Mesa, AZ water quality

Your utility

City of Mesa uses Chlorine (chlorine dioxide or ozone is also used during treatment, depending on the plant) for disinfection. No health-based violations found. In 2025 they had two monitoring violations — a disinfection-byproduct (bromate) check in February–March and required bacteria testing in August weren't completed as required. The state marked both resolved by October 2025. (checked 2026-10-08). Read their full water quality report.

Where the water comes from

Where Mesa's water comes from depends on where you live. The City Zone mostly gets Salt and Verde river water through the Salt River Project, treated at the Val Vista plant (about 40% of Mesa's water in 2025). The Eastern and Southern Zones mostly get Colorado River water through the Central Arizona Project (about 52%). The other ~8% came from 34 deep aquifer wells, usually blended with surface water — though at certain times of year some City Zone customers receive only well water. (Source: City of Mesa 2025 Water Quality Report.)

Who to contact

City of Mesa: 480-644-6461 or water.quality@mesaaz.gov. If a smell is in both hot and cold water, from every tap, and doesn't clear after running the water, that's worth telling them.

How this check worksSources checked Oct 2026

Causes and what people typically do are based on published guidance from the EPA and state drinking-water programs, not guesses. The zip lookup pulls from EPA's public violation records (SDWIS) and a utility's own water quality report, hand-checked utility by utility rather than scraped.

This tool provides general information based on published EPA and utility data, and common causes reported by water quality professionals. It is not a substitute for laboratory water testing, a licensed plumber's assessment, or guidance from your water utility or local health department. WaterCheck does not guarantee the accuracy, completeness, or timeliness of the information provided and is not liable for decisions made based on it.

Who checks this, and how

Common smells in Mesa, AZ

What each smell usually means, with City of Mesa's record alongside:

Rotten egg smell in other Arizona cities