Flagstaff, AZ water quality

Your utility

City of Flagstaff uses Free chlorine (plus a separate chemical, chlorine dioxide, used earlier in treatment to help control algae) for disinfection. Two paperwork violations in 2025 — a routine bacteria-testing report was turned in one business day late, and a revised water-treatment report was filed after its deadline. Both were fixed within a month; the city says all required sampling was done on time and there are no health concerns from either. (checked 2026-08-18). Read their full water quality report.

Who to contact

Your water bill and City of Flagstaff's water quality report list who to call with questions about your water.

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 Flagstaff, AZ

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

Rotten egg smell in other Arizona cities