Mold typically emits a musty, earthy odor that is often described as damp or stale. The smell of
mold in walls can vary depending on factors such as the type of mold, the extent of the mold 
growth, and the conditions in which it is growing. However, common descriptors for the smell of 
mold in walls include: 
Musty: The most common description of the smell of mold is “musty.” It’s often likened to the 
smell of damp or wet soil. 
Earthy: Mold can sometimes have an earthy odor, similar to decaying organic matter or rotting 
Stale: Mold can give off a stale odor, similar to the smell of old books or a damp basement. 
Pungent: In some cases, mold may emit a stronger, more pungent odor that is unpleasant and 
Foul or Sour: Mold-infested walls may also emit a foul or sour odor, especially if the mold 
growth is extensive or if there are other organic materials present. 
It’s important to note that not all molds produce a noticeable odor, and some individuals may 
be more sensitive to mold odors than others. Additionally, the smell of mold in walls may be 
more pronounced in areas with poor ventilation or high humidity levels. 
If you detect a musty or unpleasant odor coming from your walls, it’s essential to investigate 
further to determine if mold is present. Conduct a visual inspection of the walls and 
surrounding areas for any signs of mold growth, water damage, or moisture issues. If you 
suspect mold but cannot locate the source, consider hiring a certified mold inspector to conduct 
a thorough assessment of your home. Early detection using a certified mold inspector and 
remediation of mold problems are essential for maintaining a healthy indoor environment. 
Unsure where to turn next? Give Austin Mold Testing a call to schedule a mold assessment as 
soon as possible.