Radon in New Hampshire Well Water

EPA Data 2025 · Risk Level: Minimal

Avg Level

48.598 pCi/L

EPA Limit

300 pCi/L

% Above Limit

2.6%

Risk Level

minimal

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

Water Quality Details

Contaminant	Radon
Category	radiological
Average Level	48.598 pCi/L
Maximum Level	186.987 pCi/L
EPA Limit (MCL)	300 pCi/L
% Wells Above Limit	2.6%
Affected Wells	8,840
Testing Cost	$66
Treatment Cost	$4,232
vs National Avg	-89.444 pCi/L (-64.8%)

New Hampshire Well Water Overview

Well Users

340,000

% on Well Water

39.8%

Quality Score

75/100

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 New Hampshire well water?

In New Hampshire, radon levels average 48.598 pCi/L, with a maximum recorded level of 186.987 pCi/L. The EPA limit is 300 pCi/L. Currently 2.6% of tested wells exceed this limit, affecting approximately 8,840 wells.

How much does it cost to test for radon in New Hampshire?

Testing for radon in New Hampshire typically costs around $66. If treatment is needed, water treatment systems for radon cost approximately $4,232.

What is the risk level of radon in New Hampshire well water?

The risk level for radon in New Hampshire is rated as minimal. The state average of 48.598 pCi/L is 64.8% below the national average of 138.042 pCi/L.

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