Radon in Pennsylvania Well Water

EPA Data 2025 · Risk Level: Low

Avg Level

202.535 pCi/L

EPA Limit

300 pCi/L

% Above Limit

4.3%

Risk Level

low

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

Water Quality Details

Contaminant	Radon
Category	radiological
Average Level	202.535 pCi/L
Maximum Level	951.391 pCi/L
EPA Limit (MCL)	300 pCi/L
% Wells Above Limit	4.3%
Affected Wells	77,400
Testing Cost	$89
Treatment Cost	$3,293
vs National Avg	+64.493 pCi/L (+46.7%)

Pennsylvania Well Water Overview

Well Users

1,800,000

% on Well Water

19.5%

Quality Score

72/100

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 Pennsylvania well water?

In Pennsylvania, radon levels average 202.535 pCi/L, with a maximum recorded level of 951.391 pCi/L. The EPA limit is 300 pCi/L. Currently 4.3% of tested wells exceed this limit, affecting approximately 77,400 wells.

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

Testing for radon in Pennsylvania typically costs around $89. If treatment is needed, water treatment systems for radon cost approximately $3,293.

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

The risk level for radon in Pennsylvania is rated as low. The state average of 202.535 pCi/L is 46.7% above the national average of 138.042 pCi/L.

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