Mercury in Missouri Well Water

EPA Data 2025 · Risk Level: Low

Avg Level

0.761 ppb

EPA Limit

2 ppb

% Above Limit

7.6%

Risk Level

low

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

Water Quality Details

Contaminant	Mercury
Category	metal
Average Level	0.761 ppb
Maximum Level	2.591 ppb
EPA Limit (MCL)	2 ppb
% Wells Above Limit	7.6%
Affected Wells	31,920
Testing Cost	$130
Treatment Cost	$4,594
vs National Avg	-0.162 ppb (-17.5%)

Missouri Well Water Overview

Well Users

420,000

% on Well Water

14.5%

Quality Score

65/100

Highest Risk States for Mercury

#1Kentucky18.2% above limit #2Arkansas17.3% above limit #3New Mexico17.3% above limit #4Michigan15.8% above limit #5Minnesota14.3% 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 mercury a problem in Missouri well water?

In Missouri, mercury levels average 0.761 ppb, with a maximum recorded level of 2.591 ppb. The EPA limit is 2 ppb. Currently 7.6% of tested wells exceed this limit, affecting approximately 31,920 wells.

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

Testing for mercury in Missouri typically costs around $130. If treatment is needed, water treatment systems for mercury cost approximately $4,594.

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

The risk level for mercury in Missouri is rated as low. The state average of 0.761 ppb is 17.5% below the national average of 0.923 ppb.

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