Mchenry
PWSID: IL1110600
System Details
| Population Served | 22,335 |
| Service Connections | 8,484 |
| Water Source | Groundwater |
| System Type | Community Water System |
| Owner | Local Government |
| Status | Active |
| City | Mchenry |
| Zip Code | 60050 |
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|
| Lead (90th percentile) | 0.0120 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0076 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0063 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0033 mg/L | 0.015 mg/L | Below Action Level |
1 Active Violations
| Contaminant | Violation | Date | Health-Based | Status |
|---|
| | 2025-07-01 | | Open |
Violation History (89 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|
| | 2023-10-01 | | Returned to Compliance |
| | 2023-10-01 | | Returned to Compliance |
| | 2023-10-01 | | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Returned to Compliance |
| | 2023-01-01 | Major | Acknowledged |
| | 2023-01-01 | Major | Acknowledged |
Showing 50 of 88 historical violations.