Arsenic in Arizona Well Water

EPA Data 2025 · Risk Level: Moderate

Avg Level

5.506 ppb

EPA Limit

10 ppb

% Above Limit

9.2%

Risk Level

moderate

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

Water Quality Details

Contaminant	Arsenic
Category	chemical
Average Level	5.506 ppb
Maximum Level	17.718 ppb
EPA Limit (MCL)	10 ppb
% Wells Above Limit	9.2%
Affected Wells	25,760
Testing Cost	$145
Treatment Cost	$4,474
vs National Avg	+1.263 ppb (+29.8%)

Arizona Well Water Overview

Well Users

280,000

% on Well Water

7.2%

Quality Score

72/100

Highest Risk States for Arsenic

#1Iowa17.4% above limit #2Georgia15.8% above limit #3Missouri15.8% above limit #4Alabama15.4% above limit #5Colorado14.0% 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 arsenic a problem in Arizona well water?

In Arizona, arsenic levels average 5.506 ppb, with a maximum recorded level of 17.718 ppb. The EPA limit is 10 ppb. Currently 9.2% of tested wells exceed this limit, affecting approximately 25,760 wells.

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

Testing for arsenic in Arizona typically costs around $145. If treatment is needed, water treatment systems for arsenic cost approximately $4,474.

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

The risk level for arsenic in Arizona is rated as moderate. The state average of 5.506 ppb is 29.8% above the national average of 4.243 ppb.

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