Home/Radon Testing/Fairfax County/Great Falls, VA

Radon testing

Radon Testing in Great Falls, 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 Fairfax County

Schedule a radon test Call (703) 450-6398

What our customers say

From our customer reviews.

They conducted the test right away and kept me informed every step of the way.

They arrived the day after I called, on time, set up the Radon test and left within 5 minutes.

Everything was handled so professionally, quickly and so easy to have our house tested for radon.

They found elevated radon in the home and numerous issues on the home inspection report which were remedied before I moved in.

Great service, very thorough inspection and highlighted items in a very approachable and organized manner.

How much does radon testing cost in Great Falls?

A radon test in Great Falls 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 Great Falls service is scoped to one residence. A guesthouse, caretaker unit or separately occupied apartment should be listed before booking so each requested dwelling can be priced.

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 Great Falls.

Great Falls radon testing in Fairfax County's Zone 1

Great Falls is in Fairfax County, an EPA radon Zone 1 jurisdiction. The county map describes potential across many properties; it cannot predict a Great Falls home's reading. Test the individual residence and discuss its lowest room that could be used regularly, including a walkout, office, bedroom or recreation space planned for future use.

Fairfax County planning describes the Springvale sector near Great Falls Village as an area with residential estates and large-lot subdivisions. That is community context, not a claim about a specific home or its radon level. On a property with a long drive, gate or alarm, give instructions for both visits. If there is a guesthouse or accessory dwelling, identify which residence is booked and who authorizes entry; one monitor in the main house does not test another dwelling.

Local background: Fairfax County Springvale community plan, Virginia Department of Health indoor radon map, EPA radon zone map limitations.

Great Falls Village area

Describe the booked residence and its lower usable rooms; the local plan cannot substitute for a test.

Gates and long driveways

Provide a working access plan, property contact and alarm or pet instructions for both visits.

Guesthouse boundaries

List separate dwellings so the testing scope and occupant permissions are clear.

Where we test in Great Falls, and what to tell us

Falcon Ridge, Great Falls Estates
Near Great Falls Village, point out a lower room that could support regular living, work or recreation.
Locust Hill, The Reserve
For a gated or long-drive property, make arrival and collection directions easy to follow.
Hidden Springs
Where a guesthouse or accessory unit is occupied, identify the exact dwelling to be measured.

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 Great Falls

Nearby

Radon testing in Great Falls, answered straight

Can one Great Falls parcel report describe the whole community?

No. The cited county record assigns a land-use code to one Great Falls West parcel only. It cannot establish the building type, lower-level use or radon condition of nearby properties.

How is a Great Falls guesthouse handled in the testing scope?

Identify it as a separate dwelling when requesting service and explain its occupancy and access. The main-residence appointment does not automatically include another habitable structure on the parcel.

What should an owner provide for a gated Great Falls property?

Send gate credentials, alarm steps, driveway directions and two reliable contacts before placement. Confirm that authorization will still work when the monitor is due for collection.

Which deadline details help a Great Falls buyer schedule?

State the contingency cutoff, any restricted access days and the final useful reporting time. The scheduler can assess whether placement, the 48-hour minimum, retrieval and review fit that window.

Book a radon test in Great Falls

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

Property inspections

Specialty inspections

Air & environment

Water & materials

Your next step

Our company