Home/Mold Testing/Montgomery County, MD
Mold testing
Mold Testing in Montgomery County, MD
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
Where we test in Montgomery County
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 to Takoma Park, near the District line
- Bethesda
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
Chevy Chase's early planned streets now fall under several separate town governments, each with its own permitting history.
- Silver Spring
Silver Spring runs from a dense downtown core out to older streetcar-era suburbs and basement apartments carved into single family houses.
- Takoma Park
Takoma Park's tree-lined streets carry Victorian-era frame houses, brick bungalows and garden apartments within a few blocks of each other.
- Kensington
Kensington's Victorian rail suburb core gives way to postwar streets built closer to Rock Creek Park's stream valley.
Central Montgomery: Rockville to Potomac
- Rockville
The county seat spans a historic downtown, mid-century neighborhoods and newer construction around the Town Center and King Farm.
- Aspen Hill
Aspen Hill's Georgia Avenue corridor pairs older garden apartments with single family streets from several different building decades.
- Potomac
Potomac's large lots along the river and its rustic roads sit farther from public water and sewer lines than most of the county.
The I-270 corridor
- Gaithersburg
Gaithersburg's planned communities and older downtown sit along the I-270 corridor, with houses from many different decades close together.
- Germantown
Germantown's subdivisions arrived in successive waves after the interstate corridor opened, so a house's age can vary sharply within one neighborhood.
- Clarksburg
Clarksburg anchors the I-270 corridor's north end, where an older crossroads village sits beside a still-expanding planned town center.
- Montgomery Village
Montgomery Village's original neighborhoods sit around its planned lakes and parks, while apartment and condominium buildings fill in the newer sections.
Up-county: Olney and Damascus
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.
How much does mold testing cost in Montgomery County?
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
Mold Walk & Talk
"Something feels off and I do not know if testing is worth it."
$175
30 minutes on site
- Time with an environmental technician
- Moisture meter and thermal camera
- Findings explained on the spot
- Each additional 30 minutes $95
- No samples or laboratory work
One area, tested
Mold Basic
"I can see it, or I know exactly where to look."
$345
One targeted area, 1 to 2 hours
- Indoor sample plus outdoor comparison
- Accredited laboratory analysis
- Written laboratory report
- Additional samples $95 each
One area, plus the source
Mold Plus
"There was a leak and I want to know where the water went."
$495
One targeted area, 1 to 2 hours
- Everything in Mold Basic
- Moisture and thermal evaluation of the area
- Read Your Mold Report guide
- Each additional area $50 plus its $95 sample
The whole home
Mold Advanced
"It could be anywhere, or it keeps coming back."
From $550
Priced by home size, 1 to 2 hours
- Whole home moisture and thermal evaluation
- Sampling in the areas that call for it
- Read Your Mold Report guide
- Post-remediation re-test $295 held 3 months
* 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.
Where moisture can hide in Montgomery County homes
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.
Montgomery County's private-well and septic guidance concerns the systems serving a property; it does not determine an indoor mold sampling plan. For a Bethesda basement, Potomac outbuilding or Silver Spring shared-wall unit, explain the affected room, known water history and access available. The mold package sets the visit's services, and any separate utility or neighboring-unit concern should be discussed before booking.
Local background: Montgomery County Department of Environmental Protection: Private Well and Septic Service.

01
Stream valley parks behind the lot
If a Montgomery County lot backs onto a stream valley, report any actual pooling, lower-level water entry or completed drainage work. A park behind the house does not identify the source of dampness indoors. Describe the affected room and confirm which moisture services are included in your chosen package.
02
Private wells and septic on larger lots
For a Potomac, Damascus or other property with private utilities, list the specific building and room with a concern. A well house, detached structure or additional crawlspace is not automatically included with the residence. Discuss those areas and any separate water-quality question with the office before booking.
03
Shared plumbing in garden apartments and townhouses
For a garden apartment or townhouse in Silver Spring, Aspen Hill or elsewhere in the county, identify the stain and any known leak history. A mold sample does not establish which unit caused a leak. Neighboring-unit access and any additional samples require an agreed scope and the appropriate property permission.
We only perform testing, not remediation.
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.
Before you book in Maryland
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 Code: radon testing for home sales. Current as of September 2026. General information, not legal advice.
Mold testing near Montgomery County
Mold testing in Montgomery County, answered straight
Do you test for mold across all of Montgomery County?
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.
Chevy Chase has several small town governments. Does that change how you handle a booking?
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.
My Potomac house is on a private well. Does that change what gets tested?
A private well does not by itself establish a need for mold sampling. Tell the office if the concern is in a room, near pump equipment or in a separate building. Drinking-water testing and well or septic evaluation are separate services, and additional spaces are not automatically included with a mold package.
Our lot backs up to one of the county's stream valley parks. Is that worth mentioning before a visit?
Mention any known water entry, standing water or completed drainage work, along with the affected room and the location of the stream valley. That history can help explain your concern, but it does not identify the moisture source. Confirm the package and accessible areas with the office.
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NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398