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Home/Mold Testing/Baltimore 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 Baltimore County
Schedule a mold test Call (703) 450-6398 Find your community
Twelve 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.
Bungalow and cottage streets from the old turnpike era sit blocks from newer subdivisions built well into the twentieth century.
Older crossroads dwellings share a corridor with ranch and split-level houses raised during the postwar building years.
Townhouses inside planned communities share walls with newer construction rising along the commercial corridor near the highway.
Curving streets platted for a nineteenth century summer resort now carry additions, sunrooms and garages built decades later.
A Main Street of older houses gives way to a resort-era village and newer subdivisions further from downtown.
Streetcar-era cottages and garden apartments sit alongside later subdivisions built out toward the county's western edge.
Company-built duplexes from a single wartime push stand along curved streets close to newer infill near the water.
Small wartime cottages and postwar additions sit along tidal creeks where crawlspaces and bulkheads take the brunt of high water.
Older bungalows near the reservoir valley give way to newer streets built closer to the city line.
Homes backing wooded parkland sit alongside newer mixed-use construction and active community associations further from the tree line.
Detached houses, brick rowhomes and managed condominium buildings sit within a few miles of each other near the county seat.
Formstone rowhouses, older houses split into apartments, and harbor condominium towers each carry water through the building differently.
Baltimore City is an independent city that Baltimore County borders on three sides rather than contains. It appears on this page because a Baltimore mailing address is what a homeowner searches, even when the house sits inside the county line.
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.
Baltimore County grew up around the city it does not include. Streetcar lines pulled Catonsville, Towson and Woodlawn into brick and frame neighborhoods before most households owned a car, and the postwar decades filled Dundalk, Essex, Parkville and Randallstown with duplexes, ranches and split-levels built quickly along new roads. Later growth pushed further out again, into planned communities at Owings Mills and Perry Hall, townhouse sections at Reisterstown, and denser infill closer to the Beltway at Pikesville. A house here can date from any one of those building waves, and the decade it was built usually says more about how water moves through it than the zip code does.
Maryland Geological Survey Bulletin 17 places Baltimore County in two physiographic provinces, Piedmont schist, gneiss and marble to the northwest and Coastal Plain sand, gravel and clay in the southeast, divided along the Fall Line. On the Piedmont side, a foundation set into that bedrock and the crawlspace built over it are the first places water tends to sit. Toward the water, the ground flattens and sits nearer the tide, so basements, bulkheads and low crawlspaces near Dundalk and Essex get the closer look. Shared-wall townhouses add a third variable wherever they stand, since a leak two doors down can surface as a stain on a wall that was never touched.
Local background: Maryland Geological Survey: Water Resources of Baltimore and Harford Counties, Bulletin 17 (1956).
01
Piedmont bedrock covers most of Baltimore County, but the southeast corner sits on Coastal Plain sediment instead. A technician notes which side of that line a house sits on before deciding where a crawlspace or foundation wall needs a closer look.
02
Rowhouses in the city and townhouses in Owings Mills or Reisterstown share more than a wall. A stain that does not match the unit's own plumbing gets samples from both sides of that wall, and the report says so.
03
Dundalk and Essex sit closer to tidal creeks than the rest of the county, and a low crawlspace or unfinished basement there behaves differently after a heavy storm. The visit covers bulkhead condition, crawlspace height and any waterline left on a foundation wall.
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 cover the county from Catonsville and Randallstown in the west to Dundalk and Essex in the east, plus Towson and the communities around it. Book from any community page on this list or from here; the appointment lands with the same technicians either way.
It depends on the actual boundary line, not the mailing address. The United States Postal Service uses Baltimore as the city name for many county zip codes, so a Catonsville or Parkville address can still read Baltimore, MD on an envelope. Give us the full street address and we will confirm which government the property falls under before the visit.
It changes where the technician looks first, not what gets tested. A house on Piedmont bedrock in the west and a house on Coastal Plain ground near Dundalk both get air and surface samples where the moisture history points, and the same laboratory processes both.
Use the scheduling page for real appointment openings, and put the settlement date in the booking notes so the visit and the laboratory work can be planned around it. Every community on this page sits inside our regular service area.
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
