Air Quality
Moderate
Water Violations
26
Air quality in Maricopa County is rated moderate with a median AQI of 71 (304 days measured in 2025). 28 community water systems serve the area, with 26 recent violations in the last 5 years.
Air Quality — Maricopa 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
37Ozone Daysi
190Drinking 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
28Active Systemsi
18Recent Violationsi
26Recent Violations (Last 5 Years)
Historical Violations (Over 5 Years Ago)