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Radon testing

Radon Testing in Montclair, 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 Prince William 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 Montclair?

A radon test in Montclair 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. One Montclair dwelling is included; call about gates, tenants or a second unit. If a gate code expires, arrange a staffed meeting point so collection does not depend on the original temporary credential.

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 Montclair.

Radon testing for Montclair homes

Montclair is in Prince William County, which the EPA places in radon Zone 2. The zone is a regional estimate; it cannot determine the radon level in a particular Montclair house or townhouse. Test the home itself to get a usable result. Tell the technician which lower rooms are occupied now or could become a bedroom, office or family space after a move.

A Montclair radon test requires access for monitor placement and again after at least 48 hours for collection. Provide the exact street address, an entry contact, and any gate, alarm or pet instructions. Keep the selected room available and follow closed-house instructions throughout the test. A location near Lake Montclair does not change how the indoor measurement is performed or what the result means.

Radon testing guidance: EPA radon and real-estate guidance, Virginia Department of Health radon guidance, EPA Map of Radon Zones.

A wooden Welcome to Montclair sign among trees

Test the house

Neither a Zone 2 label nor a waterfront location predicts your indoor result.

Select useful space

Describe a lower walkout, office or bedroom that people may use regularly.

Plan pickup

Keep the monitor undisturbed and arrange a contact for both technician visits.

Where we test in Montclair, and what to tell us

Lake Montclair, Dolphin Beach
Around Lake Montclair, focus on the house's own lower living space rather than the lake.
Country Club, Southlake
For Southlake or Country Club addresses, share any visitor and keyholder instructions.
Four Seasons
For Four Seasons, identify the precise residence and keep its monitor in place until collection.

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 Montclair

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Radon testing in Montclair, answered straight

Does living near Lake Montclair predict radon?

No. Test the individual residence.

What gate details are useful?

Provide authorization, entry code or meeting contact for placement and retrieval.

Can Four Seasons use a community-wide result?

No. Each tested dwelling has its own result.

Which room should I prepare?

Prepare the lowest room that could be used regularly.

Book a radon test in Montclair

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

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