Short Term Radon Testing
Radon Test Accuracy
For accurate results, closed house conditions must be met for 12 hours before test placement and for the duration of the test.
If closed house conditions are not met, the radon test may be considered invalid.
A long term radon test provides a more accurate average reading and closed house conditions are not required.
Closed House Conditions
Normal entry and exit is OK. Normal use of fresh air or make-up air intake is OK. Do not leave exterior vents open.
When to Test for Radon
Periodic radon testing is advised in Zone 1, in areas where the radon level is close to or above 4.0, and in homes with active radon reduction systems.
Radon levels can always be reduced with radon mitigation systems.
Fairfax County, Manassas, and Falls Church are in Zone 1.
Also recommended in North Arlington and Rock Creek area.