamilton2 systemsHancock2 systemsJasper2 systemsJersey2 systemsKankakee2 systemsLawrence2 systemsMassac2 systemsMenard2 systemsMontgomery2 systemsMoultrie2 systemsPerry2 systemsPike2 systemsStephenson2 systemsWashington2 systemsWayne2 systemsFulton1 systemsLogan1 systems