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Real Mold Inspection Case Studies in Dallas-Fort Worth

Anonymized case studies drawn from actual mold assessments and inspections. Conditions vary from property to property, and findings from one case should not be assumed to apply elsewhere. Mold Testing Dallas is an independent mold assessment company.

14 published casesHVAC & Air Distribution Water Damage Bathrooms Home Purchases New Construction Commercial Properties Hidden Mold
Surface growth on an uninsulated AC condensate drain line in a Dallas attic

Mold on an AC Condensate Drain Line in a Dallas Attic

A Dallas homeowner requested an independent assessment after an HVAC technician noticed suspected growth on attic condensate piping. A surface swab supported fungal growth on the pipe exterior; no visible mold growth was observed inside accessible portions of the air handler or connected ductwork.

Dallas, Texas · Single-family residential · HVAC & Air Distribution

  • ac condensate line
  • hvac
  • attic
  • cladosporium
  • surface sampling
  • condensation
  • air handler
  • pvc drain line
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White and gray surface colonization on the accessible interior HVAC supply-plenum liner

Mold Found Inside an HVAC Supply Plenum in a Dallas Home

A Dallas homeowner requested an independent assessment after an HVAC professional reported suspected growth inside an attic supply plenum. Accessible fiberglass duct-board liner showed extensive surface colonization. Surface swabs supported fungal growth inside the plenum and on a downstream living-room supply grill. No air samples were collected.

Dallas, Texas · Single-family residential · HVAC & Air Distribution

  • hvac
  • supply plenum
  • duct board
  • air vent
  • supply grill
  • cladosporium
  • aspergillus penicillium like spores
  • surface sampling
  • attic
  • air handler
  • mold in hvac
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Dark discoloration along the sampled rear interior seam of a bathroom vanity

Mold Found Inside a Bathroom Vanity After a Persistent Musty Odor

A homeowner reported persistent musty odors in three adjoining or vertically stacked bathrooms. In Bathroom #1, an accessible rear vanity seam showed discoloration and its surface swab supported fungal growth. Its air sample contained more than 8,000 Aspergillus/Penicillium-like spores/m³, unlike the other two bathrooms tested. The specific moisture source was not confirmed.

Dallas, Texas · Single-family residential · Bathrooms

  • bathroom mold
  • vanity
  • hidden mold
  • musty odor
  • aspergillus penicillium like spores
  • air sampling
  • surface sampling
  • moisture
  • bathroom cabinet
  • under sink
  • water intrusion
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Existing repair opening exposing stained wallboard and framing inside a guest bedroom closet

Mold Found Inside a Wall After a Plumbing Leak in Farmers Branch

A Farmers Branch homeowner requested a limited mold assessment after a reported plumbing leak affected a wall shared by a guest bathroom and two closets. The leak had reportedly been repaired, but existing repair openings exposed stained wallboard and framing. A swab through the guest bedroom closet opening supported fungal growth on sampled material. Separate ceiling and former exterior-wall concerns had different, more limited findings.

Farmers Branch, Texas · Single-family residential · Water Damage

  • plumbing leak
  • hidden mold
  • wall cavity
  • water damage
  • chaetomium
  • aspergillus penicillium like spores
  • drywall
  • framing
  • bathroom
  • closet
  • moisture
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Stained wet carpet at the sampled Dallas bedroom location beside a moisture meter showing its maximum comparative response

Mold and Water Intrusion From Landscape Irrigation in a Dallas Bedroom

A Dallas homeowner noticed visible growth on a guest-bedroom nightstand foot. A limited assessment found two wet carpet and lower-wall zones along the exterior wall, aligned horizontally with two exterior areas showing algae-like growth. A swab of one stained wet carpet area supported fungal growth, including Heavy Chaetomium and Heavy hyphal fragments. Landscape irrigation was identified as the probable recurring moisture source; the precise route of water entry was not confirmed.

Dallas, Texas · Single-family residential · Water Damage

  • irrigation
  • sprinkler
  • exterior water intrusion
  • brick veneer
  • wet carpet
  • wet drywall
  • chaetomium
  • bedroom mold
  • landscape drainage
  • mortar joint
  • grade
  • hidden moisture
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Visible dark growth on the face and louvers of the sampled left playroom HVAC supply grill

Mold Found Inside One HVAC Duct Branch in a Dallas Home

A Dallas homeowner requested an independent assessment after an HVAC contractor saw material inside supply ductwork that might have been microbial growth or dirt. Two playroom supply grills and accessible interior surfaces behind them showed visible growth. Both grills shared one duct branch with damaged jacket and insulation; the accessible air handler and other inspected runs showed no comparable growth. A swab from the left playroom grill returned Heavy Cladosporium, while the playroom air sample did not show amplification relative to an outdoor comparison at the sampled time.

Dallas, Texas · Single-family residential · HVAC & Air Distribution

  • hvac
  • ductwork
  • flex duct
  • supply vent
  • supply grill
  • cladosporium
  • borescope
  • attic
  • duct leakage
  • air sampling
  • damaged duct
  • mold in air ducts
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Exposed framing, concrete floor and an HVAC grille after flood-cut work in a water-affected Fort Worth home

Mold Found After an AC Condensate Drain Overflow in a Fort Worth Home

A reported HVAC condensate-drain backup flooded the HVAC closet and adjoining rooms of a Fort Worth attached duplex residence while the homeowner was away. A restoration contractor had already made flood cuts and removed portions of flooring before the mold assessment. Six surface samples documented different findings across the affected areas: Heavy Stachybotrys at the HVAC-closet concrete-floor surface, Heavy Chaetomium at a water-affected bedroom wall, and Heavy Cladosporium with Heavy hyphal fragments on a bedroom supply register. No air samples were collected.

