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Radon testing

Radon Testing in St. Charles, MD

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 Charles County

Schedule a radon test Call (703) 450-6398

What our customers say

From our customer reviews.

They conducted the test right away and kept me informed every step of the way.

They arrived the day after I called, on time, set up the Radon test and left within 5 minutes.

Everything was handled so professionally, quickly and so easy to have our house tested for radon.

They found elevated radon in the home and numerous issues on the home inspection report which were remedied before I moved in.

Great service, very thorough inspection and highlighted items in a very approachable and organized manner.

How much does radon testing cost in St. Charles?

A radon test in St. Charles 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 St. Charles home or unit. Book online or call with the exact dwelling and any management, tenant or gate contact needed for access.

Day 1

Drop-off

We place the monitor

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

The monitor does the work

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

We collect it, read it, and write it up

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 St. Charles.

Radon testing for St. Charles homes and private units

Radon testing in St. Charles measures the actual Charles County house, townhouse or private rental unit. A county map or another home in the planned community cannot provide this residence's indoor level. Describe the lowest room used or suitable for regular occupancy, including a basement bedroom or office planned after purchase. If a property has more than one dwelling, identify each unit that needs a written result before scheduling.

Give the full St. Charles street address, any unit number and a person who can admit the technician for both placement and collection. A resident, owner, agent or manager may control entry; arrange both visits before the monitor is deployed. The device stays undisturbed for at least 48 hours while occupants follow closed-house instructions. Avoid cleaning or repairs in the test room and allow time for pickup and the report before a contract deadline.

Radon testing guidance: Maryland Department of Health radon guidance, EPA radon-zone map guidance.

A result for this home

A Charles County map or another address cannot measure the booked St. Charles residence.

Describe lower rooms

Include rooms used regularly or planned for regular use after a purchase.

Protect both visits

Arrange entry for placement and pickup, and keep the monitor undisturbed.

Where we test in St. Charles, and what to tell us

Bannister and Carrington
Describe lower-room use in the booked home and identify the entry contact.
Dorchester, Hampshire and Sheffield
Give the exact dwelling and coordinate both technician visits.
Fairway
Protect closed-house conditions and keep repairs away from the monitor.

We only perform testing, not mitigation.

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.

Before you book in Maryland

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.

Radon testing near St. Charles

Nearby

Radon testing in St. Charles, answered straight

Does a Charles County radon map tell me my St. Charles home's level?

No. The map describes area potential. Only a measurement inside the particular residence provides its indoor result.

Which lower room matters for a St. Charles radon test?

Tell the technician about the lowest room used or suitable for regular occupancy, including a room planned for use after purchase. The technician selects the test position under the testing protocol.

Does one St. Charles home's result cover another?

No. Each residence needs its own measurement if a property-specific result is required.

What if a resident or manager holds the keys?

Arrange authorized access for both monitor placement and collection, and give the testing team the correct contact details.

Book a radon test in St. Charles

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

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