Types of Toxic Mold

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There are over 100,000 different species of mold.  Not all molds are harmful.  The following is a list of the most common and dangerous molds encountered in either homes, schools, or workplaces.


This strain is commonly referred to as “black mold” because of its appearance.  Stachybotrys, followed closely by Chaetomium, is the most dangerous mold to human health.  In fact, some experts believe that once Stachbotrys has infiltrated a property, it can never be fully remediated.

The most common symptoms from exposure are flu-like symptoms such as a sore throat, diarrhea, and headache.  Stachybotrys is especially dangerous in young children. Reports of pulmonary hemorrhaging have been reported.

This species of mold is particularly troublesome, as bleach is ineffective in remediating and decreasing the humidity levels in the environment, only increasing the spore release.


Chaetomium is a dangerous mold that little about which is known. This species of mold is characterized by a strong musty odor while thriving in water damaged drywall. Exposure to Chaetomium results in classic mold related symptoms with permanent neurological damage, auto-immune disease, and permanent DNA damage being reported.


Aspergillus is a quite common species encompassing hundreds of sub-variations. Along with Penicillium, it is the most common mold found in water damaged indoor environments. The symptoms generally include asthmatic sensitivity and pulmonary infections. Aspergillus is also known to be parasitic in humans.


Along with Aspergillus, this is the most common mold found in water damaged indoor environments.  The most common symptom is asthmatic sensitivity.  Acute symptoms include edema and bronchitis while chronic symptoms include pulmonary emphysema.