TapSafetyReport
F0/100

TUCSON CITY OF — Water Quality Report 2026

Serving 732,906 people · Arizona

Water Source
Groundwater
County
—
System ID
AZ0410112
Violations
2049

Contaminant Test Results

2 contaminants above EPA health goals
ContaminantDetectedLimit (MCL)Status
1,4-dioxane
4.70 µg/L—Above Goal
Lead (90th percentile)
< 0.001 mg/L0.015 mg/LAbove Goal

EPA Violation History

6

Violations (last 5yr)

0

Unresolved

0

Health-Related

TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2022 – December 31, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2022 – December 31, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2022 – December 31, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2022 – December 31, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2022 – December 31, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2022 – December 31, 2024Enforcement: Resolving — corrective action underway

Understanding violation severity

Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.

Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly

Frequently Asked Questions About TUCSON CITY OF

Is TUCSON CITY OF water safe to drink?

TUCSON CITY OF water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 2049 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has TUCSON CITY OF detected?

73 contaminants were tested in TUCSON CITY OF's water. Notable contaminants include Lead (90th percentile), 1,4-dioxane. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).

Does TUCSON CITY OF have any EPA violations?

Yes, TUCSON CITY OF has 2049 EPA violation(s) on record, with the most recent in 2022. Violation types include MR, Other, MCL. 1 are health-based violations.

How many people does TUCSON CITY OF serve?

TUCSON CITY OF serves approximately 732,906 people, Arizona. The system provides water to 1 community: Tucson.

What type of water does TUCSON CITY OF provide?

TUCSON CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is AZ0410112.

How does TUCSON CITY OF compare to other utilities in Arizona?

TUCSON CITY OF scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Arizona state page for a full comparison of water systems.

Cities Served

Tucson