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Is All Mold Dangerous?

Mold and Your Mental Health

For years, there’s been evidence to suggest that mold worsens allergy and asthma conditions in patients suffering from these respiratory conditions. While there are different types of mold, which ones are the most dangerous for someone suffering from respiratory issues or weakened immune systems?

Different Categories of Mold

While there are different types of mold, the most common types of household mold typically fall into one of three categories.


Mold that falls into this category is not toxic but can cause an allergic reaction or trigger the onset of an asthma attack.


These molds are dangerous to patients who suffer from already compromised respiratory systems. Pathogenic molds can also cause illness in people with pre-existing health conditions.


These mold types are able to self-produce toxins triggering very serious health issues, especially for those with vulnerable immune systems.

Common Mold Found in the Household

Here are some of the more common types of mold found in homes, especially homes with water or excessive moisture problems. Alternaria (Allergenic) Alternaria is the most common of the allergenic molds. It triggers allergic reactions, including asthma attacks, especially in those with weakened immune systems. This common mold is found primarily in wet bathrooms and around poorly sealed windows which tend to accumulate condensation. Chaetomium (Allergenic) Most commonly found in houses with serious water problems such as flooding or on-going, unresolved wet conditions. This mold starts out white but over time can turn very dark. It’s often confused with and can grow alongside toxic black mold. Ulocladium (Allergenic) This allergenic mold is also often mistaken for toxic black mold. Fortunately, it’s not nearly as dangerous. Much like other mold types, a great deal of moisture is needed for Ulocladium to thrive. Most common spots for this mold to show up are in wet bathrooms, leaky appliance hoses and poorly sealed windows. It can also be found growing on carpet and drywall. Aspergillus (Pathogenic) Some types of mold in this category, although non-toxic, trigger the same respiratory problems as the others. These respiratory issues include asthma, allergies, and lung irritation and infections. Aspergillus is found in the air we breathe and nests in HVAC systems. The presence of this mold is more pronounced in buildings that have sustained significant water damage. Stachybotrys (Toxigenic) Stachybotrys is more commonly known as toxic black mold, found anywhere it’s damp throughout homes. Ventilation systems are a breeding ground for toxic black mold. Two of the most common types of toxic black mold are stachybotrys chartarum and stachybotrys chlorohalonata, which are both a result of excessive moisture in the home along with poor air quality and ventilation. Toxic black mold triggers asthma attacks and other respiratory distress. This is a dangerous mold which needs immediate professional remediation and elimination of conditions which promote its growth and spread in the home.

Professional Mold Remediation

Although not all mold is dangerous, there are a lot of mold types that can be confused for the more dangerous types. Rather than guess or mistake the identity of a non-toxic mold for a more dangerous one, call the mold remediation professionals at RCS, proudly serving the Santa Rosa, Sonoma County and surrounding North Bay areas. The licensed mold remediation specialists at RCS can safely remove mold and put together a treatment plan to prevent it from returning to your home.

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