How common is mold, including Stachybotrys chartarum in buildings?

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Molds are very common in buildings and homes and will grow anywhere indoors where there is moisture. The most common indoors molds are Cladosporium, Penicillium, Aspergillus and Alternaria. We do not have precise information about how often Stachybotrys chartarum is found in buildings and homes. While it is less common than other mold species, it is not rare.