Illinois Water Quality

1,782 water systems serving 12,123,082 people. 28,017 total violations on record.

Safety Grade Distribution

A

553

31%

B

261

15%

C

836

47%

D

60

3%

F

72

4%

1,782

Water Systems

12,123,082

Population Served

28,017

Total Violations

2,913

Health-Based

Largest Water Systems in Illinois

Water SystemGradePopulationViolations
CHICAGO
C
2,746,38898
AURORA
A
183,0001
JOLIET
C
160,00029
NAPERVILLE
C
156,4065
IL AMERICAN-CHAMPAIGN
A
150,0000
ROCKFORD
C
147,05122
IL AMERICAN-PEORIA
A
137,5752
IL AMERICAN-EAST ST LOUIS
A
131,3683
SPRINGFIELD
C
117,4448
ELGIN
C
114,79716
WAUKEGAN
C
87,14921
CICERO
C
83,00013
AQUA ILLINOIS-KANKAKEE
D
80,00013
BLOOMINGTON
C
77,6104
DECATUR
C
76,1224
SCHAUMBURG
C
75,75011
EVANSTON
A
74,4861
IL AMERICAN-WEST SUBURBAN
A
73,9780
ARLINGTON HEIGHTS
C
73,32045
PALATINE
A
70,8754

Contaminants in Illinois

Cities in Illinois