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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 Howard County
A radon test in Columbia 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 service covers one Columbia house, townhouse, condominium or apartment. Call if management coordinates 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 Columbia.
A Columbia village name or Howard County map does not tell you the radon level inside one residence. Test the house, townhouse or condo you own or plan to buy. Describe the lowest room that is or could be used regularly, including a basement family room or home office. For a condo, identify the private unit; a result from another apartment or common space cannot answer for it.
For a Columbia radon test, provide the complete address, unit number when applicable and an authorized contact for both visits. The technician places a monitor for at least 48 hours and returns to collect it. Residents should follow closed-house instructions and leave it undisturbed. If a building has desk, elevator or key access, arrange the same route for pickup. Buyers should allow time for the report before a contract deadline.
Radon testing guidance: Maryland Department of Health radon guidance, EPA radon-zone map guidance, EPA guide for home buyers and sellers.
01
A Howard County map is no substitute for a Columbia home's measurement.
02
Describe a basement office, bedroom or planned family room.
03
Confirm building and private-unit entry for two visits.
Where we test in Columbia, and what to tell us
Wilde Lake and Harper's Choice
For a house or townhouse, explain lower-room use.
Oakland Mills, Owen Brown and Long Reach
For an occupied home, coordinate instructions with residents.
Town Center and other villages
For a condo, provide unit and building-entry details.
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. An area map and another home's reading cannot measure the air inside your residence. Test the specific property.
A result from a common area or another unit cannot establish the level in the private condo. Provide the exact building and unit when booking.
Tell the technician about the lowest room used or suitable for regular use, including a space a buyer plans to occupy later.
Provide desk, elevator, parking and unit-entry instructions that will work for both placement and collection after at least 48 hours.
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
