Arsenic in Missouri Well Water

EPA Data 2025 · Risk Level: High

Avg Level

3.683 ppb

EPA Limit

10 ppb

% Above Limit

15.8%

Risk Level

high

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

Water Quality Details

Contaminant	Arsenic
Category	chemical
Average Level	3.683 ppb
Maximum Level	9.933 ppb
EPA Limit (MCL)	10 ppb
% Wells Above Limit	15.8%
Affected Wells	66,360
Testing Cost	$99
Treatment Cost	$1,409
vs National Avg	-0.560 ppb (-13.2%)

Missouri Well Water Overview

Well Users

420,000

% on Well Water

14.5%

Quality Score

65/100

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 Missouri well water?

In Missouri, arsenic levels average 3.683 ppb, with a maximum recorded level of 9.933 ppb. The EPA limit is 10 ppb. Currently 15.8% of tested wells exceed this limit, affecting approximately 66,360 wells.

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

Testing for arsenic in Missouri typically costs around $99. If treatment is needed, water treatment systems for arsenic cost approximately $1,409.

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

The risk level for arsenic in Missouri is rated as high. The state average of 3.683 ppb is 13.2% below the national average of 4.243 ppb.

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