Air Quality
Good
Water Violations
None
Active Contamination
253
Active Permits
14
Air quality in Winnebago County is rated good with a median AQI of 41 (263 days measured in 2025). 0 community water systems serve the area with a clean compliance record. 50 industrial facilities report toxic chemical releases totaling 22.1K lbs. 597 contamination sites are tracked, including 118 open leaking tank incidents.
Air Quality — Winnebago 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
140Ozone Daysi
123Drinking 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
0Active Systemsi
0Recent Violationsi
0Industrial 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.