Radon levels in District of Columbia: Low
The model predicts a population-weighted basement average of 1.1 pCi/L across District of Columbia's 1 counties - about 42% below the US average of 1.8 pCi/L. Above-ground floors average 0.8 pCi/L.
Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.
0 / 1
EPA Zone 1 counties (0%)
0 / 1
Zone 2 / Zone 3 counties
0
counties predicted ≥ 4 pCi/L
0%
of ZIP codes predicted ≥ 4 pCi/L
District of Columbia counties by predicted radon
Sorted highest to lowest predicted basement average. 1 counties.
| County | Predicted basement | Upstairs | Grade | EPA zone | ZIPs |
|---|---|---|---|---|---|
| District of Columbia | 1.1 pCi/L | 0.8 | Low | EPA Zone 3 | 22 |
District of Columbia radon questions
- Is radon high in District of Columbia?
- District of Columbia's population-weighted predicted basement average is 1.1 pCi/L, about 42% below the US average of 1.8. 0 of its 1 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 0 are in the 2-4 "consider fixing" range and 1 are below 2. 0% of District of Columbia ZIP codes are predicted at 4 or higher.
- Which District of Columbia county has the highest radon?
- District of Columbia has the highest predicted basement average in District of Columbia at 1.1 pCi/L (EPA Zone 3). The lowest is District of Columbia at 1.1 pCi/L. These are modeled area averages; individual homes in any county can test far higher.
- How many EPA Zone 1 counties are in District of Columbia?
- 0 of District of Columbia's 1 counties (0%) are EPA Zone 1 (highest potential), 0 are Zone 2 and 1 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.
- Should I test for radon in District of Columbia?
- Yes. Even though District of Columbia's predicted average is below 2 pCi/L, the EPA recommends every home be tested - radon varies house to house, and 0% of District of Columbia ZIP codes are still predicted at 2 pCi/L or higher.
District of Columbia radon program
Many states offer free or discounted test kits and keep lists of certified mitigators. Find the District of Columbia radon office through the EPA state radon contacts page. Then read how to test and what mitigation costs.