Fort Worth, Texas · Residential; one half of an attached duplex, slab-on-grade · Water Damage

  • ac condensate
  • condensate drain
  • water damage
  • stachybotrys
  • chaetomium
  • cladosporium
  • flood cuts
  • hvac closet
  • air handler
  • supply register
  • bedroom
  • restoration
  • slab
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Master-closet corner with removed flooring and exposed concrete slab after a prior water event

Hidden Mold Concern After an Undetected Water Leak in a Dallas Home

A Dallas homeowner requested an assessment after several past water events, including a master-closet leak that reportedly went undetected for a time and left stored belongings with visible mold. By inspection, the belongings and flooring were gone, the slab was exposed, and no visible mold appeared on accessible master-closet surfaces. A 5-liter air sample from the previously affected corner had the highest fungal finding among four sampled wall cavities. Two other 5-liter cavity samples had no mold detected. The closet wall was not opened, so the condition of concealed materials remained undetermined.

Dallas, Texas · Single-family residential · Hidden Mold

  • wall cavity
  • hidden mold
  • water damage
  • master closet
  • old leak
  • cavity air sampling
  • cladosporium
  • aspergillus penicillium
  • fusarium
  • moisture intrusion
  • concealed mold
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Mold Found Below a Leaking Mini-Split

A commercial client in Waco, Texas requested a limited mold assessment after an employee raised concern about possible mold in a work area. The assessment focused on two rooms. In the Front Room, a wall-mounted mini-split was actively dripping, with evidence of water traveling down the wall to the floor line. Surface testing confirmed fungal growth behind the flexible cove base below the mini-split. Air samples from both rooms were below the outdoor reference and did not indicate airborne fungal amplification at the sampled locations and time.

Waco, Texas · Commercial manufacturing facility · Commercial Properties

  • mini split
  • ductless ac
  • condensate leak
  • commercial mold
  • cove base
  • wall mold
  • aspergillus penicillium
  • alternaria
  • stachybotrys
  • ulocladium
  • air sampling
  • surface sampling
  • hvac moisture
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Hidden Mold Found Inside Wall Cavities in a Dallas Home

A Dallas homeowner requested a limited assessment after concerns about possible concealed mold and prior water-damage conditions. Occupied-room air samples were below the outdoor reference, while two concealed wall cavities had substantially different findings. One cavity showed moisture abnormalities, deteriorated finishes and apparent growth by borescope; a second cavity returned more than 55,000 total fungal structures per cubic meter when re-sampled after its first sample was occluded. An upstairs storage area also showed moisture and apparent growth.

Dallas, Texas · Single-family residential · Hidden Mold

  • hidden mold
  • wall cavity
  • aspergillus penicillium like spores
  • borescope
  • water damage
  • bathroom wall
  • kitchen wall
  • built in cabinet
  • air sampling
  • wall cavity sampling
  • surface sampling
  • moisture
  • dallas
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Mold Found Inside a Bathroom Exhaust Duct in Grand Prairie

A homeowner requested evaluation of suspected mold in two bathroom shower areas and inside a downstairs bathroom exhaust vent. Surface samples from the upstairs shower, downstairs shower, and exhaust duct returned Minor fungal findings in the shower samples, which were not interpreted as active mold growth, and Heavy Cladosporium with Moderate hyphal fragments on the sampled interior duct surface.

Grand Prairie, Texas · Residential · Bathrooms

  • bathroom exhaust duct
  • bathroom vent
  • cladosporium
  • surface sampling
  • shower staining
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Pre-Drywall Mold Inspection of a New Construction Home in Allen

A buyer requested a mold and moisture evaluation of a new-construction home before drywall installation. No visible mold growth was observed on accessible framing; the primary concern was moisture in portions of the framing, with readings reaching approximately 22%.

Allen, Texas · New-construction home · New Construction

  • new construction
  • pre drywall
  • framing moisture
  • wood framing
  • home buyer
  • allen
  • mold inspection
  • construction moisture
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Wall-Cavity Mold Testing During a Dallas Real Estate Transaction

A mold assessment was requested during a Dallas real estate transaction after a prior property inspection identified a moisture concern in a third-floor bedroom wall. The wall was dry, and two targeted wall-cavity samples found no evidence of elevated or unusual fungal activity in the tested wall cavity.

Dallas, Texas · Single-family residential · Home Purchases

  • real estate
  • home buyer
  • wall cavity
  • hidden mold
  • dallas
  • option period
  • moisture concern
  • due diligence
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Highly Elevated Mold Spores After Flooring Removal in a Frisco Home

A Frisco homeowner requested an assessment after a contractor discovered an older flooring layer beneath a newer flooring system during planned replacement. The contractor had removed the flooring and underlayment the day before inspection, so those materials were no longer available to evaluate. No visible growth, musty odor or active leak was found, and readings on the exposed slab were not elevated. Nevertheless, the front-room air sample returned >33,000/m³ Aspergillus/Penicillium-like spores and >34,000/m³ total fungal structures. The airborne findings were consistent with a recently disturbed source, not direct confirmation of mold on the discarded materials.

Frisco, Texas · Residential home · Water Damage

  • flooring
  • aspergillus penicillium
  • air sampling
  • demolition
  • frisco
  • hidden mold
  • subfloor
  • floor replacement
  • elevated spores
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