Illinois
Lake County drinking water quality
535 active public water systems serve 718,007 people in Lake County. 322 are compliant, 213 had at least one EPA violation in the past three years, 8 are designated serious violators, and 24 carry a health flag.
Active systems
535
103 community systems
People served
718K
by public water systems
Systems with violations
213
40% of active systems, past 3 years
Serious violators
8
24 systems carry a health flag
Needs attention
Highland Park Hospital
IL3163253 · Non-Transient non-community system · Serves 2,800
5 rules violated in the past three years. Unresolved: Chlorine (MRDL), Lead and Copper Rule (LCR), Public Notification Rule, Revised Total Coliform Rule (RTCR), TTHM (Total Trihalomethanes), and Total Haloacetic Acids (HAA5).
Good Shepherd Hospital
IL3130302 · Non-Transient non-community system · Serves 1,290
8 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Public Notification Rule.
Camp Henry Horner/pool Pump House
IL3095117 · Transient non-community system · Serves 920
3 rules violated in the past three years. Unresolved: Public Notification Rule and Revised Total Coliform Rule (RTCR).
Shops of Kildeer
IL3141028 · Non-Transient non-community system · Serves 650
7 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Public Notification Rule.
Gavin Central Elementary
IL3002188 · Non-Transient non-community system · Serves 560
5 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Public Notification Rule.
Jack and Lidias Resort
IL3023564 · Transient non-community system · Serves 100
4 rules violated in the past three years. Unresolved: Public Notification Rule and Revised Total Coliform Rule (RTCR).
Camp Duncan Sorenson Lodge
IL3095133 · Transient non-community system · Serves 25
4 rules violated in the past three years. Unresolved: Groundwater Rule (GWR), Public Notification Rule, and Revised Total Coliform Rule (RTCR).
Bluff Lake Lodges, Inc.
IL0970240 · Antioch · Community water system · Serves 24
8 rules violated in the past three years. Unresolved: Consumer Confidence Rule (CCR) and Lead and Copper Rule (LCR).
Round Lake Park
IL0971600 · Round Lake Park · Community water system · Serves 4,900
4 rules violated in the past three years. Unresolved: Consumer Confidence Rule (CCR), Lead and Copper Rule Revisions (LCRR), and Public Notification Rule.
Camp Duncan Pool
IL3095158 · Transient non-community system · Serves 960
4 rules violated in the past three years. Unresolved: Groundwater Rule (GWR) and Public Notification Rule.
19 more systems with a serious violator or health flag designation are in the lists below.
Community water systems
103 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Waukegan Waukegan |
87,149 | 3 | 1 | |
|
Vernon Hills Lake CO PW Vernon Hills |
33,207 | 1 | 0 | |
|
Mundelein Mundelein |
31,500 | 1 | 0 | |
|
Gurnee Gurnee |
30,193 | 0 | 0 | |
|
Highland Park Highland Park |
30,176 | 0 | 0 | |
|
Round Lake Beach Round Lake Beach |
27,200 | 2 | 0 | |
|
Zion Zion |
24,442 | 3 | 1 | |
|
Great Lakes Naval Training Station North Chicago |
23,000 | 0 | 0 | |
|
Grayslake Grays Lake |
21,248 | 0 | 0 | |
|
Libertyville Libertyville |
20,500 | 1 | 0 | |
|
Lake Zurich Lake Zurich |
19,759 | 1 | 0 | |
|
Lake Forest Lake Forest |
19,642 | 1 | 0 | |
|
Deerfield Deerfield |
19,196 | 3 | 1 | |
|
Round Lake Round Lake |
18,430 | 2 | 0 | |
|
North Chicago North Chicago |
16,813 | 4 | 1 | |
|
Wauconda Wauconda |
15,349 | 1 | 1 | |
|
Lindenhurst Lindenhurst |
14,500 | 3 | 0 | |
|
Antioch Antioch |
14,175 | 2 | 1 | |
|
Wildwood Subdivision Lake CO PW |
14,073 | 1 | 1 | |
|
Fox Lake Fox Lake |
11,780 | 5 | 1 | |
|
Barrington Barrington |
10,327 | 0 | 0 | |
|
Lake Villa Lake Villa |
8,829 | 1 | 0 | |
|
Beach Park Beach Park |
8,710 | 0 | 0 | |
|
Island Lake Island Lake |
8,066 | 1 | 0 | |
|
Lincolnshire Lincolnshire |
7,940 | 1 | 1 | |
|
Volo Volo |
6,629 | 2 | 0 | |
|
Winthrop Harbor Winthrop Harbor |
6,565 | 4 | 3 | |
|
Grandwood Park Subdivision Lake CO PW |
5,751 | 0 | 0 | |
|
Lake Bluff Lake Bluff |
5,600 | 2 | 1 | |
|
Park City Park City |
5,425 | 3 | 0 | |
|
Highwood Highwood |
5,335 | 1 | 1 | |
|
Round Lake Park Round Lake Park |
4,900 | 4 | 1 | |
|
Lcpw Pekara Subdivision |
3,711 | 0 | 0 | |
|
Riverwoods Riverwoods |
3,618 | 1 | 0 | |
|
Hainesville Hainesville |
3,528 | 1 | 0 | |
|
Aqua Illinois-Hawthorn Woods |
3,065 | 3 | 0 | |
|
Lakemoor Lakemoor |
2,720 | 3 | 1 | |
|
Fox Lake Hills Subdivision Lake CO PW |
2,628 | 1 | 0 | |
|
Round Lake Heights Round Lake Heights |
2,622 | 0 | 0 | |
|
Saddlebrook Farms |
2,558 | 1 | 1 | |
|
Park City MHP Park City |
2,460 | 1 | 0 | |
|
Lake Barrington Shores Subdivsion Lake Barrington |
2,300 | 2 | 0 | |
|
Aqua Illinois-Rockwell |
1,762 | 1 | 0 | |
|
Lcpw Brooks Farm Subdivision |
1,563 | 0 | 0 | |
|
Green Oaks Green Oaks |
1,470 | 3 | 0 | |
|
Wynstone Water Company |
1,424 | 1 | 1 | |
|
Tower Lakes Tower Lakes |
1,372 | 1 | 0 | |
|
Countryside Lake Subdivision -Lake CO PW |
1,287 | 0 | 0 | |
|
IL American-Harbor Ridge |
1,064 | 0 | 0 | |
|
Bannockburn Bannockburn |
1,013 | 0 | 0 |
Non-community systems (432: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (1,948, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Illinois records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.