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Home/Radon Testing/Fairfax County/Annandale, VA
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 Annandale 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. A normal booking covers one Annandale residence. Multifamily common space, a separately leased lower unit or another dwelling should be identified for separate authorization and pricing.
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 Annandale.
Annandale is in Fairfax County, which the EPA lists as radon Zone 1. The county classification describes potential across a broad area; it cannot tell an Annandale buyer or owner what one house measures. Test the individual residence and identify its lowest level that could be used regularly, including a planned lower bedroom, office or family room.
Fairfax County's Annandale plan describes detached homes alongside townhouses, condominiums and garden apartments. Those housing forms call for different access arrangements, not different assumptions about radon. Give the full address and unit, explain whether the lower area belongs to the booked dwelling, and arrange permission from an owner or tenant before both technician visits.
Local background: Fairfax County Annandale plan overview, amended through July 31, 2018, Virginia Department of Health indoor radon map, EPA Map of Radon Zones guidance.
01
Describe any lower room intended for living or work after the sale. Present furniture alone does not determine the testing level.
02
Choose a stable test window, keep the selected room accessible and leave the monitor undisturbed until collection.
03
For a rental or separate living area, confirm the exact unit and who can authorize entry for placement and pickup.
Where we test in Annandale, and what to tell us
Ravenwood Park, Annandale Acres
For Ravenwood Park or Annandale Acres, tell the technician about a lower recreation room, bedroom or planned regular-use space.
Broyhill Crest, Canterbury Woods
In Broyhill Crest or Canterbury Woods, clear the chosen space and coordinate both visits with everyone who controls access.
Sleepy Hollow Woods
Near Sleepy Hollow Woods, identify whether the order covers one home or a separate apartment and obtain occupant permission in advance.
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.
It makes the exact residence and access boundary important. State whether the test is for a whole detached home, one townhouse, one condominium or one apartment, and identify any separately controlled lower space.
Describe every level that could be used regularly, including partially below-grade rooms, and explain their current and expected uses. The technician will choose placement after seeing the actual configuration.
Keep pets from contacting the monitor and from forcing exterior doors to remain open contrary to the instructions. Tell the team beforehand if the chosen area cannot be isolated safely.
Note the time, duration and nature of the event, such as cleaning near the device or a prolonged open door. Send that information to the technician without moving the equipment.
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
