Skip to content
Home/Mold Testing/Charles County, MD
Mold testing
Samples taken in your home, analysed by an accredited laboratory. We do not sell remediation, so the report has nothing to sell you.
4.9 rating, over 4,000 reviews NAMRI-certified inspectors Serving all of Charles County
Schedule a mold test Call (703) 450-6398 Find your community
Three communities in the county have pages of their own with local detail. The packages, the prices and the laboratory are the same everywhere in the county, so you can also book straight from here.
Around the county seat, older in-town houses on modest lots sit close to newer subdivisions ringing the courthouse square.
Built out over decades under one master plan, its neighborhoods range from earlier villages to newer lots near the Fairway section.
Slab ranches, attached garages and townhouse rows spread along Smallwood Drive and the commercial corridors that grew up around it.
La Plata is the county's incorporated seat; St. Charles and Waldorf are unincorporated communities without their own town government. The same team, packages and prices cover all three.
Four options, depending on how much of the home you need looked at. Not sure which one fits? Start with the thirty minute visit and a technician will tell you what is actually worth testing. Decide to test while they are there and the visit is written up as a Mold Plus.
No sampling
"Something feels off and I do not know if testing is worth it."
$175
30 minutes on site
One area, tested
"I can see it, or I know exactly where to look."
$345
One targeted area, 1 to 2 hours
One area, plus the source
"There was a leak and I want to know where the water went."
$495
One targeted area, 1 to 2 hours
The whole home
"It could be anywhere, or it keeps coming back."
From $550
Priced by home size, 1 to 2 hours
* Prices shown are for Virginia and Maryland. In Washington DC, Mold Basic is $425, Mold Plus is $575, and Mold Advanced starts at $630. Mold Walk & Talk is $175 everywhere.
Charles County grew outward from La Plata's courthouse square along the roads that reach Waldorf and St. Charles. St. Charles was built out as one planned community under its own master plan instead of block by block, and much of the housing near it belongs to the decades after that plan took hold. Older farmhouses and crossroads settlements still stand alongside that newer growth, so a booking here starts from the same basics: the house's age, its foundation type, and whether the room in question sits over a slab, a crawlspace or a basement.
The county's own comprehensive plan places Charles County entirely within the Atlantic Coastal Plain, underlain by unconsolidated layers of sand, gravel, silt and clay that the plan dates to as much as 135 million years old. Those layers drain unevenly. A sandy stretch lets water through quickly while a clay lens nearby holds it at the surface, so two houses on the same road can behave differently in the same storm. On that ground, a technician looks at grading around the slab, the crawlspace vents on a rambler, and the plumbing chase a townhouse shares with its neighbor.
Local background: Charles County Government: The Charles County Comprehensive Plan (2016).
01
The county's comprehensive plan describes Charles County as sitting entirely on unconsolidated coastal plain sand, gravel, silt and clay, and those layers do not drain the same way from one yard to the next. A downspout that empties onto a sandy corner can look fine while the same water pools over a clay lens a few feet away, so the grading gets checked at the specific spot in question rather than the whole yard at once.
02
Much of the county's newer construction in St. Charles and Waldorf sits on a slab rather than a full basement, which puts the flooring and the drywall base directly against the foundation. A stain that starts at the baseboard usually points to moisture coming from underneath rather than from the room itself, and the report distinguishes between the two.
03
Many of the ranch and split-level houses built across St. Charles and Waldorf sit on a crawlspace rather than a full basement, and a vent that has been closed off or blocked by grading changes how much moisture collects underneath. A technician checks the vents and the ground cover as part of the visit, and the report notes whether the crawlspace was open or sealed at the time.
We do not remove mold, so we have nothing to gain from your results. If your report shows a problem, you choose who fixes it. Once the work is done, we can test again and tell you what we find.
For a Maryland property, define the question before ordering samples: a particular stain, persistent odor, water event or follow-up after repairs. Keep dated observations and laboratory findings with the repair history. A report does not determine health risks, insurance coverage or legal responsibility. Montgomery County also publishes separate radon requirements for covered home sales; confirm which rules apply to your transaction.
EPA sampling guidance; Montgomery County radon guidance. Current as of September 2026. General information, not legal advice.
Yes. The same team, packages and prices apply from La Plata's courthouse square through St. Charles and Waldorf, and each community page adds local detail you can book from directly.
No. La Plata is the county's incorporated seat, while St. Charles and Waldorf are unincorporated communities that share a Waldorf or La Plata mailing address. Give us the full street address when you book and the report will reflect the correct jurisdiction.
It can. The county's own planning documents describe ground that mixes sand, gravel, silt and clay and drains unevenly from one lot to the next. A visit is scoped to the specific room, foundation type and history described at booking, not to a general assumption about the ground under that part of the county.
The booking calendar shows real openings for each community on this page. If the property is under contract, add that timeline to the booking notes so the visit and the laboratory work can be arranged around it.
Real availability on the next screen. No call back required.
Schedule a mold test Request a price
NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398
