Across Tucson, EPA compliance records fall well below AZ averages — documented health-based violations affect multiple service areas, and the city's sustained low grade reflects a persistent pattern across reporting cycles.

Data: EPA SDWIS Last verified: 2026-06-03

Water Quality Map: Tucson, AZ

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Overview

We track water quality and home safety data for 54 ZIP codes in Tucson, Arizona, covering 14 community water systems serving approximately 916,333 people.

54 of 54 ZIP codes (100%) have recorded EPA violations. 1566 health-based violations documented.

Home Safety Score

Average Home Safety Score for Tucson: D (53/100)

The score combines three factors:

Factor	What It Measures
Water Quality	EPA violations and compliance history
Lead Levels	90th percentile lead concentration vs EPA action level
Radon Risk	EPA radon zone classification

Water Sources

Tucson water systems draw from: Groundwater, Surface water.

Lead & Copper

• Average lead level (90th percentile): 0.0006 mg/L (EPA action level: 0.015 mg/L)
• 0 ZIP codes exceed the EPA lead action level

Radon Risk

Dominant radon zone: Zone 2 (Moderate Risk)

• Zone 1 (High): 0 ZIP codes
• Zone 2 (Moderate): 54 ZIP codes
• Zone 3 (Low): 0 ZIP codes

The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.

Top Contaminants

Areas with Most Violations

All ZIP Codes in Tucson

• 85701 [C] — 218 violations ⚠
• 85702 [D] — 218 violations ⚠
• 85703 [D] — 218 violations ⚠
• 85704 [C] — 218 violations ⚠
• 85705 [D] — 218 violations ⚠
• 85706 [C] — 218 violations ⚠
• 85707 [D] — 218 violations ⚠
• 85708 [D] — 218 violations ⚠
• 85709 [D] — 218 violations ⚠
• 85710 [D] — 218 violations ⚠
• 85711 [C] — 218 violations ⚠
• 85712 [D] — 218 violations ⚠
• 85713 [C] — 218 violations ⚠
• 85714 [C] — 218 violations ⚠
• 85715 [D] — 218 violations ⚠
• 85716 [D] — 218 violations ⚠
• 85717 [D] — 218 violations ⚠
• 85718 [D] — 218 violations ⚠
• 85719 [D] — 218 violations ⚠
• 85720 [D] — 218 violations ⚠
• 85721 [D] — 218 violations ⚠
• 85722 [D] — 218 violations ⚠
• 85723 [D] — 218 violations ⚠
• 85724 [D] — 218 violations ⚠
• 85725 [D] — 218 violations ⚠
• 85726 [D] — 218 violations ⚠
• 85728 [D] — 218 violations ⚠
• 85730 [C] — 218 violations ⚠
• 85731 [D] — 218 violations ⚠
• 85732 [D] — 218 violations ⚠
• 85733 [D] — 218 violations ⚠
• 85734 [D] — 218 violations ⚠
• 85735 [D] — 218 violations ⚠
• 85736 [D] — 218 violations ⚠
• 85737 [D] — 218 violations ⚠
• 85739 [D] — 218 violations ⚠
• 85740 [D] — 218 violations ⚠
• 85741 [C] — 218 violations ⚠
• 85742 [D] — 218 violations ⚠
• 85743 [C] — 218 violations ⚠
• 85744 [D] — 218 violations ⚠
• 85745 [D] — 218 violations ⚠
• 85746 [C] — 218 violations ⚠
• 85747 [D] — 218 violations ⚠
• 85748 [C] — 218 violations ⚠
• 85749 [D] — 218 violations ⚠
• 85750 [D] — 218 violations ⚠
• 85751 [D] — 218 violations ⚠
• 85752 [D] — 218 violations ⚠
• 85754 [D] — 218 violations ⚠
• 85755 [C] — 218 violations ⚠
• 85756 [D] — 218 violations ⚠
• 85757 [D] — 218 violations ⚠
• 85775 [D] — 218 violations ⚠

Data Sources

• Water quality: EPA Safe Drinking Water Information System (SDWIS)
• Lead/copper: EPA Lead and Copper Rule sampling data
• Radon: EPA Map of Radon Zones

Updated daily.

Tucson: Remediation Cost in Perspective

Given current Tucson valuations, the remediation-to-property-value ratio is low — most homeowners are looking at a proportionally modest share that fits within routine financial planning.

Median Home Value

$300,900

Est. Remediation

$2,006

Remediation as % of home value 0.7%

Remediation costs in Tucson are relatively low compared to home values. The $956–$3,789 estimated range is a small fraction of median property value. Home values are 2% below the Arizona average.

Protecting Children from Lead in Tucson

0.0006

mg/L Avg Lead (Limit: 0.015)

Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.

Lead risk in Tucson appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.

Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.

Climate-Related Water Risk for Tucson

Flood claims in Tucson number 526 under the NFIP, and 54% of ZIP codes fall within FEMA-designated zones — together reflecting a community where flooding is a recurring, significant feature of the local risk environment with direct implications for periodic water supply safety.

526

Total FEMA Flood Claims

$13,155

Avg Claim Payout

54%

ZIPs in FEMA Flood Zones

~26

Est. Claims/Year

Tucson has a significant flood history with 526 FEMA flood insurance claims on record, averaging $13,155 per claim. With 54% of ZIP codes in FEMA-designated flood zones, flood risk is a major concern for homeowners and water quality.

How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,006</strong> remediation cost per household.

Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.

Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.