PlainWater
Counties → Illinois

Lake County, Illinois

Water Systems
540
Population Served
719,035
Total Violations
33,311
2,524 health-based
PFAS Detected
9
of 36 tested

Violation Analysis

70.4%
Systems with Violations
61.7
Avg Violations per System
7.6%
Health-Based Violations

Water Source Types

SW
34 systems (6%)
GW
16 systems (3%)

PFAS Contamination

36
Systems Tested
9
PFAS Detected
25.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Lake Illinois water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (50)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Waukegan 87,149 118 Clean
Vernon Hills - Lake Co Pw 33,207 64 Clean
Mundelein 31,500 77 Clean
Gurnee 30,193 68 Clean
Highland Park 30,176 16 Clean
Round Lake Beach 27,200 38 Clean
Zion 24,442 21 Clean
Great Lakes Naval Training Station 23,000 38 Clean
Grayslake 21,248 33 Clean
Libertyville 20,500 27 Detected
Lake Zurich 19,759 260 Detected
Lake Forest 19,642 33 Clean
Deerfield 19,196 44 Clean
Round Lake 18,430 33 Clean
North Chicago 16,813 154 Clean
Wildwood Subdivision - Lake Co Pw 14,832 53 Clean
Lindenhurst 14,500 89 Clean
Antioch 14,175 115 Clean
Wauconda 14,084 29 Clean
Captain James a Lovell Fhcc 12,100 98 Clean
Fox Lake 11,780 49 Detected
Barrington 10,327 16 Clean
Lake Villa 8,829 75 Clean
Beach Park 8,710 8 Clean
Island Lake 8,066 10 Clean
Lincolnshire 7,940 17 Clean
Volo 6,629 136 Clean
Winthrop Harbor 6,565 102 Clean
Grandwood Park Subdivision - Lake Co Pw 5,751 61 Clean
Lake Bluff 5,600 49 Clean
Park City 5,425 52 Clean
Highwood 5,335 37 Clean
Round Lake Park 4,900 30 Clean
Lcpw - Pekara Subdivision 3,711 5 Clean
Riverwoods 3,618 27 Clean
Hainesville 3,528 107 Clean
Aqua Illinois-Hawthorn Woods 3,065 23 -
Highland Park Hospital 2,800 53 -
Lakemoor 2,720 5 -
Fox Lake Hills Subdivision - Lake Co Pw 2,628 11 -
Round Lake Heights 2,622 6 -
Saddlebrook Farms 2,558 50 -
Baxter Health Care/Hanline 2,500 23 -
Park City MHP 2,460 30 -
Lake Barrington Shores Subdivsion 2,300 216 -
Aqua Illinois-Rockwell 1,762 71 -
Lcpw - Brooks Farm Subdivision 1,563 2 -
Green Oaks 1,470 24 -
Wynstone Water Company 1,424 318 -
Tower Lakes 1,372 208 -

Other Counties in Illinois

Cook County
427 systems · 5,304,996 served · 21,728 violations
DuPage County
207 systems · 861,775 served · 15,779 violations
Will County
330 systems · 622,572 served · 37,818 violations
Kane County
191 systems · 592,544 served · 12,844 violations
McHenry County
307 systems · 271,051 served · 11,554 violations
Madison County
68 systems · 268,778 served · 1,940 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Lake County? ▼
Lake County has 33,311 total drinking water violations across 540 water systems, of which 2,524 are health-based violations. 70.4% of systems have at least one violation.
How many people get water from Lake County systems? ▼
Water systems in Lake County serve approximately 719,035 people through 540 public water systems.
Has PFAS been detected in Lake County water? ▼
Of 36 water systems tested for PFAS in Lake County, 9 had PFAS detected (25.0% detection rate).
What types of water sources supply Lake County? ▼
Water systems in Lake County use SW (34 systems), GW (16 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 7.6% of Lake County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.