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State overview
Radon in District of Columbia
Of District of Columbia's 1 counties and county equivalents, EPA places 1 in Zone 3. Zones are county-wide predictions; testing is the only way to know your home's level.
Radon in the news
District of Columbia stories
- Chart of the week: Distribution of radon in the District of ColumbiaD.C. Policy Center · 2023-06-23
Headlines link to the original publishers via Google News. Updated 2026-10-27.
All 1 counties
| County | EPA zone |
|---|---|
| District of Columbia | Zone 3 |
Source: EPA radon zones spreadsheet (EPA 402/A-16/001).