Radon in Massachusetts Well Water

EPA Data 2025 · Risk Level: Low

Avg Level

142.193 pCi/L

EPA Limit

300 pCi/L

% Above Limit

5.0%

Risk Level

low

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

Water Quality Details

Contaminant	Radon
Category	radiological
Average Level	142.193 pCi/L
Maximum Level	574.956 pCi/L
EPA Limit (MCL)	300 pCi/L
% Wells Above Limit	5.0%
Affected Wells	21,000
Testing Cost	$135
Treatment Cost	$2,488
vs National Avg	+4.151 pCi/L (+3.0%)

Massachusetts Well Water Overview

Well Users

420,000

% on Well Water

14.2%

Quality Score

79/100

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 Massachusetts well water?

In Massachusetts, radon levels average 142.193 pCi/L, with a maximum recorded level of 574.956 pCi/L. The EPA limit is 300 pCi/L. Currently 5.0% of tested wells exceed this limit, affecting approximately 21,000 wells.

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

Testing for radon in Massachusetts typically costs around $135. If treatment is needed, water treatment systems for radon cost approximately $2,488.

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

The risk level for radon in Massachusetts is rated as low. The state average of 142.193 pCi/L is 3.0% above the national average of 138.042 pCi/L.

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