Water quality in Knollwood, Illinois
Knollwood is in Lake County. 535 active public water systems serve the county; 213 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Lake County
102 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Lake Bluff Estates MHP Lake Bluff |
165 | 1 | 0.5 mi | |
| Whispering Lakes Water System, Inc. |
375 | 1 | 1.3 mi | |
| Heiden Gardens Condos |
217 | 1 | 1.4 mi | |
| Central Lake County Jawa Lake Bluff |
0 | 0 | 1.4 mi | |
| Lake Co. PW Arden Shores Estates |
105 | 0 | 1.4 mi | |
| Green Oaks Green Oaks |
1,470 | 3 | 2.2 mi | |
| North Chicago North Chicago |
16,813 | 4 | 2.4 mi | |
| Great Lakes Naval Training Station North Chicago |
23,000 | 0 | 2.4 mi | |
| Lake Forest Lake Forest |
19,642 | 1 | 3.4 mi | |
| Libertyville Libertyville |
20,500 | 1 | 4.4 mi | |
| Park City Park City |
5,425 | 3 | 4.5 mi | |
| Park City MHP Park City |
2,460 | 1 | 4.8 mi | |
| Elm Oak Mutual Water System |
50 | 1 | 5.0 mi | |
| Ciel Senior Living Vernon Hills |
225 | 1 | 5.4 mi | |
| Waukegan Waukegan |
87,149 | 3 | 5.9 mi | |
| Vernon Hills Lake CO PW Vernon Hills |
33,207 | 1 | 6.0 mi | |
| Highwood Highwood |
5,335 | 1 | 6.4 mi | |
| Bannockburn Bannockburn |
1,013 | 0 | 6.4 mi | |
| Lincolnshire Lincolnshire |
7,940 | 1 | 6.5 mi | |
| Gurnee Gurnee |
30,193 | 0 | 6.7 mi | |
| Dayspring Bible College Mundelein |
30 | 1 | 6.7 mi | |
| Wildwood Subdivision Lake CO PW |
14,073 | 1 | 6.8 mi | |
| Mundelein Mundelein |
31,500 | 1 | 6.8 mi | |
| Towners Subdivision |
206 | 2 | 7.0 mi | |
| Aqua Illinois-Ravenna |
267 | 1 | 7.1 mi |
Non-community systems in Lake County (432: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Lake County, nearest to Knollwood first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
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.