What Does Black Mold Look Like?
"Black mold" usually refers to Stachybotrys chartarum, but many dark molds look similar. Visual ID alone is unreliable — lab testing confirms species.
Typical Appearance
Dark green to black, often slimy or wet-looking on chronically damp drywall, ceiling tiles, or wood.
Common Locations
Around plumbing leaks, behind toilets, under sinks, in basements, and on water-damaged drywall.
What to Do
Avoid disturbing it, document with photos, and schedule a professional inspection and testing.
Frequently Asked Questions
More mold education
View allIf you've noticed a musty smell, persistent allergies, dark staining, or unexplained moisture in your El Cajon home, it may be time for a professional mold inspection. Here are the most common warning signs.
Indoor mold needs three things: moisture, an organic food source, and time. Understanding the conditions that support growth helps you prevent it.
Mold's health impact varies by species, exposure level, and individual sensitivity. For some people, indoor mold causes noticeable symptoms; for others, exposure may be minimal.
Mildew is a surface fungus that's usually easy to clean. Mold is broader category that can penetrate building materials and is harder to remove. Understanding the difference helps you respond appropriately.
Yes — mold often grows inside wall cavities where you can't see it. Hidden mold is common after plumbing leaks, roof leaks, or chronic condensation.
Mold can begin growing on wet building materials within 24–48 hours. After any water damage, fast assessment matters.
Concerned About Mold? Schedule a Professional Inspection Today.
Same-week appointments available throughout El Cajon and San Diego County.