Radon levels in District of Columbia

Verified county-level radon indicators are available for 1 District of Columbia counties. Select a county for its source period and sample details.

Share of radon tests at or above 4 pCi/L in District of ColumbiaShare of tests at or above 4 pCi/L by county · Radon test results from laboratories, 2008–2017 · 1 of 1 counties have data
District of Columbia : 9% of tests at or above 4 pCi/L · 2,126 tests
  • Under 10%
  • 10–20%
  • 20–30%
  • 30–40%
  • 40% or more
  • No data

Counties

CountyTests% ≥ 4 pCi/LMedian (pCi/L)EPA zone (1993)Source
District of Columbia 2,1269%1.2Zone 3Radon test results from laboratories through 2017

Test your home

County figures show how often tests come back high, not the level in your home. Only a test tells you that: see how to test for radon.

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