Skip to content
lung.com

Radon zones in District of Columbia

The EPA assigns every county in District of Columbia to one of three radon potential zones. No county in District of Columbia is in Zone 1. That is a statement about predicted county averages, not about any individual home - homes above the action level are found in all three zones.

1
Counties
0
Zone 1 counties
Predicted average above 4 pCi/L
0
Zone 2 counties
Predicted average 2-4 pCi/L
1
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across District of Columbia

Every county in District of Columbia, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 0Zone 2 · 0Zone 3 · 1

Hover a county · click to open it

County by county

All 1 District of Columbia counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
District of Columbia3679k4.0%9.4%26.0

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Other states

Radon zones elsewhere