Air Quality
Good
Water Violations
32
Active Contamination
30
Active Permits
19
Air quality in Lake County is rated good with a median AQI of 40 (200 days measured in 2025). 21 community water systems serve the area, with 32 recent violations in the last 5 years. 116 contamination sites are tracked, including 27 open leaking tank incidents.
Air Quality — Lake County (2025)i
AQSThe Air Quality Index measures how clean or polluted the air is on a given day. AQI is reported at the county level. A score of 0-50 is considered good; 51-100 is moderate; above 100 may be unhealthy for sensitive groups.
Median AQI
PM2.5 Daysi
0Ozone Daysi
200Drinking Wateri
SDWISPublic water systems registered to serve this area. Community systems (CWS) provide water to residents year-round. Violations indicate a system failed to meet federal drinking water standards.
Community Systemsi
21Active Systemsi
14Recent Violationsi
32Recent Violations (Last 5 Years)
HIGHLAND LAKE WATER COMPANY
LAKE COUNTY PW- HAWTHORN WOODS
LIBERTYVILLE
VERNON HILLS - LAKE CO PW
FOX LAKE HILLS SUBDIVISION - LAKE CO PW
WILDWOOD SUBDIVISION - LAKE CO PW
Historical Violations (Over 5 Years Ago)
LCPW - BROOKS FARM SUBDIVISION
LAKE CO. PW - ARDEN SHORES ESTATES
COUNTRYSIDE LAKE SUBDIVISION -LAKE CO PW
LCPW-KNOLLWOOD PWS
FOREST LAKE ADDITION - LAKE CO PW
GRANDWOOD PARK SUBDIVISION - LAKE CO PW
LCPW - HIGHLAND LAKE SUBDIVISION
LCPW - PEKARA SUBDIVISION
DEERING OAKS SUBDIVISION
Industrial Monitoringi
Contamination Sitesi
Contaminated sites tracked by the EPA and state agencies. Superfund sites are the most seriously contaminated locations. Brownfields are former industrial properties being cleaned up for reuse. LUST sites have confirmed leaks from underground storage tanks.