Radon in Montana Well Water

EPA Data 2025 · Risk Level: Low

Avg Level

136.481 pCi/L

EPA Limit

300 pCi/L

% Above Limit

6.5%

Risk Level

low

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

Water Quality Details

Contaminant	Radon
Category	radiological
Average Level	136.481 pCi/L
Maximum Level	657.62 pCi/L
EPA Limit (MCL)	300 pCi/L
% Wells Above Limit	6.5%
Affected Wells	11,700
Testing Cost	$121
Treatment Cost	$4,626
vs National Avg	-1.561 pCi/L (-1.1%)

Montana Well Water Overview

Well Users

180,000

% on Well Water

28.2%

Quality Score

76/100

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 Montana well water?

In Montana, radon levels average 136.481 pCi/L, with a maximum recorded level of 657.62 pCi/L. The EPA limit is 300 pCi/L. Currently 6.5% of tested wells exceed this limit, affecting approximately 11,700 wells.

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

Testing for radon in Montana typically costs around $121. If treatment is needed, water treatment systems for radon cost approximately $4,626.

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

The risk level for radon in Montana is rated as low. The state average of 136.481 pCi/L is 1.1% below the national average of 138.042 pCi/L.

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