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Home/Radon Testing/Frederick County, 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 all of Frederick County
Schedule a radon test Call (703) 450-6398 Find your community
Two communities in the county have pages of their own with local detail. The test, the price and the technicians are the same everywhere in the county, so you can also book straight from here.
Stephens City is an incorporated town in Frederick County.
Winchester says its Historic Winchester District comprises nearly 1,000 contributing properties.
Winchester is an independent city surrounded by Frederick County. Frederick County, Virginia is also a different jurisdiction from Frederick County, Maryland, so the full address and state matter.
A radon test in Frederick County 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 standard amount applies to one Virginia residence. Multiple jurisdictions, dwellings or units require a confirmed scope and price.
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 Frederick County.
EPA assigns Frederick County, Virginia, to Zone 1. Independent Winchester lies outside the County's jurisdiction, and Maryland has a different county with the same name. Confirm the property address, then use an indoor measurement to establish the residence's radon level.
Stephens City is the linked county community, while Winchester is an independent city with a separate page. Maryland also has a different Frederick County. Confirm the state and jurisdiction, then identify the residence and its lowest level that could be used regularly.
Local background: EPA Map of Radon Zones raw county data, EPA Map of Radon Zones guidance, Stephens City local source, Winchester local source.
01
Frederick County, Virginia, has an EPA Zone 1 listing. Keep that County classification separate from independent Winchester and from Frederick County, Maryland; the result measured at the booked Virginia residence is the property evidence.
02
Frederick County, Virginia, independent Winchester City and Frederick County, Maryland, are separate destinations. Put the full jurisdiction on the request.
03
An unfinished space can matter when it could be occupied later. The technician reviews the actual layout before selecting the monitor position.
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.
EPA places this Virginia county in its higher-potential band. That category neither covers independent Winchester City nor predicts a selected Frederick County home's result.
No. Winchester is an independent Virginia city with a separate local page. Stephens City is within Frederick County. Confirm the address and jurisdiction before choosing the appropriate page and arranging the measurement.
Identify the lowest part of the county residence that could be used regularly, including potential future occupancy. Once the Virginia jurisdiction is verified, the technician confirms the appropriate room for the monitor.
Close windows and exterior doors 12 hours before monitor placement and maintain those conditions during the 48-hour measurement. Normal entry and exit are allowed, but the device should remain undisturbed.
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
