Radon in North Carolina Well Water

EPA Data 2025 · Risk Level: Minimal

Avg Level

61.315 pCi/L

EPA Limit

300 pCi/L

% Above Limit

2.9%

Risk Level

minimal

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

Water Quality Details

Contaminant	Radon
Category	radiological
Average Level	61.315 pCi/L
Maximum Level	186.733 pCi/L
EPA Limit (MCL)	300 pCi/L
% Wells Above Limit	2.9%
Affected Wells	26,680
Testing Cost	$26
Treatment Cost	$306
vs National Avg	-76.727 pCi/L (-55.6%)

North Carolina Well Water Overview

Well Users

920,000

% on Well Water

18.5%

Quality Score

69/100

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 North Carolina well water?

In North Carolina, radon levels average 61.315 pCi/L, with a maximum recorded level of 186.733 pCi/L. The EPA limit is 300 pCi/L. Currently 2.9% of tested wells exceed this limit, affecting approximately 26,680 wells.

How much does it cost to test for radon in North Carolina?

Testing for radon in North Carolina typically costs around $26. If treatment is needed, water treatment systems for radon cost approximately $306.

What is the risk level of radon in North Carolina well water?

The risk level for radon in North Carolina is rated as minimal. The state average of 61.315 pCi/L is 55.6% below the national average of 138.042 pCi/L.

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