Home › Connecticut
State overview
Radon in Connecticut
Of Connecticut's 8 counties and county equivalents, EPA places 4 in Zone 1, 3 in Zone 2, 1 in Zone 3. Zones are county-wide predictions; testing is the only way to know your home's level.
Radon in the news
Connecticut stories
- Radon ConnecticutAmerican Lung Association · 2024-01-09
Headlines link to the original publishers via Google News. Updated 2026-10-27.
All 8 counties
| County | EPA zone |
|---|---|
| Fairfield County | Zone 1 |
| Hartford County | Zone 3 |
| Litchfield County | Zone 2 |
| Middlesex County | Zone 1 |
| New Haven County | Zone 1 |
| New London County | Zone 1 |
| Tolland County | Zone 2 |
| Windham County | Zone 2 |
Source: EPA radon zones spreadsheet (EPA 402/A-16/001).