The Most Common Types Of Mold Found In Chicago Homes

Mold is a common problem in many homes, especially in places with the right conditions for growth. Chicago homes are often at risk for mold due to humid summers and cold, wet winters. Knowing the most common types of mold in a house is crucial for Chicago homeowners, as it helps with effective prevention and remediation. 

Mold Removal in Chicago, Illinois

Black Mold (Stachybotrys Chartarum)

The most notorious type of mold is black mold, or more accurately, Stachybotrys Chartarum. This mold develops in areas exposed to moisture for an extended period, such as bathrooms, basements, and places that experience water leaks. Mold can produce substances called mycotoxins that are harmful to human health. Symptoms of exposure can include coughing, skin rashes, and feelings of fatigue. Older homes in Chicago may be more prone to leaks and humidity, therefore conducive to black mold growth. Regularly inspected and prompt repairs of water leaks are crucial in preventing its growth.


Aspergillus is another common mold found in the homes of Chicago. Aspergillus grows on various surfaces, including walls, ceilings, and insulation, and it often grows in damp or otherwise water-damaged areas. Aspergillus spores can cause allergic reactions or respiratory problems in some people and are particularly dangerous for those with compromised immune systems. Aspergillus can quickly spread in the relatively humid Chicago summers if left unattended. Keeping humidity levels low and ensuring proper ventilation in areas such as the kitchen and bathroom can help prevent its proliferation.


Cladosporium is a mold that can grow inside and outside the home and is particularly common in Chicago homes. It can grow on wood, carpets, and any other fabric. It is most common in semi-humid conditions and typically in basements and bathrooms. Cladosporium can cause allergies and respiratory illnesses, and long-term exposure can worsen the symptoms of asthma. The changing and fluctuating weather in Chicago can make the presence of Cladosporium challenging to prevent. Chicago homeowners can help prevent this mold by regular cleaning and using a dehumidifier.


Penicillium grows quickly and appears frequently on water-damaged paper products such as wallpaper, carpeting, and insulation. It can cause an intense musty odor, allergic symptoms, and, in some cases, breathing problems. Penicillium can quickly become a problem in Chicago homes with water intrusion from heavy and frequent rains or plumbing issues. Addressing water damage promptly and maintaining dry, well-ventilated spaces can prevent its spread.


Alternaria is a widespread fungus that thrives indoors as well as outdoors. It often grows on wet surfaces such as showers, under sinks, and window frames. Alternaria spores can cause allergic reactions and trigger asthma symptoms. Alternaria quickly finds its way into a house in Chicago’s hot, humid summers during downpours. Keeping moisture-prone areas clean and swiftly repairing leaks will help prevent this.

Understanding the most common types of mold found in Chicago homes is crucial in effective mold management. Every kind of mold presents unique challenges and health risks, making early detection and prevention critical. Homeowners can protect their homes from these common molds by maintaining low humidity levels, ensuring proper ventilation, and addressing water damage promptly. If you find mold in your home, call us at A-1 Restoration, Inc. as soon as possible. Our team of mold removal professionals will safely and successfully identify and remove these common molds from your Chicago home and restore it to a healthy living environment.