Air Qualityi
Water Systemsi
Water Violationsi
42TRI Facilitiesi
Active NPDESi
Air Quality — Madison 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
164Ozone Daysi
137Drinking 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
47Active Systemsi
48Recent Violationsi
42Recent Violations (Last 5 Years)
Historical Violations (Over 5 Years Ago)
IL AMERICAN-ROLLINS
IL AMERICAN-HARDIN
IL AMERICAN-MORELAND
IL AMERICAN-MIDWEST PALOS
IL AMERICAN-CHICAGO SUBURBAN
IL AMERICAN-DUPAGE UTILITY
IL AMERICAN-ARROWHEAD
IL AMERICAN-FARMINGTON
IL AMERICAN-NETTLE CREEK
IL AMERICAN-LIVINGSTON
IL AMERICAN-GRANITE CITY
IL AMERICAN-GLASFORD
IL AMERICAN-PEORIA
IL AMERICAN-PEKIN
IL AMERICAN-WASHINGTON ESTATES
IL AMERICAN-HOMER TOWNSHIP
IL AMERICAN-HOLLIS
IL AMERICAN-LEONORE
IL AMERICAN-STREATOR
IL AMERICAN-SAUNEMIN
IL AMERICAN-PONTIAC
IL AMERICAN-MOUNT PULASKI
IL AMERICAN-ANDALUSIA
IL AMERICAN-EAST ST LOUIS
IL AMERICAN-CENTRAL STATES DST
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
13Expired / Terminatedi
13Nearest Hazardous Waste Disposal Facilitiesi
RCRAThese are the closest licensed facilities where hazardous waste (chemicals, solvents, industrial byproducts) can be legally treated, stored, or disposed of. There are only about 15 such facilities in all of Illinois.
Leaking 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 (9)