State rankings

Illinois water-system rankings

Community water systems in Illinois ranked by PurityRadar safety score — from EPA violations, enforcement, and PFAS data.

Lowest-scoring systems in Illinois

Ranked lowest score first. Population shown for context.

1 COLLINSVILLE COLLINSVILLE, IL · ~29,500 served 21 2 EAST ALTON EAST ALTON, IL · ~5,786 served 28 3 CREST HILL CREST HILL, IL · ~21,169 served 54 4 ABINGDON MONMOUTH, IL · ~3,275 served 54 5 GALESBURG GALESBURG, IL · ~31,620 served 58 6 PRAIRIE PATH WATER CO-WHISPERING HILLS MCHENRY, IL · ~8,300 served 66 7 NEW BADEN NEW BADEN, IL · ~4,178 served 67 8 FREEPORT FREEPORT, IL · ~23,930 served 69 9 DIXMOOR DIXMOOR, IL · ~2,973 served 70 10 IL AMERICAN-VALLEY VIEW GODFREY, IL · ~6,721 served 71 11 CHANNAHON CHANNAHON, IL · ~13,380 served 72 12 NORTH PARK PWD MACHESNEY PARK, IL · ~35,580 served 75 13 FREEBURG FREEBURG, IL · ~4,707 served 75 14 IL AMERICAN-PEORIA GODFREY, IL · ~137,575 served 76 15 IL AMERICAN-LINCOLN GODFREY, IL · ~15,200 served 81 16 NORTH EAST CENTRAL PWD EDWARDSVILLE, IL · ~3,975 served 83 17 SOUTH ELGIN SOUTH ELGIN, IL · ~23,648 served 85 18 WHISPERING PINES MHP CHICAGO, IL · ~760 served 85 19 GROVE SHORES MOBILE HOME COMMUNITY SKOKIE, IL · ~100 served 85 20 FOX LAKE INGLESIDE, IL · ~11,780 served 86 21 ROCKTON ROCKTON, IL · ~7,685 served 87 22 MOUNT CARMEL MT CARMEL, IL · ~7,015 served 87 23 ROBINSON-PALESTINE WATER COMMISSION ROBINSON, IL · ~11,331 served 88 24 ROCK ISLAND ARSENAL, US ARMY ROCK ISLAND, IL · ~7,800 served 88 25 DUPO DUPO, IL · ~4,684 served 89

Highest-scoring large systems in Illinois

Systems serving 10,000+ people with the best scores.

1 CHICAGO CHICAGO, IL · ~2,746,388 served 100 2 AURORA AURORA, IL · ~183,000 served 100 3 JOLIET JOLIET, IL · ~160,000 served 100 4 NAPERVILLE NAPERVILLE, IL · ~156,406 served 100 5 IL AMERICAN-CHAMPAIGN GODFREY, IL · ~150,000 served 100 6 IL AMERICAN-EAST ST LOUIS GODFREY, IL · ~131,368 served 100 7 SPRINGFIELD SPRINGFIELD, IL · ~117,444 served 100 8 ELGIN ELGIN, IL · ~114,797 served 100
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Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.