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Radon testing
A continuous monitor on the lowest level that could be used regularly, read every hour for at least 48 hours. The written result comes the day we collect it.
4.9 rating, over 4,000 reviews NRSB-certified technicians Serving Fairfax County
A radon test in Fairfax is $185, or $175 when it is added to a home inspection. That is the whole price: both visits, the monitor for the full 48 hours, and the written report with every hourly reading in it. The residential price covers one Fairfax home or unit. Book online or call with the exact address, unit and access contact when the property is attached, rented or managed.
Day 1
Drop-off
A technician places it on the lowest level that could be used regularly, following EPA placement limits and the intended use of the space, inside a two-hour arrival window. With a home inspection, placement happens during the inspection visit.
48 hours
The house stays closed
For a short-term real-estate test, EPA guidance calls for closed-building conditions for at least 12 hours before the test and throughout the measurement. Windows stay closed, exterior doors open only for normal entry and exit, and the monitor logs hourly readings that help document the test conditions during the minimum 48-hour measurement.
Day 3
Pick-up and report
A technician picks the monitor up in another two-hour window and pulls the full record on the spot. The written report reaches you the same day.
NRSB-certified technicians. Our own team, certified by the National Radon Safety Board, not a subcontractor.
EPA testing guidance. Placement, closed-house conditions and the 48-hour minimum follow it, and your average is read against the EPA action level of 4.0 pCi/L.
Continuous monitors. Airthings Corentium Pro instruments, logging every hour for the whole test.
Appointment times are requests until our team confirms them. What the number means, how to prepare the property and the eight questions everyone asks are on the radon testing page; this page is about Fairfax.
The independent City of Fairfax is evaluated separately from Fairfax County, so a numerical county radon zone should not be assigned to a City address. Virginia health guidance advises testing all homes. The useful result comes from a measurement inside the selected Fairfax residence.
A City work-session document records that Enclave Condominiums were constructed in 2017. That fact applies to the named development, not the City’s full housing stock. At a condominium, confirm the exact unit, lobby procedure and authorized access before booking. If a lower room may later serve as living or work space, include it when discussing placement.
Local background: Fairfax primary housing context, Virginia Department of Health radon guidance, EPA Map of Radon Zones.
01
A City work-session document records that Enclave Condominiums were constructed in 2017. That fact applies to the named development, not the City’s full housing stock.
02
Show every low Fairfax room that may support daily activity, including space intended for a later bedroom, office or family room.
03
Once equipment is deployed in Fairfax, maintain the instructed conditions and give the technician an honest timeline of anything unusual.
Where we test in Fairfax, and what to tell us
Fairfax City centre
At a condominium, confirm the exact unit, lobby procedure and authorized access before booking.
Kings Park and nearby streets
If a lower room may later serve as living or work space, include it when discussing placement.
Fairfax Station, Fair Oaks, Oakton
For an address in Fairfax Station, Fair Oaks, Oakton, use the current floor plan and keep the selected area available for placement and retrieval.
We do not install radon systems, so we have nothing to gain from your number. If the result is at or above the EPA action level of 4.0 pCi/L, you choose who fixes it. Once the system is in, we can test again and tell you what it reads.
Virginia's residential disclosure statute directs the seller's disclosure statement to say that the owner makes no representation about whether the property is in an EPA Zone 1 or Zone 2 locality. It directs buyers to use due diligence, including reviewing EPA, Virginia Department of Health and NRSB information and ordering a radon inspection before settlement as the contract allows.
Va. Code section 55.1-703. Current as of September 2026. General information, not legal advice.
No. The Enclave construction date does not establish radon conditions in a unit. EPA recommends testing homes regardless of age because an address-specific measurement is what supports a decision.
Provide the complete unit number and arrange lobby, elevator and unit entry for placement and pickup. If management approval is required, secure it before the technician arrives.
No. A residential test measures the selected condominium unit. It should not be presented as the result for other units, shared spaces or the entire Enclave building.
Mention any low room that may become a bedroom, office, gym, playroom or other regularly occupied space. Planned regular use can affect the level the technician selects.
Book online or call (703) 450-6398.
Schedule a radon test Request a price
NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398
