County · Illinois
Lake County, Illinois: drinking water records
This overview covers 28 ZIP codes and 102 community water systems in Lake County. It also stands in for 1 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| North Chicago IL0971250 | 16,813 | 120 | 0 | 2 | 0 ppb |
| Volo IL0971770 | 6,629 | 120 | 0 | 1 | 0 ppb |
| Round Lake Park IL0971600 | 4,900 | 180 | 0 | 1 | 1.4 ppb |
| Waukegan IL0971900 | 87,149 | 120 | 0 | 0 | 9 ppb |
| Vernon Hills - Lake Co Pw IL0971750 | 33,207 | 120 | 0 | 0 | 0 ppb |
| Mundelein IL0971150 | 31,500 | 120 | 0 | 0 | 7.4 ppb |
| Gurnee IL0970350 | 30,193 | 120 | 0 | 0 | 0.3 ppb |
| Highland Park IL0970500 | 30,176 | 120 | 0 | 0 | 11 ppb |
| Round Lake Beach IL0971550 | 27,200 | 120 | 0 | 0 | 4.6 ppb |
| Zion IL0972000 | 24,442 | 120 | 0 | 0 | 9.1 ppb |
| Great Lakes Naval Training Station IL0975227 | 23,000 | 120 | 0 | 0 | 0.8 ppb |
| Grayslake IL0970250 | 21,248 | 120 | 0 | 0 | 12 ppb |
| Libertyville IL0970900 | 20,500 | 120 | 1 | 0 | 8.4 ppb |
| Lake Zurich IL0970850 | 19,759 | 300 | 2 | 0 | 6.9 ppb |
| Lake Forest IL0970800 | 19,642 | 120 | 0 | 0 | 28 ppb |
| Deerfield IL0974340 | 19,196 | 120 | 0 | 0 | 5.2 ppb |
| Round Lake IL0971500 | 18,430 | 120 | 0 | 0 | 2.5 ppb |
| Wauconda IL0971850 | 15,349 | 120 | 0 | 0 | 9.6 ppb |
| Wildwood Subdivision - Lake Co Pw IL0977350 | 14,832 | 120 | 0 | 0 | 1.3 ppb |
| Lindenhurst IL0971000 | 14,500 | 120 | 0 | 0 | 3.9 ppb |
| Antioch IL0970050 | 14,175 | 420 | 0 | 0 | 9 ppb |
| Fox Lake IL0970200 | 11,780 | 240 | 2 | 0 | 6.1 ppb |
| Barrington IL0974080 | 10,327 | 120 | 0 | 0 | 9.2 ppb |
| Lake Villa IL0970840 | 8,829 | 120 | 0 | 0 | 2.6 ppb |
| Beach Park IL0970190 | 8,710 | 120 | 0 | 0 | 0 ppb |
ZIP reports in Lake County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 60075.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.