Locations and reports
Radon in Washington, District of Columbia
EPA puts District of Columbia, where Washington is, in Zone 3, its lowest radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
- Predicted
- Zone 3Lower predicted potential
- Measured
8.7% of 2,126 tests reported to CDC for District of Columbia (2008 to 2017, laboratory) were at or above 4 pCi/L- Your home
- Test to knowNo area figure here is a reading of your home.
The data
Washington, What is published
What is published for Washington
Radon data is published by county, not by city
Radon data is published by county, not by city. EPA assigns radon zones to counties, and CDC publishes radon test figures by county. Neither publishes a figure for Washington, so every radon figure on this page belongs to a county and is labelled with it. Only a test tells you about one home.
District of Columbia has an EPA zone and its own CDC test figures, shown below. About 693,645 people live in Washington.
Washington, Counties
The county Washington lies in
MeasuredEach county's own EPA zone and its own published CDC figures for 2008 to 2017, laboratory, the newest period any of them has. A county without a figure for that period is shown without one, never with a figure from another year.
District of ColumbiaZone 3Lower predicted potential
- 8.7%
- Reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- 1.2 pCi/L
- Median reported result
- 2,126 tests
- Tests reported to CDC
- 0
- Annual years on file
The median reported pre-mitigation result for 2008 to 2017, laboratory was 1.2 pCi/L in District of Columbia.
CDC counts radon tests that were reported to it, not homes, and figures from few tests can swing widely from year to year. Each county’s report has its full history.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.
Radon Action Brief
National Radon Action MonthPre-sale
The radon brief for Washington, in one dated file.
- Your area's radon record, explained. EPA's zone and any CDC tests.
- Your plan to test this week. Which test, where it goes, how long.
- Fix costs and pros near you. Costs, EPA's checklist, listed pros.
Save 64%Sale price: $8.99Price after the sale: $25Ends Jan 31Then $25Sale ends January 31, then $25
Local help
Washington, Local resources
Local resources for Washington
Who to ask in District of Columbia: its radon program, test kits and professionals.
- Radon Test Kit ProgramDistrict of Columbia’s radon program answers questions about testing, mitigation and the rules where you live.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
District residents can obtain a free radon test kit to reduce prolonged exposure to harmful levels of radon in the home.
- Compare kits
- Professionals in District of ColumbiaRadon testers and mitigators in District of Columbia, each with how its listing was checked.
What District of Columbia's program says
- Phone
- (202) 535-2302
What it means
Washington, Questions
Questions about radon in Washington
What radon zone is Washington in?
EPA's Map of Radon Zones classifies counties, not cities. District of Columbia is in Zone 3 (lower predicted potential). A zone is a prediction for a whole county and never tells you the level in one home.
How many radon tests come back high in Washington's counties?
For 2008 to 2017, laboratory, the share of radon tests reported to CDC that were at or above 4 pCi/L was 8.7% in District of Columbia (2,126 tests). Each is that county's own figure, counting tests reported to CDC, not homes. Radon411 does not average or combine them into a figure for the city.
Should I test my home in Washington?
Yes. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. How to test a home.
The answers use the published figures of District of Columbia, the county Washington lies in.
Explore
Washington, Next steps
What to do next
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