Skip to content
Home/Radon Testing/Montgomery County/Bethesda, MD
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 Montgomery County
A radon test in Bethesda 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 residential test covers one Bethesda dwelling. Call when a condominium desk, tenant or separate unit affects access. If a sale involves an estate, relocation company or tenant, identify the person authorized to approve entry.
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 Bethesda.
A Bethesda rebuild, older house and condo each need their own indoor measurement; construction age and neighborhood averages cannot tell you the result. Maryland health officials recommend testing homes for radon. Describe the lowest room that is or could be used regularly, including a basement office, bedroom or finished area planned after purchase. For a condo, identify the exact unit and ask about access rather than relying on a result from another unit.
For a Bethesda radon appointment, provide the full address, unit number when applicable, and an authorized contact for both monitor placement and collection. The test lasts at least 48 hours, with occupants following closed-house instructions and leaving the device undisturbed. If a newly built home is still under construction, schedule after the living space is ready for normal conditions. Tell us about separately occupied lower units or contract deadlines before booking.
Radon testing guidance: Maryland Department of Health radon guidance, EPA guidance on newly built homes, EPA guide for home buyers and sellers.
01
A rebuilt Bethesda home should be tested when ready for occupancy.
02
A common-area or neighboring reading does not measure your residence.
03
A planned basement bedroom or office can affect test placement.
Where we test in Bethesda, and what to tell us
Edgemoor and Bradley Hills
For a house or rebuild, describe the finished lower living area.
Glen Echo Heights and Maplewood-Alta Vista
Share current occupancy and access details for both visits.
Wildwood area
For a condo or attached home, identify the exact booked unit.
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.
Maryland's residential disclosure framework includes radon among the hazardous or regulated materials covered by an owner's actual knowledge for certain single-family residential property of four or fewer units. The statute has enumerated exemptions and does not itself require a radon test. County and municipal requirements may differ, so check the rules for the property's location and type before relying on an existing result.
Md. Real Property section 10-702. Current as of September 2026. General information, not legal advice.
Yes. New construction and radon-resistant features do not provide a measurement of the completed home. Arrange testing when normal living conditions can be maintained.
No. The relevant result is from the specific condo. Give the building and unit number and arrange private-unit access for both visits.
Tell the technician about the planned regular use, even if the room is not occupied yet. The lower level may matter when selecting the test location.
Share the contract date before booking. Leave time for placement, at least 48 hours of measurement, collection and the written report.
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
