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Home/Mold Testing/Montgomery 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 Montgomery County
Schedule a mold test Call (703) 450-6398 Find your community
Fourteen communities across the county have a page of their own with local detail. The packages, the prices and the laboratory are the same in every one of them, so you can also book straight from here.
Bethesda mixes postwar brick colonials with condominium towers, so a building's age often changes more block to block than mile to mile.
Chevy Chase's early planned streets now fall under several separate town governments, each with its own permitting history.
Silver Spring runs from a dense downtown core out to older streetcar-era suburbs and basement apartments carved into single family houses.
Takoma Park's tree-lined streets carry Victorian-era frame houses, brick bungalows and garden apartments within a few blocks of each other.
Kensington's Victorian rail suburb core gives way to postwar streets built closer to Rock Creek Park's stream valley.
The county seat spans a historic downtown, mid-century neighborhoods and newer construction around the Town Center and King Farm.
Aspen Hill's Georgia Avenue corridor pairs older garden apartments with single family streets from several different building decades.
Potomac's large lots along the river and its rustic roads sit farther from public water and sewer lines than most of the county.
Gaithersburg's planned communities and older downtown sit along the I-270 corridor, with houses from many different decades close together.
Germantown's subdivisions arrived in successive waves after the interstate corridor opened, so a house's age can vary sharply within one neighborhood.
Clarksburg anchors the I-270 corridor's north end, where an older crossroads village sits beside a still-expanding planned town center.
Montgomery Village's original neighborhoods sit around its planned lakes and parks, while apartment and condominium buildings fill in the newer sections.
Rockville, Gaithersburg and Takoma Park are incorporated cities inside the county, and Chevy Chase divides into several small municipalities plus an unincorporated area. All of them are served the same way, with the same packages and prices.
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.
Montgomery County's housing built out in rings that widen from the District line. The oldest streets sit close to the Beltway, in Bethesda, Chevy Chase, Silver Spring and Takoma Park, several of them platted as separate railroad and streetcar suburbs before they were folded into the county's growth. The I-270 corridor carried the next wave north through Rockville, Gaithersburg, Germantown and Clarksburg, filling in with planned communities across several decades. Beyond that corridor, Olney and Damascus sit against the county's Agricultural Reserve, where older farmhouses and newer subdivisions share the same rural roads.
Close to the District line, finished basements, window wells and shared walls between rowhouses, townhouses and garden apartments are where a technician looks first. Farther out, the county's own guidance on private wells and septic systems notes that both depend on the soil and rock conditions under a specific property, which matters on the well and septic lots common in Potomac, Olney and Damascus. Stream valley parks thread through much of the county, so a crawlspace or a walk-out lower level near one of those valleys gets checked for grading and standing water as closely as the foundation itself.
Local background: Montgomery County Department of Environmental Protection: Private Well and Septic Service.
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Many Montgomery County neighborhoods back onto a protected stream valley, and a lot that slopes toward one can hold water longer after a storm. A visit photographs the grade at the back of the house and notes how close the valley sits to the foundation, so the report ties any dampness to what a technician can actually see.
02
Potomac, Damascus and other outer county properties often run on a private well and septic system rather than public utilities. That does not change the sampling plan, but it often comes with a detached structure, a well house or a crawlspace that gets the same close look as any other space with limited airflow.
03
Aspen Hill, Silver Spring and other inner county communities carry a mix of garden apartment buildings and townhouses with shared plumbing stacks or party walls. When a stain travels through one of those shared connections, a sample from the neighboring side can show whether the source sits inside the unit or next door, and the report records which side each sample came from.
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. Every community on this page, from Bethesda and Silver Spring near the District line to Damascus and Clarksburg near the county's northern edge, is inside the regular service area, and the pricing does not change by zip code. Book from this page or from any single community's page; both routes reach the same team.
No. Chevy Chase Village, the Town of Somerset and the other small municipalities each handle their own permitting, but none of that changes the booking, the visit itself or what gets tested. Mention the specific village or town name along with the county when you book, so the paperwork lines up with the right local government.
Not directly. A private well affects drinking water, not mold in the air or on a surface, so it does not change the sampling plan by itself. What does matter is what a well and septic lot often comes with, such as a walk-out lower level, a detached structure or a crawlspace, and those get described the same way any other lower level would.
Yes. A stream valley park at the back of a lot can affect grading and how quickly water leaves the yard after a storm, especially on a walk-out lower level. Mention it when you book, along with any history of standing water, so the visit can look at the grade along with the usual interior checks.
Real availability on the next screen. No call back required.
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NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398
