Radon Levels in Delaware

3 counties — 0 high risk, 1 moderate, 2 low risk

1
2
Zone 1 High (0.0%) Zone 2 Moderate (33.3%) Zone 3 Low (66.7%)

Delaware Radon Zone Map

Counties colored by EPA radon zone. Red = Zone 1, Orange = Zone 2, Green = Zone 3.

Check Your Delaware ZIP Code

All 3 Counties — By Radon Risk

CountyEPA ZoneTests% Above 4 pCi/L
New Castle Moderate 103 31.1%
Kent Low 31 32.3%
Sussex Low 55 38.2%

Sources: EPA Map of Radon Zones, CDC Environmental Health Tracking Network

Frequently Asked Questions

How many counties in Delaware have high radon risk?

Delaware has 0 counties classified as EPA Zone 1 (high radon risk), 1 as Zone 2 (moderate), and 2 as Zone 3 (low risk).

Is radon a problem in Delaware?

The EPA recommends all homes in Delaware be tested for radon, regardless of which zone they're in.

How do I check radon levels for my Delaware address?

Enter your ZIP code in the search box above to see your county's EPA radon zone and available testing data. For your specific home's radon level, you'll need a radon test kit.