TapSafetyReport
F12/100

Tucson Tap Water Quality: Is It Safe to Drink? (2026 Report)

Serving 874,719 residents · Arizona

What's In Tucson's Tap Water?

73
Contaminants Tested
0
Exceed EPA Limits
2
Above EPA Goals
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

Water Utility Details

LORD AZ WATER 2 - WINCHESTER TRAILS
Population Served

1,304

Water Source

Groundwater

System ID

AZ0401047

CEDAR GROVE WATER COMPANY
Population Served

1,564

Water Source

Groundwater

System ID

AZ0401049

SOUTHLAND UTILITIES - GOLDEN ACRES
Population Served

1,614

Water Source

Groundwater

System ID

AZ0402029

TOWN OF HUACHUCA CITY
Population Served

1,750

Water Source

Groundwater

System ID

AZ0402019

WATCO WATER
Population Served

1,153

Water Source

Groundwater

System ID

AZ0409049

AVRA WATER COOP INC
Population Served

6,685

Water Source

Groundwater

System ID

AZ0410006

VOYAGER WATER COMPANY
Population Served

3,209

Water Source

Groundwater

System ID

AZ0410035

FLOWING WELLS IRRIGATION DISTRICT
Population Served

16,000

Water Source

Groundwater

System ID

AZ0410051

METROPOLITAN DWID - HUB
Population Served

4,252

Water Source

Groundwater

System ID

AZ0410060

METROPOLITAN DWID
Population Served

45,570

Water Source

Groundwater

System ID

AZ0410076

MARANA MUNICIPAL - PICTURE ROCKS
Population Served

5,278

Water Source

Groundwater

System ID

AZ0410092

TUCSON CITY OF
Population Served

732,906

Water Source

Groundwater

System ID

AZ0410112

SPANISH TRAIL WATER COMPANY
Population Served

3,822

Water Source

Groundwater

System ID

AZ0410127

RAY WATER COMPANY INC
Population Served

4,495

Water Source

Groundwater

System ID

AZ0410095

TUCSON WATER CORONA DE TUCSON
Population Served

10,217

Water Source

Groundwater

System ID

AZ0410169

SAGUARO WATER COMPANY
Population Served

3,243

Water Source

Groundwater

System ID

AZ0410177

MARANA MUNICIPAL - AIRLINE LAMBERT
Population Served

4,568

Water Source

Groundwater

System ID

AZ0410138

QUAIL CREEK WATER COMPANY
Population Served

6,812

Water Source

Groundwater

System ID

AZ0410262

MARANA MUNICIPAL - HARTMAN VISTAS
Population Served

5,248

Water Source

Groundwater

System ID

AZ0410329

METROPOLITAN DWID - DIABLO VILLAGE
Population Served

5,542

Water Source

Groundwater

System ID

AZ0410357

GOODMAN WATER COMPANY
Population Served

2,656

Water Source

Groundwater

System ID

AZ0411130

VALLE VERDE WATER COMPANY - EAST
Population Served

2,331

Water Source

Groundwater

System ID

AZ0412009

ADOC TUCSON
Population Served

4,500

Water Source

Groundwater

System ID

AZ0420557

Frequently Asked Questions About Tucson Water

Is Tucson tap water safe to drink?

Tucson, Arizona tap water receives a grade of F (12/100), which is considered failing. 4 contaminant(s) exceed EPA maximum contaminant levels and 6097 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.

What contaminants are in Tucson's water?

Of the 77 contaminants tested in Tucson's water supply, the most notable include PFOS, PFHxS, PFOA, Copper (90th percentile), Lead (90th percentile). 4 contaminant(s) exceed EPA legal limits (MCLs). 7 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.

Does Tucson have any water quality violations?

Yes, Tucson has 6097 EPA violation(s) on record, with the most recent in 2025. Violation types include MON, MR, Other. 63 of these are health-based violations, which are the most serious category.

Do I need a water filter in Tucson?

Based on EPA data, using a water filter in Tucson is recommended. 4 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.

Where does Tucson's tap water come from?

Tucson's drinking water is sourced from groundwater and supplied by LORD AZ WATER 2 - WINCHESTER TRAILS and 22 other water system(s). The system serves approximately 874,719 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.

How often is Tucson's water tested?

Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Tucson's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.

How does Tucson's water compare to other cities in Arizona?

Tucson's water quality score of 12/100 earns a grade of F, which is considered failing. This is a concerning score that suggests significant water quality issues. Visit our Arizona state page to see how all cities in the state compare.

What should I do if I'm concerned about Tucson's water quality?

If you have concerns about Tucson's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (LORD AZ WATER 2 - WINCHESTER TRAILS) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.

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