Air Quality
Good
Water Violations
68
Air quality in San Juan County is rated good with a median AQI of 46 (219 days measured in 2025). 4 community water systems serve the area, with 68 recent violations in the last 5 years.
Air Quality — San Juan 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
219Drinking 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
4Recent Violationsi
68Recent Violations (Last 5 Years)