Types of Mold Found in Homes
Black, white, green — and the species behind them. What each looks like, where it grows, and which warrant concern.
| Type | Look | Where | Concern |
|---|---|---|---|
| Stachybotrys (black mold) | Dark green/black, slimy | Wet drywall, wood | High |
| Aspergillus | Green/white/yellow | Walls, insulation, HVAC | Mod–high |
| Penicillium | Blue-green, fuzzy | Water-damaged materials | Moderate |
| Cladosporium | Olive to brown/black | Baths, fabrics, ducts | Moderate |
| Alternaria | Dark green/brown, velvety | Showers, sinks | Allergenic |
Color isn't the whole story
"Black mold" is a look, not a species — many dark molds are harmless and some dangerous ones aren't black. To be certain, a lab test settles it.
What they share
Every type needs moisture. Whatever the species, the fix is the same: safe removal plus eliminating the water source — our process.
FAQ
Types questions
Cladosporium, Aspergillus, Penicillium, Alternaria, and Stachybotrys (toxic black mold). They vary in color and risk.
Stachybotrys and some Aspergillus species are the larger health concerns, but any mold can set off allergy or respiratory symptoms and points to moisture.
Not reliably — color is a clue, not a verdict. Many species share colors; only lab testing confirms which one you have.
Loveland Mold Guides
More mold resources
Mold problem in Littleton? Let's solve it.
Free same-day inspection, IICRC-certified remediation, and we handle the insurance claim. Talk to a local Loveland specialist.