Air Quality
Good
Water Violations
None
Active Permits
9
Air quality in Union County is rated good with a median AQI of 45 (180 days measured in 2025). 0 community water systems serve the area with a clean compliance record. 11 industrial facilities report toxic chemical releases totaling 52 lbs.
Air Quality — Union 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
131Ozone Daysi
0Drinking 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
1Recent Violationsi
0