Radon in Arizona Well Water

EPA Data 2025 · Risk Level: Moderate

Avg Level

58.602 pCi/L

EPA Limit

300 pCi/L

% Above Limit

8.2%

Risk Level

moderate

Live DataLast updated: April 4, 2026·Source: EPA SDWIS & USGS

Water Quality Details

Contaminant	Radon
Category	radiological
Average Level	58.602 pCi/L
Maximum Level	215.37 pCi/L
EPA Limit (MCL)	300 pCi/L
% Wells Above Limit	8.2%
Affected Wells	22,960
Testing Cost	$75
Treatment Cost	$3,495
vs National Avg	-79.440 pCi/L (-57.5%)

Arizona Well Water Overview

Well Users

280,000

% on Well Water

7.2%

Quality Score

72/100

Highest Risk States for Radon

#1Kentucky17.2% above limit #2Arkansas16.3% above limit #3Louisiana15.6% above limit #4South Dakota14.4% above limit #5Georgia14.3% above limit

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EPA SDWIS & USGS

📊

WellWaterPeek Research TeamData Specialists

Our team analyzes data from EPA SDWIS & USGS to deliver accurate, up-to-date information. All data is verified and cross-referenced with official sources.

✓ EPA SDWIS & USGS✓ Updated 2025

Frequently Asked Questions

Is radon a problem in Arizona well water?

In Arizona, radon levels average 58.602 pCi/L, with a maximum recorded level of 215.37 pCi/L. The EPA limit is 300 pCi/L. Currently 8.2% of tested wells exceed this limit, affecting approximately 22,960 wells.

How much does it cost to test for radon in Arizona?

Testing for radon in Arizona typically costs around $75. If treatment is needed, water treatment systems for radon cost approximately $3,495.

What is the risk level of radon in Arizona well water?

The risk level for radon in Arizona is rated as moderate. The state average of 58.602 pCi/L is 57.5% below the national average of 138.042 pCi/L.

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