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Home/Mold Testing/Prince William County, VA
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 Prince William County
Schedule a mold test Call (703) 450-6398 Find your community
Nine 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.
Neighborhoods along the tidal Potomac and the Occoquan sit closest to the water table, while those further inland face more ordinary drainage questions.
Its colonial waterfront core sits well above the modern shoreline, with newer subdivisions spread inland from Quantico Creek's narrow, sediment-filled channel.
One homeowners association covers everything from single-family houses to apartment buildings, so a technician needs the unit type before the visit.
Built around a large private lake, its waterfront lots face different grading questions than the streets set back several blocks inland.
Housing here arrived in waves of separately zoned subdivisions, so a crawlspace foundation can sit two streets from a poured basement.
As an independent city inside the county, its downtown railroad-era frame houses stand a few streets from newer subdivisions with different foundations.
This small independent city grew up almost entirely in one stretch of years, so most of its townhomes share a similar age of framing.
Newer golf-course subdivisions sit close to an older, informally platted area near Carver Road, so foundation age varies sharply within a short drive.
Wartime fire destroyed most of the old town, so its historic-looking streets and its newer golf-course subdivisions are closer in age than they appear.
Manassas and Manassas Park are independent cities inside Prince William County's boundary, governed separately from the county itself. Bookings, packages and pricing work the same for both as for the rest of the 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
"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.
Prince William County grew from two centers at once. The railroad towns of Manassas and Manassas Park anchored the middle of the county long before the rest of it filled in, while Woodbridge, Dale City and Lake Ridge grew along the Potomac and the Occoquan as postwar subdivisions pushed south from Washington. Gainesville and Haymarket, toward the Bull Run Mountains, carry the newest large-scale construction, arriving well after the eastern half of the county was already settled. That east-west split matters more than any single neighborhood name: established grading and older framing toward the river, newer foundations and unsettled yards toward the mountains.
Prince William County's own building department sorts its soils into three engineering categories, and its guidance puts roughly 40 percent of the county into the two categories that call for extra engineering: high groundwater, floodplain ground, compressible soil and marine clay among them. That ground concentrates toward the tidal reaches of the Potomac and the Occoquan, where a crawlspace built above the water table is more common than a full basement. Toward Gainesville and Haymarket, closer to the Bull Run Mountains, the soil drains faster and the questions shift to grading around newer foundations and the well and septic systems that serve some of those lots.
Local background: Prince William County Department of Development Services: Soil Categories (2009).
01
Prince William County's own soil guidance lists marine clay, floodplain ground and high groundwater together as the conditions that complicate a foundation. On the eastern side of the county a crawlspace or a basement wall gets the closer look for that reason, and the report describes the grading and the drainage a technician actually saw beside the house.
02
Lake Ridge and Montclair each sit on a reservoir or a private lake, and fill brought in to level a waterfront lot does not always drain the way the surrounding grade does. A technician photographs that grading and checks whether a sump or a French drain already carries water from the lower level, and says so in the report before any sample is taken.
03
Construction around Gainesville and Haymarket sits on soil that drains faster than the marine clay closer to the Potomac, so a musty smell there is less often a foundation issue and more often a plumbing or roofing one. Well and septic systems serve some of these newer lots, and a technician asks about both before treating a damp room as a grading problem alone.
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.
Virginia's residential disclosure statement advises buyers to exercise due diligence, including considering a mold assessment conducted by a business following EPA guidance. Confirm the scope and timing with your agent before settlement. A laboratory sample documents a selected place and time; it does not certify an entire home as mold-free or replace advice about your transaction.
Va. Code section 55.1-703. Current as of September 2026. General information, not legal advice.
Yes. The same team, packages and prices apply from the tidal Potomac at Woodbridge to Haymarket at the county's western edge, and that includes the independent cities of Manassas and Manassas Park inside the county's boundary. Give the full street address when booking so the report names the correct jurisdiction.
Not automatically. The county's own soil guidance groups marine clay with floodplain ground and high groundwater as conditions that complicate a foundation, which describes how the ground holds and moves water rather than predicting a mold finding. A house on that ground with a well-graded, dry basement can test clean, while a house on better soil with a failed sump does not. The sample results describe what is actually in the air and on the surfaces of a particular house.
Newer construction near the Bull Run foothills sits on faster-draining ground than the county's eastern half, so a clean history is a reasonable expectation there rather than a guarantee. A sample taken before move-in or before finishes go up still establishes a baseline, ahead of any landscaping changes to the grading around the house.
No. Every community listed on this page books through the same scheduling page and the same pricing. The community links describe local conditions; they do not divide the service area into separate territories.
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
