The Most Common Types of Mold in Your Home

Finding mold growth somewhere in the house is every homeowner’s worst nightmare. The presence of mold can lead to health problems for the entire family, including pets, and can wreak havoc on the home itself. Looking for and identifying mold as soon as you can is essential in getting it removed before it becomes a health and safety hazard. If you’re unsure what to look out for, keep reading for a list of the most common types of mold in your home.

Classifications of Mold

Mold in the home can undoubtedly be harmful to humans. The ways in which these present danger can be divided up into three main categories:

  • Allergenic. Allergenic molds are those that prompt allergic reactions in people or pets nearby. Reactions can include coughing, sneezing, runny nose, watery eyes, and even asthma attacks.
  • Pathogenic. This type of mold can cause a specific acute disease to occur in residents, much like the way a virus works.
  • Toxigenic. Molds that are toxigenic are ones that produce a toxic substance harmful to other organisms. Many toxins released by various molds have been found to be carcinogenic.

Types of Mold

There are thousands of mold species that grow all around the world, but there are a few that make a habit of showing up in human households. Here are the main offenders you should be wary of:


There are nearly 200 species included in the Aspergillus group of molds, and they’ve all been identified in American homes.  And unfortunately, it’s a dangerous one to have in the house since it falls under all three classifications. It produces allergic reactions, can cause disease in immunocompromised people, and produces carcinogenic toxins.


This mold is a dangerous toxigenic mold that loves a cool, damp area. It can often be found spreading around humidifiers, window sealants, and humidifiers. It is noticeable by its pink, grey, or orangey tones. Acremonium is a known producer of carcinogens that attack the immune system, bone marrow, and internal organs.


Stachybotrys is the infamous black mold that can mean a death sentence to a house on the market. Like every mold, it loves a highly humid environment and makes meals of cardboard, paper, wood, and wicker. It often produces allergic reactions but has also been discovered to be a toxigenic mold as well. Symptoms of exposure to its toxins include fatigue, sinusitis, breathing difficulties, headaches, and nose bleeds.


A less harmful mold, Trichoderma is an allergenic mold that grows inside the home on wet surfaces. It can sometimes be found under carpets or wallpaper if there is an unidentified leak nearby. It consumes wood, so catching it early on is crucial in preserving structural integrity.


Yes, penicillin is the main ingredient in a traditional antibiotic, but its spores aren’t meant to be inhaled. This allergenic mold can cause serious pulmonary inflammation and difficulty breathing if left to spread indoors. Penicillin often grows in water-damaged homes near carpets, mattresses, and ducting. Its spores spread quickly, so stopping this blue mold, at first sight, is essential. Several other types of mold can be found inside the home, but knowing the five most common types will help you get on the right foot for identifying mold in your home.

Contact Us For Mold & Germ Remediation Services

On discovering the presence of mold, it is usually important to call the facilities engineers or experts to get a professional opinion to solve the issue surrounding the mold in your home.

If you see mold or suspect that mold is growing in your home, mold remediation should be applied to ensure that your home or business is free of mold or toxins.  Reach out to us today for a free quote or call us directly at (508) 534–9091. We are proud to serve Yarmouth, Dennis, Barnstable, and the rest of Cape Cod & South Shore Area.

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