The Myth: Many people assume mold always has a musty odor, but some mold species are odorless, meaning its presence isn’t always detectable by smell.

The Truth:
While a musty, earthy smell is a common indicator of mold growth, its absence does not guarantee that a space is mold-free. Some mold species do not produce strong odors, especially in their early stages. Additionally, mold growing behind walls, under flooring, or inside HVAC systems may not release enough airborne compounds to be easily detected by smell.

Since mold thrives in hidden areas, relying solely on odor to detect it can lead to a false sense of security. Signs like water stains, discoloration, peeling paint, or unexplained allergy symptoms can indicate a mold problem even if there’s no noticeable smell.

For those experiencing persistent health issues indoors—such as congestion, headaches, or respiratory irritation—without an obvious source, hidden mold should be considered. In such cases, a moisture inspection or professional assessment may be needed to uncover mold behind surfaces.

By understanding that mold doesn’t always smell, homeowners and occupants can stay proactive in identifying potential mold problems, focusing on moisture control and visual signs rather than relying solely on their sense of smell.