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Radon testing

Radon Testing in Charles County, 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 all of Charles County

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What our customers say

From our customer reviews.

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

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

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

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

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

Elizabeth Anne NewberryCustomer review
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Where we test in Charles County

Three communities in the county have pages of their own with local detail. The test, the price and the technicians are the same everywhere in the county, so you can also book straight from here.

  • La Plata

    Charles County identifies La Plata as the County seat and one of its three incorporated towns.

  • St. Charles

    Charles County says large-scale modern residential development began with construction of the St. Charles planned community in 1970.

  • Waldorf

    Charles County says Waldorf developed around an 1872 Baltimore and Potomac Railroad station in a farming community.

How much does radon testing cost in Charles County?

A radon test in Charles 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. One residence is included in the standard amount. A second dwelling, several leased units or multiple addresses require a confirmed scope.

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.

National Radon Safety Board

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 Charles County.

What the ground does under Charles County homes

Charles County falls in EPA Zone 2, a moderate predicted-potential band. The category covers La Plata, St. Charles, Waldorf and other county addresses without providing a home value. Use data collected inside the residence for the decision.

La Plata, St. Charles and Waldorf are the linked Charles County communities. Choose the place matching the full address and identify the residence that needs a result. A second dwelling, rental unit or additional address should be listed separately so the scope can be confirmed.

Local background: EPA Map of Radon Zones raw county data, EPA Map of Radon Zones guidance, Waldorf local source, La Plata local source.

A historic brick farmhouse with a covered front porch, dormer windows and an attached older wing, shaded by a large tree on an open lawn

01

Use Zone 2 to frame, not answer, the question

Charles County's moderate-potential category is a coarse planning estimate. A La Plata, St. Charles or Waldorf report must be based on data gathered inside the identified dwelling.

02

List separate dwellings before the visit

A main house, accessory dwelling and rental unit are separate scope items unless the technician confirms a combined plan.

03

Attach the result to one measured address

The written report records the device location and dates for the selected Charles County residence, not neighboring or unmonitored structures.

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 Charles County

Radon testing in Charles County, answered straight

How should a Charles County homeowner interpret Zone 2?

It is a countywide forecast category rather than a test outcome. The reading collected at the Charles property is what informs the owner, buyer or tenant.

Which Charles County local page should I open?

Choose La Plata, St. Charles or Waldorf according to the complete property address. If the residence falls elsewhere in Charles County, use the county page and provide its address when booking. The place choice helps route the request while the indoor monitor supplies the result.

Where is a monitor considered in a Charles County residence?

Identify the lowest level suitable for regular use, whether it is finished now or could be occupied later. If another dwelling exists on the parcel, do not treat its rooms as part of the first residence.

What should a Charles County multi-property work order include?

List each street address, dwelling or unit, access contact and reporting deadline. Note whether monitor placement and pickup must occur in a particular sequence. That inventory lets the team plan equipment and travel, then confirm a price for work beyond the standard one-residence service.

Book a radon test in Charles County

Book online or call (703) 450-6398.

Schedule a radon test Request a price

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46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398

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