Air Quality
Good
Water Violations
5
Active Permits
40
Air quality in Union County is rated good with a median AQI of 41 (184 days measured in 2025). 2 community water systems serve the area, with 5 recent violations in the last 5 years.
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
0Ozone Daysi
184Drinking 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
2Active Systemsi
17Recent Violationsi
5Recent Violations (Last 5 Years)
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