Air Qualityi
Water Systemsi
Water Violationsi
9TRI Facilitiesi
Active NPDESi
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. Transient systems serve places like gas stations or restaurants. Violations indicate a system failed to meet federal drinking water standards.
Community Systemsi
2Active Systemsi
2Recent Violationsi
9Recent Violations (Last 5 Years)
DEERFIELD
Historical Violations (Over 5 Years Ago)
WINNETKA
Toxic Release Inventory (TRI)i
TRIFactories, refineries, and other industrial facilities that use or store hazardous chemicals are required to report their releases annually to the EPA. Being listed here does not mean a violation occurred — it means the facility is transparently tracking its chemical usage.
Reporting Facilitiesi
1With Chemical Datai
0Wastewater & Stormwater Permits (NPDES)i
NPDESUnder the Clean Water Act, any facility that discharges wastewater or stormwater into rivers, lakes, or streams must hold an NPDES permit. "Effective" means the permit is currently active and the facility is authorized to discharge under its permit conditions.
Active Permitsi
11Expired / Terminatedi
9Leaking Underground Storage Tanksi
IL EPAUnderground storage tanks (commonly at gas stations) can leak fuel and chemicals into soil and groundwater. "Open" means the leak is still being investigated or cleaned up. "Closed" means the site received a No Further Remediation (NFR) letter — cleanup is done.
Open Incidents (22)