Air Quality
Moderate
Water Violations
506
Air quality in Maricopa County is rated moderate with a median AQI of 71 (304 days measured in 2025). 20 community water systems serve the area, with 506 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
20Active Systemsi
21Recent Violationsi
506Recent Violations (Last 5 Years)
EPCOR - CHAPARRAL CITY
EPCOR - PARADISE VALLEY/SCOTTSDALE
EPCOR - HOLIDAY HARBOR
EL MIRAGE CITY OF
EPCOR- RIO VERDE
EPCOR - SUN CITY WEST
EPCOR - ANTHEM
EPCOR - NORTH EAST AGUA FRIA
EPCOR - AGUA FRIA
EPCOR - LAKE HAVASU
EPCOR - WILLOW VALLEY/KING STREET
EPCOR - WILLOW VALLEY/LAKE CIMARRON
EPCOR - TUBAC
EPCOR - MOOVALYA KEYS
EPCOR - MARINA VILLAGE
EPCOR - PARKER DAM
EPCOR - RIO LINDO
Historical Violations (Over 5 Years Ago)
EPCOR - TIERRA DEL RIO