Is It Mold or Just Dirt? 5 Signs You Shouldn’t Ignore

It’s easy to write off that dark patch in the corner of your basement or bathroom as "just dirt." But ignoring it could be a costly mistake. Mold and mildew often blend in with everyday grime, but they pose very different risks to your home and health.

Here are five signs that you may be dealing with mold — not just dirt:

1. It Has a Musty Smell: Even before you see it, mold usually gives itself away with an earthy, musty odor. If you notice a persistent smell, especially in damp areas like basements, attics, or bathrooms, that’s a red flag.

2. The Spot Keeps Coming Back: You clean it, it disappears, but a week later it’s back? That’s a strong sign you’re not dealing with surface dirt but an underlying mold problem that needs remediation.

3. Discoloration Is Spreading: Unlike dirt, mold tends to grow over time. If you notice a dark patch getting larger, especially with fuzzy or slimy textures, it's time to call a professional.

4. People in Your Home Feel Sick: Mold exposure can cause allergy-like symptoms, especially in children, the elderly, or people with asthma. If someone in your household has unexplained coughing, congestion, or headaches, mold may be the culprit.

5. It Appears After Water Damage: If the staining showed up after a leak, flood, or burst pipe, there’s a good chance it's mold. Moisture is mold's best friend.

Still Not Sure?

Our team at MacLean Environmental can test and identify mold quickly and safely. Don’t guess when it comes to your health — call us to schedule a mold inspection.