Tucson City of, AZ Water Quality
Tucson City of: EPA violation history, explained
Tucson 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: 732,906, over 191,264 connections.
How this compares nationally
Tucson City of has 2,076 violations on record in total, 1 of them health-based - ranking it 7,067th of 12,903 systems by violation count, the 45th percentile nationally.
Against the AZ average
Among the 210 AZ systems in this dataset, the average is 8.0 health-based violations - Tucson City of's 1 is at or below that. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
Tucson City of's most recent violation on record is dated 2026-01-01, with the most recent health-based one dated 1981-07-11. Last reported to EPA: 05/14/2026.
The concern categories on record
Tucson 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:
- Nitrate / nitrite - flagged from: Nitrate
The most severe category on record is nitrate / nitrite, which points toward a reverse osmosis-class filter if you want to address it directly.
What Tucson City of's record does not cover
Everything on this page is Tucson City of's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. This record - 1 health-based violation on file for Tucson 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.