Lake County tap water
0 of 35 water systems serving Lake County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 102 community water systems list this county as served; 35 serve 3,300+ people with full PFAS testing.
- 8 had a health-based violation since 2021-10-26.
Largest systems serving this county
| System | Source | People served (whole system) | PFAS above a 2024 level? | Violations since 2021-10-26 |
|---|---|---|---|---|
| Waukegan | Surface water | 87,149 | No | 0 |
| Vernon Hills - Lake CO Pw | Purchased surface water | 33,207 | No | 0 |
| Mundelein | Purchased surface water | 31,500 | No | 0 |
| Gurnee | Purchased surface water | 30,193 | No | 0 |
| Highland Park | Surface water | 30,176 | No | 0 |
| Round Lake Beach | Purchased surface water | 27,200 | No | 0 |
| Zion | Purchased surface water | 24,442 | No | 0 |
| Great Lakes Naval Training Station | Surface water | 23,000 | No | 0 |
| Grayslake | Purchased surface water | 21,248 | No | 0 |
| Libertyville | Purchased surface water | 20,500 | No | 0 |
| Lake Zurich | Groundwater | 19,759 | No | 0 |
| Lake Forest | Surface water | 19,642 | No | 0 |
Which one is yours? A county usually has several utilities. Your bill or your utility's annual water-quality report names yours. Population is for the whole system, which can cross county lines.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.