EPA EXPORT · 13 SEP 2026FEDERAL COMPLIANCE RECORDS · NOT A HOME WATER TEST
TAP WATERLEDGERPublic system compliance records

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 systemPopulation servedPrimary sourceCurrent export status
ChicagoIL03160002,721,308Surface waterNo current violation flagged
AuroraIL0894070183,000Surface waterNo current violation flagged
JolietIL1970450160,000Ground waterNo current violation flagged
NapervilleIL0434670156,406Surface water purchasedNo current violation flagged
Il American-ChampaignIL0195300150,000Ground waterNo current violation flagged
RockfordIL2010300147,051Ground waterNo current violation flagged
Il American-PeoriaIL1435030137,575Surface waterNo current violation flagged
Il American-East St LouisIL1635040131,368Surface waterNo current violation flagged
SpringfieldIL1671200117,444Surface waterNo current violation flagged
ElginIL0894380114,797Surface waterNo current violation flagged
WaukeganIL097190087,149Surface waterOther current violation flag
CiceroIL031051083,000Surface water purchasedCurrent monitoring/reporting flag
Aqua Illinois-KankakeeIL091503080,000Surface waterNo current violation flagged
BloomingtonIL113020077,610Surface waterNo current violation flagged
DecaturIL115015076,122Surface waterNo current violation flagged
SchaumburgIL031489075,750Surface water purchasedNo current violation flagged
EvanstonIL031081074,486Surface waterNo current violation flagged
Il American-West SuburbanIL197415173,978Surface water purchasedNo current violation flagged
Arlington HeightsIL031403073,320Surface water purchasedOther current violation flag
PalatineIL031234070,875Surface water purchasedNo current violation flagged
SkokieIL031288066,422Surface water purchasedCurrent monitoring/reporting flag
Des PlainesIL031063060,675Surface water purchasedCurrent monitoring/reporting flag
Oak LawnIL031222058,362Surface water purchasedOther current violation flag
Orland ParkIL031231058,020Surface water purchasedOther current violation flag
BerwynIL031021057,250Surface water purchasedCurrent monitoring/reporting flag
Tinley ParkIL031491056,703Surface water purchasedOther current violation flag
Oak ParkIL031225054,583Surface water purchasedNo current violation flagged
WheatonIL043105053,970Surface water purchasedNo current violation flagged
NormalIL113090052,736Ground waterNo current violation flagged
RomeovilleIL197090050,458Ground waterNo current violation flagged
Hoffman EstatesIL031129050,179Surface water purchasedNo current violation flagged
PlainfieldIL197080050,000Surface water purchasedNo current violation flagged
Downers GroveIL043030049,425Surface water purchasedNo current violation flagged
GlenviewIL031102047,856Surface water purchasedOther current violation flag
O FallonIL163110046,603Surface water purchasedNo current violation flagged
Il American-AltonIL119515046,127Surface waterNo current violation flagged
ElmhurstIL043035045,000Surface water purchasedNo current violation flagged
MolineIL161045044,500Surface waterNo current violation flagged
LombardIL043060044,476Surface water purchasedCurrent monitoring/reporting flag
Buffalo GroveIL031418043,212Surface water purchasedNo current violation flagged
QuincyIL001065042,000Surface waterOther current violation flag
BartlettIL031412041,500Surface water purchasedNo current violation flagged
Mount ProspectIL031198041,000Surface water purchasedOther current violation flag
Crystal LakeIL111015040,661Ground waterNo current violation flagged
DekalbIL037010040,290Ground waterNo current violation flagged
Carol StreamIL043020039,854Surface water purchasedNo current violation flagged
Park RidgeIL031246039,800Surface water purchasedOther current violation flag
WheelingIL031497039,725Surface water purchasedNo current violation flagged
StreamwoodIL031306039,577Surface water purchasedNo current violation flagged
Rock IslandIL161065039,018Surface waterOther current violation flag
