Unknown Risk

ZIP Code 20012

District of Columbia County, District of Columbia — Washington

23.4%Above action level

What You Should Do

1
Testing is still recommended. Even in low-risk zones, individual homes can have elevated radon due to localized geology, foundation type, and construction factors.
2
If your result is below 2.0 pCi/L, no action is needed. Re-test every 2–5 years, or after major renovations that alter your foundation or ventilation.
3
If your result is 4.0 pCi/L or above, install a mitigation system — even in low-risk zones, some homes require active radon reduction.

EPA Zone Details

ZIP Code20012
CountyDistrict of Columbia
CityWashington
StateDistrict of Columbia (DC)

Source: EPA Map of Radon Zones

CDC Testing Data

Homes Tested107
Above 4.0 pCi/L25
% Exceeding Action Level23.4%

Source: CDC Environmental Health Tracking Network

Radon & Your Basement in District of Columbia County

District of Columbia County is in EPA Zone 3, the lowest risk category. However, basements in any zone can have elevated radon due to local soil conditions, foundation cracks, and construction factors.

Radon concentrations are typically highest in the lowest level of a home. However, radon does not stay confined to the basement — it migrates to upper floors through stairways, HVAC ducts, and gaps in flooring. Even if your basement is unfinished or rarely used, elevated radon there can affect the air quality on your main living floors. Always test on the lowest livable level.

District of Columbia County Radon Map

Counties colored by EPA radon zone. Red = Zone 1 (high), Orange = Zone 2 (moderate), Green = Zone 3 (low).

Check Another ZIP Code

Nearby ZIP Codes

20009 Washington, DC Unknown 20010 Washington, DC Unknown 20011 Washington, DC Unknown 20013 District of Columbia, DC Unknown 20015 Washington, DC Unknown

Frequently Asked Questions

What is the radon risk level for ZIP code 20012?

ZIP code 20012 is in District of Columbia County, District of Columbia, which is classified as EPA Radon Zone ? (unknown risk). The predicted average indoor radon level is not available pCi/L.

Should I test for radon in 20012?

Yes. The EPA recommends testing all homes for radon regardless of zone. Even in lower-risk areas like 20012, individual homes can have elevated radon.

What county is ZIP code 20012 in?

ZIP code 20012 is in District of Columbia County, District of Columbia (DC).

Is it safe to live in ZIP code 20012?

ZIP code 20012 is in a lower-risk EPA Zone 3 area. Most homes in this zone have radon levels below the action level. However, the EPA still recommends testing, as individual homes can have elevated levels due to local geology.

Does radon in the basement affect upper floors in District of Columbia County?

Yes. Radon enters through the foundation and can migrate to upper floors through stairways, HVAC systems, and structural gaps. While concentrations are typically highest at the lowest level, upper floors in District of Columbia County homes can still have measurable radon. Always test on the lowest livable floor.

How much does radon mitigation cost in District of Columbia?

In District of Columbia, radon mitigation systems typically cost between $800 and $2,500 depending on home size, foundation type, and local labor rates. The most common system (sub-slab depressurization) averages $1,000-$1,500. The fan lasts 10-15 years and costs $150-$300 to replace. Some states offer financial assistance programs for radon mitigation.