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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 Frederick County
A radon test in Frederick 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. Residential pricing covers one Frederick home or unit. State whether a row house, apartment or divided property contains separate dwellings. If a property has an English basement apartment or rear unit, state which dwelling needs the report and who can authorize 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 Frederick.
Frederick County, Maryland, is EPA Zone 1. This page concerns Frederick, Maryland, not Frederick County, Virginia; the residence still needs its own reading.
City historic-district guidelines identify detached houses, twin dwellings, row houses and multifamily buildings within the Frederick Historic District. That documented district mix supports several access scenarios without classifying later City neighborhoods. Market Street mixed-use buildings may require separate residential access, while row houses and twin dwellings need clear address identification despite attached walls. Around Carroll Creek or Baker Park, plan around public events and visitor traffic. In a later subdivision, prepare the actual low-use level rather than relying on construction age. Each result remains tied to one dwelling. Record any unavoidable entry or ventilation interruption for the technician.
Local background: Frederick primary housing context, Maryland Department of Health radon guidance, EPA Map of Radon Zones.
01
Detached, twin, row and multifamily buildings require different access plans but all need unit-specific results.
02
Do not confuse Frederick, Maryland, with Virginia’s Frederick County or Stephens City.
03
A party wall does not extend one home’s measurement into the adjoining residence.
Where we test in Frederick, and what to tell us
Market and Patrick Street area
Near Market and Patrick Streets, identify the residence within any mixed-use building and coordinate business-hour entry.
Carroll Creek and Baker Park residential edges
At Carroll Creek or Baker Park edges, select dates without events, visitors or contractor traffic near the monitor.
Later Frederick residential neighborhoods
In later neighborhoods, building age does not settle radon risk; prepare the actual lowest regularly usable room.
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.
No. Each dwelling needs its own measurement despite the shared wall.
Provide the unit, residential entrance and authorized keyholder for both visits.
No. Age alone does not establish indoor radon concentration.
This record is for Frederick, Maryland, in Frederick County, Maryland.
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
