PlainWater

WONDER LAKE (NIU)

PWS ID: IL1115850 · WONDER LAKE, Illinois 60097

Population Served
1,950
Total Violations
402
Health-Based Violations
18
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
780
County
McHenry
School/Daycare
No
MCL Violations
18
Monitoring Violations
374
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
1,2-Dichloropropane MR 21 1993
Benzene MR 21 1993
Ethylbenzene MR 21 1993
Tetrachloroethylene MR 21 1993
cis-1,2-Dichloroethylene MR 20 1993
Xylenes, Total MR 20 1993
o-Dichlorobenzene MR 20 1993
p-Dichlorobenzene MR 20 1993
1,1-Dichloroethylene MR 20 1993
trans-1,2-Dichloroethylene MR 20 1993
1,2-Dichloroethane MR 20 1993
1,1,1-Trichloroethane MR 20 1993
Carbon tetrachloride MR 20 1993
Trichloroethylene MR 20 1993
Toluene MR 20 1993
CHLOROBENZENE MR 20 1993
Styrene MR 20 1993
Coliform (TCR) MR 19 2002
Arsenic MCL 12 2013
Coliform (TCR) MCL 6 1998
Lead and Copper Rule MR 4 2004
Revised Total Coliform Rule MON 3 2024
Chlorine MR 3 2024
Gross Alpha, Excl. Radon and U MR 1 1977
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.