Water quality · AZ

Arizona Water Quality (2026)

An estimated 6M+ residents affected by contamination. Up to 670 utilities reported elevated nitrate, arsenic and chromium-6.

Our Arizona coverage focuses on the 2 metros below: Phoenix, Tucson. Each city page lists the utility's water source, hardness in grains per gallon, any contaminants flagged above EWG's stricter health guideline, and the whole-house system type that matches that specific profile, not a generic recommendation copied across the state.

If your Arizona city is not in the list yet, the nearest covered metro is usually a reasonable proxy: regional source water and treatment plants are typically shared across nearby municipalities. Private wells in Arizona are a different story and need a mail-in lab panel, the utility CCR will not apply.

Sources: Clearly Filtered 2025