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Home/Radon Testing/Loudoun County/South Riding, VA

Radon testing

Radon Testing in South Riding, 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 Loudoun 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.

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

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

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

Elizabeth Anne NewberryCustomer review
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How much does radon testing cost in South Riding?

A radon test in South Riding 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 South Riding residence is included in the quoted appointment. Another condominium unit, accessory apartment or community facility requires separate permission and a distinct service scope.

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.

National Radon Safety Board

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 South Riding.

Radon testing for South Riding homes

South Riding is in Loudoun County, where Virginia health officials say later test results support a higher radon-risk designation than the older map shows. A county assessment is a reason to check your home, not a prediction of its reading. Townhouses, condos and recently built houses can each have different indoor levels. Test the exact residence, and tell the technician about the lowest room that could be used regularly.

Before a South Riding appointment, provide the complete house or unit address and an authorized contact for both visits. The monitor stays in place for at least 48 hours. Choose dates when residents can follow closed-house instructions and moving, cleaning or repairs will not disturb the device. If a condo building uses controlled entry, arrange it for placement and collection. A buyer should also allow time for the written report before a contract deadline.

Radon testing guidance: Loudoun County Health Department radon guidance, Virginia radon risk-map guidance, EPA radon guidance for buyers and sellers.

Aerial view of a suburban neighborhood bordered by trees

01

Newer homes still need testing

Construction age and a Loudoun map label cannot establish one home's indoor radon level.

02

Townhouse or condo scope

Identify the precise residence and any lower room planned for regular use.

03

Make both visits possible

Coordinate occupants and building access for setup and pickup.

Where we test in South Riding, and what to tell us

  • Tall Cedar Estates

    For a house, describe a lower office, bedroom or family room that could be used regularly.

  • The Parks and Amberlea

    For an attached home, specify the booked unit and its entry contact.

  • Town Center and Edgewater

    For a condo, provide building instructions that work on both visits.

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 South Riding

Radon testing in South Riding, answered straight

Does a recently built South Riding home need a radon test?

Yes. A newer home's construction does not tell you its indoor radon level. Testing the finished residence is the way to obtain a result for that property.

Can a South Riding condo use another unit's radon result?

No. A test should measure the condo being bought or occupied. Give the building and unit number so the technician can arrange access to that residence rather than a common area or neighboring unit.

What should residents do during the test?

Follow the technician's closed-house instructions and leave the monitor where it was placed for at least 48 hours. Schedule moving, cleaning and repair activity so the test area stays undisturbed.

What if a South Riding seller has a tight deadline?

Tell the team the contract deadline before booking. The schedule must still allow for placement, the minimum measurement period, collection and delivery of the report.

Book a radon test in South Riding

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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