Lake Forest
PWSID: IL0970800
This system has no unresolved violations. The most recent violation on record was 2024-07-01.
This system has more violations on record than 80% of water systems in Illinois.
Violation trend: 1.4 per year over the last 5 years, similar to 1.2 per year in the previous 5.
System Details
| Population Served | 19,642 |
| Service Connections | 6,925 |
| Water Source | Surface Water |
| System Type | Community Water System |
| Owner | Local Government |
| Status | Active |
| City | Lake Forest |
| EPA ZIP on File | 60045 |
Areas Served
- Lake Forest, Lake County
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Lead (90th percentile) | 0.0240 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0110 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0081 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) | 0.0076 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0065 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0065 mg/L | 0.015 mg/L | Below Action Level |
Violation History (15 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 2920 | TT Measured: 0.8500 RATIO | 2024-07-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.8300 RATIO | 2024-07-01 | Yes | Acknowledged |
| 2920 | TT Measured: 0.7600 RATIO | 2024-07-01 | Yes | Acknowledged |
| 5000 | MR | 2023-10-01 | Returned to Compliance | |
| 5000 | MR | 2023-10-01 | Returned to Compliance | |
| 5000 | MR | 2023-10-01 | Returned to Compliance | |
| 5000 | MR | 2023-10-01 | Returned to Compliance | |
| 2950 | MR | 2019-02-01 | Major | Returned to Compliance |
| 2950 | MR | 2019-02-01 | Major | Returned to Compliance |
| 2456 | MR | 2019-02-01 | Major | Returned to Compliance |
| 2456 | MR | 2019-02-01 | Major | Returned to Compliance |
| 7000 | Other | 2017-07-01 | Returned to Compliance | |
| 7000 | Other | 2017-07-01 | Returned to Compliance | |
| 5000 | TT | 1994-01-01 | Yes | Returned to Compliance |
| 5000 | TT | 1992-12-07 | Yes | Returned to Compliance |
Understanding This Water System's Record
Lake Forest is a community water system water system that draws from surface water sources and serves a population of 19,642 in Lake Forest, Illinois. This page shows its complete compliance history as reported to the EPA's Safe Drinking Water Information System (SDWIS), the federal database that tracks every public water system in the United States.
What Do These Violations Mean?
Health-based violations mean the system exceeded an EPA maximum contaminant level (MCL) or failed to provide required treatment. These indicate potential health risks from contaminants like lead, arsenic, bacteria, nitrates, or disinfection byproducts. Non-health-based violations involve monitoring, reporting, or procedural requirements — the system missed a testing deadline or failed to notify customers, but contaminant levels were not necessarily unsafe.
What Should You Do?
Your water utility is required to publish an annual Consumer Confidence Report (CCR) that details test results and any violations. If your system has active health-based violations, consider a certified water filter rated for the specific contaminants involved. The contaminant guides on this site explain health risks and filter options for common pollutants. For the most current results, contact your water utility directly — EPA data can lag weeks or months behind real-time testing.