Air Quality
Good
Water Violations
33
Active Contamination
23
Active Permits
26
Air quality in McLean County is rated good with a median AQI of 44 (273 days measured in 2025). 4 community water systems serve the area, with 33 recent violations in the last 5 years. 4 industrial facilities report toxic chemical releases totaling 4.4K lbs. 75 contamination sites are tracked, including 23 open leaking tank incidents. 34 EV charging stations are available in the area.
Air Quality — McLean 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
137Ozone Daysi
136Drinking 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
4Active Systemsi
5Recent Violationsi
33Recent Violations (Last 5 Years)
Historical Violations (Over 5 Years Ago)
NORMAL
Industrial Monitoringi
Toxic Release Inventory (TRI)i
TRIContamination 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.
EV Charging & Alternative Fuel Stationsi
AFDC