Different Colors of Mold Explained

Health Risks & Black Mold Dangers

Mold can appear in many different colors, and homeowners often assume that color alone determines how dangerous it is. In reality, mold is identified by species, not color. However, understanding the different colors of mold in a house can help homeowners recognize potential issues and health risks—especially when moisture problems go unaddressed.

Black mold is the most widely known and often the most concerning type of mold found indoors. While not all black molds are dangerous, Stachybotrys chartarum—commonly referred to as toxic black mold—has the highest health risk potential for humans. This mold typically grows on water-damaged drywall, wood, and paper products. Long-term exposure has been linked to respiratory problems, asthma flare-ups, chronic coughing, headaches, and fatigue.

Green mold is another common form of household mold and often includes species such as Aspergillus and Penicillium. These molds spread easily through the air and may negatively affect indoor air quality, triggering allergies, sinus irritation, and respiratory symptoms—especially in children, seniors, and individuals with compromised immune systems.

White or gray mold may appear less alarming, but it still indicates a moisture issue within the home. These molds are commonly found in basements, crawl spaces, and attics and can cause musty odors and allergy-like symptoms if left untreated.

Yellow, brown, or orange mold is less common but can still pose health concerns. These colors often appear in bathrooms, kitchens, or high-humidity areas. Some yellow molds can produce allergens or irritants and should be professionally evaluated.

Pink or purple mold-like growth is often bacterial rather than true mold, commonly found in showers and bathrooms. While not mold, it still signals excess moisture and potential sanitation concerns.

The Bottom Line

The mold with the highest health risk is Stachybotrys chartarum, a type of black mold associated with long-term water damage. That said, any mold growth inside a home should be taken seriously. Professional mold inspection and testing are the most reliable ways to identify mold types and protect your home and health.