Phoenix, AZ water quality

Your utility

City of Phoenix uses Chlorine (chlorine dioxide is also used earlier in treatment) for disinfection. No health-based violations recently — the last one on record was a single turbidity (water clarity) issue in January 2021, resolved within two weeks. In May 2025 they came up one routine bacteria sample short (359 of 360) and missed some required treatment-plant monitoring. No E. coli was found, and the state marked both resolved — the last in April 2026. (checked 2026-10-08). Read their full water quality report.

Where the water comes from

About 97–99% of Phoenix's tap water in 2025 was treated surface water from the Salt, Verde and Colorado rivers — Salt and Verde water arrives through the Salt River Project canals, Colorado River water through the Central Arizona Project aqueduct. The remaining ~2% came from about 20 city-operated groundwater wells. Every source is disinfected with chlorine before it reaches your tap. (Source: City of Phoenix 2025 Water Quality Report.)

Who to contact

City of Phoenix: 602-262-6251 (Weekdays, 8 a.m.–5 p.m.) or WSDCompliance@phoenix.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 Phoenix, AZ

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

Rotten egg smell in other Arizona cities