Home/Radon Testing/Fairfax County, VA
Radon testing
Radon Testing in Fairfax County, VA
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 Fairfax County
Schedule a radon test Call (703) 450-6398 Find your community
What our customers say
From our customer reviews.
They conducted the test right away and kept me informed every step of the way.
Rachel RaphaelRadon testing
View on Google They arrived the day after I called, on time, set up the Radon test and left within 5 minutes.
Catherine HRadon testing
View on Google Everything was handled so professionally, quickly and so easy to have our house tested for radon.
Alma PrinceRadon testing
View on Google They found elevated radon in the home and numerous issues on the home inspection report which were remedied before I moved in.
Shawn McCallRadon testing
View on Google Great service, very thorough inspection and highlighted items in a very approachable and organized manner.
Elizabeth Anne NewberryCustomer review
View on Google Where we test in Fairfax County
Seventeen communities across the county have a page of their own with local detail. The test, the price and the technicians are the same in every one of them, so you can also book straight from here.
Inside and near the Beltway
- Annandale
A 2013 Fairfax County plan described detached housing, garden-style apartments and condominiums, and scattered townhouses in the Annandale Planning District.
- Falls Church
The City of Falls Church is an independent jurisdiction adjacent to Fairfax County, not a community within the County.
- McLean
County planning identifies detached homes as the predominant form outside the McLean Community Business Center in the Kirby sector and separately names townhouse developments there.
- Tysons
Fairfax County describes Tysons as an urban center planned around four Metro stations and documents both an existing townhouse community and an existing high-rise apartment building.
- Vienna
The Town of Vienna's 2026 community profile reports detached, attached and multifamily housing within the incorporated Town; that profile does not cover every Vienna mailing address.
North county and the Dulles corridor
- Reston
Fairfax County planning material describes detached homes, townhouses, garden apartments, mid-rise buildings and high-rises in Reston.
- Herndon
Town planning identifies Downtown Herndon as the historic core and notes completed small-lot residential and mixed-use infill; Herndon postal addresses also extend into unincorporated Fairfax County.
- Great Falls
A Fairfax County parcel record identifies a detached-home example in the Great Falls West subdivision; it is an example rather than a profile of all Great Falls housing.
- Oakton
A County staff presentation maps existing single-family and townhouse areas and multifamily residential areas near the AT&T Oakton site.
- Chantilly
County planning material for the Fairfax County portion of the Stringfellow area identifies Greenbriar and Brookfield as communities with detached houses and townhouses.
Central county
- Fairfax
The independent City of Fairfax identifies Old Town, Northfax, Kamp Washington, Fairfax Circle, and Pickett and Main as its five activity centers.
- Fair Oaks
A 1986 County plan identified Fair Oaks as a regional shopping center and separately noted nearby townhouse and garden-apartment development.
- Centreville
The County's Centreville study describes a broad mix of residential, commercial, mixed-use and institutional land, with detached homes, townhomes and multifamily housing among the residential forms.
South county
- Burke
Fairfax County planning material describes Burke Centre as a planned community with detached, townhouse and multifamily units.
- Springfield
County planning describes primarily detached housing in the Crestwood sector outside the Springfield Community Business Center, some townhouses along its northern edge, and named townhouse communities in West Springfield.
- Fairfax Station
The County's Pohick Planning District overview distinguishes detached-house and townhouse development east of Ox Road from a lower-density residential pattern farther west.
- Lorton
Fairfax County's Laurel Hill planning pages distinguish adapted historic campus buildings from new infill, while adopted planning text identifies Lorton Station as a residential subdivision.
Fairfax County, the City of Fairfax and the City of Falls Church are distinct jurisdictions. Fairfax County surrounds the City of Fairfax and is adjacent to the City of Falls Church. Provide the full property address so the request and report identify the property correctly.
How much does radon testing cost in Fairfax County?
A radon test in Fairfax 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 home-test price applies to an individual residence. Confirm scope and pricing when a request concerns more than one unit or building.
Day 1
Drop-off
We place the monitor
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
The monitor does the work
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
We collect it, read it, and write it up
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 County.
What the ground does under Fairfax County homes
Fairfax County is EPA Zone 1, a county-level potential category. Fairfax County Health says its local potential map is a general guide and that homes above and below 4.0 pCi/L can occur on the same street. A measurement inside the individual property provides the result for that property.
Access arrangements can differ by residence or building. When requesting a test, identify the residence or unit, the lowest level that could be used regularly and anyone who must provide entry. The technician confirms the measurement location for the requested scope.
Local background: Fairfax County Health radon guidance, Fairfax County FY 2022 Sustainability Report, Fairfax County compiled Reston plan, March 2022, Fairfax County historic Annandale plan, amended 2013, Fairfax County Pohick plan, amended 2021.
01
County maps provide background, not a home result
Fairfax County Health calls its radon potential map a general guide. Use the measurement from the individual property when making a decision about that property.
02
The lowest regularly usable level shapes the discussion
Tell us how the lowest level could be used, even if it is unfinished today. The technician confirms a measurement location that fits the requested scope.
03
Entry can involve more than the resident
If a tenant, manager or other contact controls access, identify that person when arranging the test so placement and collection can be coordinated.
We only perform testing, not mitigation.
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.
Before you book in Virginia
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.
Radon testing near Fairfax County
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Radon testing in Fairfax County, answered straight
Do you test for radon everywhere in Fairfax County?
Yes. We serve Fairfax County for residential radon testing. Provide the full property address and say whether the request concerns one residence, multiple units or more than one building. Book online or call so we can confirm the scope for that property.
Fairfax County is Zone 1. Does that mean my house is high?
No. Zone 1 is a county-level potential category. Fairfax County Health says homes above and below 4.0 pCi/L can occur on the same street, so use the property measurement for the decision.
My address says Fairfax, but the house is in the City of Fairfax or Falls Church. Does that change anything?
Use the full property address. Fairfax County, the City of Fairfax and the City of Falls Church are distinct jurisdictions, so the address should identify the property correctly before the test is arranged.
What property details should I provide for a Fairfax County appointment?
Identify the residence or unit, the lowest level that could be used regularly and any person needed for entry. The technician confirms the measurement location and scope.
Book a radon test in Fairfax County
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