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Home/Radon Testing/Charles County/St. Charles, 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 Charles County
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
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 St. Charles.
EPA places Charles County in Zone 2. The category forecasts county-wide average potential and does not predict an indoor level for a St. Charles residence. EPA recommends testing in every zone because elevated results can occur anywhere. Use a property-specific measurement, and describe the lowest level that could support regular activity so the technician can select an appropriate location without guessing from the community name.
Charles County's comprehensive plan says large-scale modern residential development began with construction of the St. Charles planned community in 1970. That dated fact defines local development history, not the age or radon condition of every home. Confirm the exact address under the st-charles-md service area, identify the individual dwelling, and explain its current levels and access controls. Planned-community names, village names and postal descriptions can overlap, so copy the service address directly from the transaction or occupancy record. Provide gate instructions, parking directions and a telephone contact only when they are actually needed. If several households share one structure, keep each request associated with its own unit. Community-wide planning history cannot answer which rooms belong to a particular occupant or who may authorize entry. A community association can supply rules or access information, but it cannot authorize entry for every privately occupied home. Determine whether the owner, renter, listing agent or management office has that authority. Explain alarms, pets and parking constraints in the booking details. If a home changes hands, make sure preparation directions reach the current occupants rather than only the future buyer. These steps connect a large planned development to one accountable measurement request. Preserve the punctuation and service slug distinction: the public name is St. Charles, while the URL key is st-charles-md. This prevents accidental substitution of another locality or a differently styled source label. In communications, write the human-readable community name and the complete property address. In data handling, keep the approved slug unchanged. That small editorial discipline supports accurate navigation, report matching and follow-up across a planned community containing many separately controlled residences. Bannister, Carrington, Dorchester, Hampshire, Sheffield and Fairway can orient readers, but none should be used as a proxy for the booked household's configuration.
Local background: Charles County Comprehensive Plan history of the St. Charles planned community, Maryland Department of Health radon guidance, EPA Map of Radon Zones.
01
The County dates large-scale development of the community to 1970. Each present-day residence still needs its own evidence because community history cannot supply an indoor reading.
02
Give the full address and unit so the appointment is tied to the intended dwelling. The planned-community label alone is not enough to define access or scope.
03
When a gate, owner, tenant or association controls entry, identify the person who can admit the technician for placement and retrieval.
Where we test in St. Charles, and what to tell us
Bannister, Carrington
Confirm the house or unit rather than using the broader planned-community name as the scope. If a tenant or another household controls a lower area, arrange permission before testing.
Dorchester, Hampshire, Sheffield
Explain how rooms on the lowest accessible levels are used now and what may change after a sale or move. Keep the selected space free of work that could disturb the monitor.
Fairway
For attached or managed housing, provide the unit designation and entry procedure for both visits. Another residence's report does not establish the radon level in the booked unit.
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. Charles County's 1970 date describes the start of large-scale community development. A test inside your specific St. Charles residence provides its radon result.
Use the complete street address and unit, if any, for the residence represented by the st-charles-md service page. Add the gate, tenant or management contact needed for both visits.
No. It records conditions in the home where the device was placed. Test the individual residence involved in your transaction or household decision.
State the intended use, such as sleeping, work or recreation, even if the room is unfinished or empty now. The technician considers potential regular occupancy when choosing the level.
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
