DMV Homeownership
Do I Need a Radon Test in Maryland, DC, or Northern Virginia?
A practical DMV homeowner guide to radon testing, including Montgomery County sale requirements, when to test, what results mean, and what records to keep.
Direct answer
Do you need a radon test in the DMV?
Radon testing is worth considering throughout the DMV, and Montgomery County has a specific legal requirement for many single-family home sales. The County requires covered homes to be tested within one year before settlement, with limited exceptions. Outside that rule, testing is still a practical way to understand a condition that cannot be seen or smelled. Potomac Lux can keep the test, mitigation work, and follow-up results in the Home Record so the information stays with the property.
Montgomery County has a specific sale requirement
Montgomery County requires a radon test before settlement for many single-family home sales, including detached homes and townhomes, with specific exemptions. The test generally must be performed within one year before settlement and both buyer and seller receive the results.
The requirement does not apply uniformly across every DMV jurisdiction, so verify the rule for the exact property rather than assuming the whole region follows the same process.
A test is useful even when no sale is happening
Radon is invisible and odorless, so a homeowner cannot judge the level by how a basement looks or smells. Testing provides evidence instead of guesswork, particularly when lower levels are used as living or working space.
If a result is elevated, use current EPA and local guidance to decide whether confirmation or mitigation is appropriate.
If mitigation happens, preserve more than the invoice
Keep the original test, mitigation proposal, installer information, system details, post-mitigation test, and any recommended retest schedule.
Potomac Lux can connect those records to the home itself so a future question starts with the actual history rather than a vague memory that “something was done about radon.”
Official references
Sources and homeowner references
Related guidance
Keep the result with the home
A radon test should become part of the home’s permanent context.
Potomac Lux can keep the test result, mitigation work, retest, contractor information, and follow-up history attached to the Home Record so the next owner or household member does not have to rediscover it.
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