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Home/Radon Testing/Frederick County, 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 all of Frederick County
Schedule a radon test Call (703) 450-6398 Find your community
Five communities across the county have a page of their own with local detail. The test, the price and the technicians are the same in every one of them, so you can also book straight from here.
Frederick Historic District guidelines say residential buildings there include detached single-family homes, twin dwellings, row houses, and multifamily structures.
Frederick County says Ballenger Creek is mostly residential, primarily single-family detached or attached homes with some multifamily buildings.
Frederick County identifies Urbana as a Community Growth Area along the I-270 corridor in the Primary Growth Sector.
Brunswick says its National Register Historic District is a turn-of-the-century railroad town with working-class houses that vary by lot size, setback, and house size.
Mount Airy says it has remained divided between Carroll and Frederick Counties since county boundaries were set in 1837.
Frederick County, Maryland and Frederick County, Virginia are different jurisdictions. Mount Airy also extends across the Carroll County line, so use the full address and state.
A radon test in Frederick County 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 listed price covers one Maryland residence. Cross-county orders, several houses or multiple apartments need a confirmed scope.
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 Frederick County.
Maryland's Frederick County is in EPA Zone 1. The county name, Mount Airy's boundary and the separate Virginia jurisdiction make address accuracy important, but none predicts indoor concentration. Testing supplies the result for the named Maryland residence.
The county hub links Frederick, Ballenger Creek, Urbana, Brunswick and Mount Airy. Maryland and the complete address matter because Virginia has a separate Frederick County and Mount Airy sits on the Carroll County line. Identify the residence and any additional unit before the scope is confirmed.
Local background: EPA Map of Radon Zones raw county data, EPA Map of Radon Zones guidance, Frederick local source, Ballenger Creek local source, Urbana local source, Brunswick local source, Mount Airy local source.
01
EPA classifies Maryland's Frederick County in Zone 1. The same county name in Virginia and Mount Airy's boundary context make the full address essential, but neither geography supplies an indoor reading.
02
State and county labeling prevents confusion with Frederick County, Virginia, and helps the final report remain attached to the correct property.
03
The seller, tenant or manager should begin closed conditions on time and know that the monitor must remain undisturbed through collection.
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.
It is EPA's highest county-potential band for this Maryland jurisdiction. The label supports a decision to measure; only the property test supplies a value for the residence.
The hub links Frederick, Ballenger Creek, Urbana, Brunswick and Mount Airy. Mount Airy requires attention to the county line, and the state distinguishes this page from Frederick County, Virginia. Use the complete property address when choosing a local destination.
Show the technician the lowest level that could be used regularly, including an unfinished space intended for later occupancy. The selected room should represent the Maryland residence named on the request.
Virginia has a separate Frederick County, and Mount Airy sits on the Carroll County line. Including Maryland and the full address prevents the request and report from being routed to the wrong jurisdiction. Property-specific testing then proceeds from the actual dwelling rather than the shared county name.
Book online or call (703) 450-6398.
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NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398
