San Tan Valley

San Tan Valley, AZ receives a water quality score of 52/100 (Grade D) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 2 public water systems serving the area.

San Tan Valley's water quality score is below the national average, indicating a history of EPA violations or elevated contaminant levels. Residents are encouraged to check their specific water system report and consider additional filtration.

San Tan Valley's score of 52 is 5 points below the Arizona state average of 57, and below the nationwide average of roughly 78/100 across all U.S. states.

Nestled in the arid Desert Southwest, San Tan Valley faces the distinct challenge of securing drinking water as a mid-size city in a fast-growing, groundwater-dependent region of Arizona. For prospective homebuyers looking at the area, the local water supply's poor evaluation signals that the infrastructure struggles to meet standard quality expectations. With service divided between a couple of distinct distribution systems, residents must navigate a supply network under stress from regional dry conditions, making ongoing awareness of local tap quality a practical necessity.

Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our Arizona water quality rankings report →