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Mycotoxin Contamination in a Residential Property
Visible Mould Growth

A homeowner contacted us after experiencing ongoing health problems, including difficulty breathing, headaches & chronic fatigue. During routine cleaning, they noticed visible mould growth in the bathroom and began to suspect mould exposure might be contributing to their symptoms. Concerned for their health and family safety, they requested a professional water-damaged building assessment along with environmental mould and mycotoxin testing.

The primary goal of the assessment was to:

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  • Investigate the root cause of mould growth and associated moisture ingress issues.

  • Conduct air and surface sampling to evaluate the presence of mycotoxins inside the home.

  • Assess the condition of the HVAC system to determine whether it was acting as a potential source of cross-contamination.

bathroom mould

Our investigation included:

  • Visual inspection of moisture-affected areas, particularly the bathroom with visible mould growth.

  • Thermal imaging, particle counting, and moisture mapping to locate hidden problem areas.

  • Air sampling for mould spores and mycotoxins.

  • Surface sampling from bathroom walls, ceilings, and other affected areas.

  • HVAC swab testing from ducting and filters, where mould byproducts often accumulate.

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All samples were submitted for laboratory analysis to confirm the presence and levels of mould and mycotoxins.

Mould on white wall

The laboratory results confirmed:

There were elevated levels of airborne mould spores in the bathroom and adjoining spaces.

Mycotoxins were detected on multiple surfaces, including bathroom walls, ceilings & dust samples from living areas.

Mycotoxins were also present within the HVAC system, indicating the risk of re-contamination throughout the home.

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These findings provided clear evidence of a widespread indoor contamination problem, extending beyond the visibly affected bathroom.

Remediation & Post-Remediation Verification (PRV)

Based on the results, a targeted remediation strategy was implemented:
 

  • Professional mould remediation in moisture-damaged areas with all affected materials removed and water/moisture ingress issues resolved.

  • Cleaning and sanitisation of HVAC components to remove mycotoxin residues.

  • Dehumidification and moisture control to prevent recurrence.


Following remediation, post-remediation mycotoxin testing was performed.
The results confirmed that mycotoxin levels had returned to within safe parameters & the HVAC system was free from contamination.


This verification provided the homeowner with peace of mind that their property was safe for re-occupancy.

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With mycotoxin sources identified and removed, the homeowner could live in a healthier indoor environment. The test results were also valuable to healthcare providers, offering environmental evidence that supported medical evaluation of the homeowner’s symptoms.

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Key Takeaways

  • Early testing for mould and mycotoxins can help identify hidden risks before they escalate.

  • HVAC systems are common reservoirs for mould spores and mycotoxins, often requiring professional cleaning.

  • Post-Remediation Verification testing is essential to confirm the effectiveness of any mould removal project.

  • Documented laboratory results provide a useful resource for healthcare professionals assessing potential mould-related illness.

Protect your health, your family & your home.

If you are experiencing unexplained health symptoms and suspect your home may be affected by mould or mycotoxins, contact us today for a professional water-damaged building and mycotoxin assessment

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