OswegoIL093015038,169Ground waterNo current violation flagged
AddisonIL043005038,017Surface water purchasedNo current violation flagged
CarpentersvilleIL089020037,983Ground waterNo current violation flagged
Hanover ParkIL031448037,470Surface water purchasedOther current violation flag
Calumet CityIL031039037,000Surface water purchasedCurrent health-based flag
North Park PwdIL201550035,580Ground waterNo current violation flagged
NorthbrookIL031207034,407Surface waterNo current violation flagged
Il American-Granite CityIL119503033,572Surface waterNo current violation flagged
WoodridgeIL043125033,566Surface water purchasedOther current violation flag
Vernon Hills - Lake Co PwIL097175033,207Surface water purchasedNo current violation flagged
Glendale HeightsIL043040033,176Surface water purchasedNo current violation flagged
St CharlesIL089483033,103Ground waterCurrent monitoring/reporting flag
Elk Grove VillageIL031440031,802Surface water purchasedOther current violation flag
Il American-PekinIL179504031,731Ground waterNo current violation flagged
GalesburgIL095020031,620Ground waterNo current violation flagged
MundeleinIL097115031,500Surface water purchasedNo current violation flagged
AlgonquinIL111005030,700Ground waterNo current violation flagged
GurneeIL097035030,193Surface water purchasedNo current violation flagged
Highland ParkIL097050030,176Surface waterNo current violation flagged
Aqua Illinois-Vermilion CountyIL183512030,106Surface waterNo current violation flagged
Aqua Illinois-North Maine UtilitiesIL031535030,043Surface water purchasedNo current violation flagged
South Stickny SdIL031737030,000Surface water purchasedOther current violation flag
Ej Water CooperativeIL079001029,720Surface waterOther current violation flag
CollinsvilleIL119428029,500Ground waterNo current violation flagged
NilesIL031201029,350Surface water purchasedOther current violation flag
LansingIL031159029,076Surface water purchasedCurrent monitoring/reporting flag
MontgomeryIL089469028,956Ground waterNo current violation flagged
Glen EllynIL043045028,850Surface water purchasedOther current violation flag
Lake In The HillsIL111040028,661Ground waterNo current violation flagged
HuntleyIL111035028,495Ground waterNo current violation flagged
New LenoxIL197070027,690Surface water purchasedNo current violation flagged
Oak ForestIL031219027,478Surface water purchasedCurrent monitoring/reporting flag
Round Lake BeachIL097155027,200Surface water purchasedNo current violation flagged
WilmetteIL031330027,087Surface waterOther current violation flag
EdwardsvilleIL119025026,808Ground waterNo current violation flagged
Chicago HeightsIL031045026,184Surface water purchasedCurrent monitoring/reporting flag
BataviaIL089413026,098Ground waterNo current violation flagged
WoodstockIL111095025,630Ground waterNo current violation flagged
BelvidereIL007005025,339Ground waterOther current violation flag
Morton GroveIL031195025,297Surface water purchasedOther current violation flag
West ChicagoIL043090025,166Ground waterNo current violation flagged
Elmwood ParkIL031078025,000Surface water purchasedOther current violation flag
HarveyIL031111025,000Surface water purchasedCurrent monitoring/reporting flag
Il American-Homer TownshipIL197010024,543Surface water purchasedNo current violation flagged
ZionIL097200024,442Surface water purchasedOther current violation flag
LisleIL043055124,223Surface water purchasedOther current violation flag
Melrose ParkIL031186024,206Surface water purchasedNo current violation flagged
WestmontIL043095024,161Surface water purchasedNo current violation flagged
MaywoodIL031183024,090Surface water purchasedCurrent health-based flag
FrankfortIL197040024,000Ground waterOther current violation flag

Showing the 100 largest systems by reported population served.

02 / CITY REPORTS

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03 / COUNTY REPORTS

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