Phoenix City of, AZ Water Quality
Phoenix City of: EPA violation history, explained
Phoenix City of has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 1,695,000, over 430,118 connections.
Phoenix City of's record against the rest of the country
76 total violations and 3 health-based ones put Phoenix City of at the 63th percentile nationally for violation burden, rank 4,738 of 12,903.
How Phoenix City of compares within AZ
Phoenix City of's 3 health-based violations sit within the AZ average of 8.0, across 210 systems statewide. See the lead and copper guide for why lead counts differently.
Most recent violation on record
The last violation EPA has on record for Phoenix City of is from 2025-01-05 (health-based: 2021-01-01). Last reported to EPA: 05/14/2026.
What kind of problem, specifically
Phoenix City of's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Microbial contamination / treatment technique - flagged from: Coliform (TCR); Interim Enhanced Surface Water Treatment Rule
- Synthetic organic chemicals / pesticides / VOCs - flagged from: Trichloroethylene
The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.
What this data is and is not
This is what Phoenix City of reported to its state primacy agency and EPA under the Safe Drinking Water Act - real regulatory record, not a lab test of your specific tap. This record - 3 health-based violations on file for Phoenix City of - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.