How Can I Know If I Have Mold In My Home ?
According to the CDC, if you see or smell mold, it should be removed.⁹
Unfortunately, for many current or prospective homeowners, identifying a mold problem isn’t always that straightforward. Mold is often hidden behind walls, under flooring, or within HVAC systems—especially during the home-buying process, when a property’s best features are naturally emphasized. That’s why we offer professional mold testing performed by a Certified Mold Assessor Technician, helping homeowners and buyers uncover hidden issues before they become costly, disruptive, or potentially harmful.
Mold Facts Most Homeowners Don’t Know
- Mold is extremely common in homes.
A population-weighted review of published studies summarized by CDC/NIOSH estimates that approximately 47% of U.S. homes show signs of dampness or mold, making mold one of the most common indoor environmental problems. [1] - Water problems are widespread.
U.S. Census data referenced in industry standards indicates that about 35% of homes have experienced water-related damage, one of the primary “red flag” conditions for mold growth. [2] - Mold can begin growing quickly.
When moisture is present, mold can begin growing within 24 hours and may start producing spores in as little as 5-7 days – often before homeowners are aware of a problem. [3] - Infants and young children are especially vulnerable.
Children under six years old can experience up to a 10× greater negative physiological impact from mold exposure due to higher breathing rates and developing immune systems. [4] - Older adults and immunocompromised individuals face higher risk.
People over 65, individuals with asthma or emphysema, diabetics, pregnant women, and those undergoing chemotherapy or radiation are more susceptible to severe reactions from mold exposure. [4][5] - Mold doesn’t have to be visible – or alive – to cause problems.
Even dead mold spores and fragments can trigger allergic and inflammatory responses when inhaled. [5][6] - Some molds produce toxic chemical compounds called mycotoxins.
Common indoor molds such as Aspergillus, Penicillium, Stachybotrys, Fusarium, and Alternaria are known mycotoxin producers, which can affect nearly anyone under the right conditions. [4][6] - Killing mold does not eliminate its risk.
Industry standards confirm that killing mold does not remove its allergenic or toxigenic properties – physical removal and proper cleaning are critical. [7] - Dampness and mold are linked to respiratory issues.
Research summarized by CDC, WHO, and Lawrence Berkeley National Laboratory indicates that up to 21% of current asthma cases may be attributable to dampness and mold exposure in indoor environments. [8] - Modern homes are more prone to mold than ever before.
Since the 1970s, tighter building envelopes, reduced air exchange, and shorter HVAC run times have increased indoor moisture retention. Without supplemental dehumidification, indoor humidity often exceeds
the EPA-recommended 30%–50% range needed to help prevent mold growth. [5][6]
Why testing matters: Mold is often hidden, symptoms vary widely, and visual inspections alone are not enough.
Professional mold testing helps identify conditions that may impact indoor air quality, risk factors, and long-term property value.
Mold...often undetected unless tested.
What Our Clients Say...
We offer state of the art AI-powered mold testing for air or surface samples in any home or building. Our reports are designed for the homeowner or home purchaser and are easy to understand. Where other companies’ mold testing reports can often be overly dense and confusing, below are some of the ways in which our mold reports stand apart.
Reports that make sense.
Images of actual spores
(from an air or surface sample gathered by your Certified Mold Assessor Technician.)
Clearly communicated results and areas of concern
Is there a mold problem? If so, where?
Simple breakdown of the particular objects observed during testing
Since there are many different kinds of mold, it can be helpful to pinpoint which 'notable objects' are present in your current / future home.
How it Works
Sampling
3 (or more, as needed) samples are taken, which always includes the initial outdoor air sample. This outdoor air sample is essential for establishing a 'normal' against which the indoor samples can be evaluated in order to determine whether elevated mold levels are observed in the home.
AI-Assisted Analysis
Once samples have been collected, your inspector will send them to the lab. The samples will be digitized and analyzed using powerful AI technology (trained on hundreds of thousands of images). Once the AI presents the results, a lab analyst confirms them and generates the report.
Results
Your home inspector will then send you this report, which contains real images of detected mold spores and particulate, pinpoints the mold arising from water damage, and highlights any elevated levels for your attention and action.
Lab Director: Dylan McIntosh
- CIH (certified industrial hygienist)
- PAACB (Pan American Aerobiology Certification Board)
- McCrone Research Institute graduate
- Managed an environmental lab in Chicago for 8 years
- Performed hundreds of home and building inspections
Expert Advisor: John Haines
- Sr. mycology scientist, New York State Biological survey (retired)
- Instructor at the McCrone Research Institute
- World leading mycologist
Blog posts related to mold testing
Unmasking the Silent Threat: 3 Compelling Reasons to Prioritize Mold Testing
Discover three reasons why homeowners and homebuyers should prioritize mold testing. From safeguarding your health to arming yourself with knowledge and negotiating power in the home buying process, this article explores the importance of early detection and the benefits it brings. Unmask the silent threat of mold and ensure a healthier home environment for you and your household.
Why Mold Testing Should Always Be Accompanied By an Inspection
Being that the Centers for Disease Control and Prevention (CDC) emphasizes the importance of physical inspection in conjunction with mold sampling, as well as addressing the underlying causes of the mold growth, qualified home inspectors are well-placed to perform such mold testing. In this article, we’ll discuss why mold sampling should always be done in conjunction with inspection.
Sources & References:
- CDC / NIOSH – Population-weighted estimates of dampness and mold in U.S. housing: NIOSH Dampness and Mold Assessment Tool (DMAT)
- U.S. Census Bureau – Housing water damage statistics (referenced in industry standards): American Housing Survey (AHS)
- EPA – Mold growth timelines and moisture conditions: EPA Mold Resources
- Certified Mold Assessor Technician Training Materials – Health risk groups, children exposure factors, mycotoxins, and mold behavior (referencing ACGIH, EPA, CDC, WHO).
- CDC – Mold health effects and susceptible populations: Mold | CDC
- World Health Organization – Indoor air quality and mold health impacts: WHO Guidelines for Indoor Air Quality: Dampness and Mould
- IICRC S-520 – Mold remediation and removal standards: IICRC S-520 Standard
- Lawrence Berkeley National Laboratory – Asthma burden attributable to dampness and mold: Health-Related Costs of Dampness and Mold
- Centers for Disease Control and Prevention: About Mold