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Home/Radon Testing/Baltimore County/Catonsville, 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 Baltimore County
A radon test in Catonsville 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 residential rate applies to one Catonsville home or unit. Book online or call with the full address, access contact and separate-unit details when applicable.
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 Catonsville.
A Catonsville address does not predict a home's radon result. Maryland's map summarizes measurements from other properties; testing the actual Baltimore County residence is how an owner or buyer gets useful evidence. Tell the technician how the lowest level is used now and how a buyer might use it later. A finished basement bedroom, work area or family room can change the appropriate test location, regardless of the home's age or style.
Before a Catonsville radon appointment, provide the full address, an entry contact for both visits and any lockbox, tenant or pet instructions. The monitor remains in place for at least 48 hours. Ask occupants to follow the technician's closed-house instructions and avoid work that could disturb the selected room. If a Frederick Road property has more than one dwelling, identify the unit that needs a report before booking.
Radon testing guidance: Maryland Department of Health radon guidance, EPA radon-zone map guidance, EPA guide for home buyers and sellers.
01
The Baltimore County map and nearby tests do not measure one Catonsville home.
02
Point out rooms that are or could be occupied regularly.
03
Arrange an authorized contact for placement and collection.
Where we test in Catonsville, and what to tell us
Frederick Road area
For a divided building, specify the dwelling and entry route.
Winters Lane
Describe any lower room a buyer plans to use after the sale.
Catonsville subdivisions
Schedule around moving or repair work near the monitor.
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. Age and architectural character cannot establish indoor radon level. A measurement in the present-day residence gives the relevant result.
Share the earlier report and the new use with the technician. EPA says a buyer may want a new test when a lower level will be used differently from the level previously tested.
Arrange an authorized entry contact for both visits and tell occupants about closed-house instructions and the undisturbed monitor.
A standard home appointment covers one residence. Identify each separate apartment needing a result so the scope and access can be confirmed.
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
