What it is
Acremonium starts as a small moist colony and matures into a fine, powdery substance - usually pink, gray, orange, or white.
Where it grows
Damp areas in building systems: humidifiers, cooling coils, drain pans, window sealants, insulation. We find it most often in HVAC mechanical rooms.
Health impact
Rare infections in immunocompromised individuals. Most healthy adults will have minor allergic reactions if any.
This species does not typically produce mycotoxins, though it can still cause allergic reactions and respiratory irritation.
Property risk
Can colonize building systems and recirculate spores via HVAC. Slower-growing than the aggressive species but persistent if the moisture source isn't addressed.
When to test
If you see what looks like acremonium in your home - or if a lab report flagged it in your air samples - testing the affected area against an outdoor baseline is the most useful next step. The decision about remediation depends on:
- How much is present (spore count per cubic meter, or visible square footage)
- What's beneath it (porous materials like drywall and insulation usually need removal; hard surfaces can often be cleaned)
- Whether the moisture source is identifiable and fixable
Our approach
For confirmed indoor acremonium colonies, our process is the same as for any mold species: identify and stop the moisture source, contain the work area, remove what's compromised, HEPA-filter and HEPA-vacuum the surrounding area, dry everything, and verify with a post-remediation clearance test against the outdoor baseline.