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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 Washington, DC
A radon test in Washington 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 one District house or individual residence; ask us to confirm scope and pricing when a property has several units or needs building-wide work.
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 Washington.
The DC Department of Energy & Environment recommends testing because a map of earlier results cannot establish the radon level in your own Washington residence. A rowhouse, detached home and condo may each need a different access plan, but the question is the same: what is measured inside the specific dwelling? Tell the technician about the lowest room that is or could be used regularly, including a basement bedroom, office or family area planned after purchase.
For a professional Washington, DC radon appointment, provide the complete address and unit number, plus a contact for monitor placement and collection. The measurement lasts at least 48 hours; occupants should follow closed-house instructions and leave the device alone. Mention a separately occupied basement apartment, restricted condo entry or a contract deadline when booking. DC residents can also request a free do-it-yourself radon test kit from DOEE if that option suits their needs.
Radon testing guidance: DC Department of Energy & Environment radon guidance, EPA guide for home buyers and sellers.
01
A DC surveillance map is no substitute for a result inside your residence.
02
A basement apartment may require its own testing scope.
03
A house or condo must be available for placement and pickup.
Where we test in Washington, and what to tell us
Capitol Hill, Shaw and Georgetown
For a rowhouse, explain any lower living area or separate basement unit.
Columbia Heights and Petworth
Give the exact unit and entry contact in a divided or shared-entry building.
Brookland
For a detached home, describe lower rooms planned for regular use.
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.
The District Department of Energy and Environment recommends testing every home. Its radon program offers free test kits to District residents, publishes a map of results submitted by District Radon Test Kit users, and points residents to certified measurement professionals. A result for the property is more useful than an area label when making a decision about that home.
DOEE Radon in the District. Current as of September 2026. General information, not legal advice.
No. DOEE's map shows results from other tested homes. Testing the residence you occupy or plan to buy is how to learn its indoor level.
Tell us if the basement is a separately occupied dwelling. The appointment covers the booked residence; a separate unit's scope and access should be confirmed before scheduling.
Arrange entry on both visits, follow the technician's closed-house instructions and keep the monitor undisturbed for at least 48 hours.
Yes. DOEE offers free radon test kits to District residents. A professional appointment is another option when you need coordinated placement, collection and a report for a transaction.
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
