Mold Testing and Remediation: Home Guide

Mold can affect health. Here’s how to test for it and what to do if found.

For all environment guides, see: Best Air Purifiers for Home.

When to Suspect Mold

• Musty smell
• Visible growth (black, green, white spots)
• Recent water damage/flooding
• Persistent respiratory symptoms at home
• High humidity (>60%)

Types of Mold Tests

Type	Method	Cost
Air sampling	Professional captures air samples	$200-500
Surface sampling	Swabs or tape lifts	$50-150
DIY test kits	Petri dishes capture spores	$10-50
ERMI test	Dust sample DNA analysis	$200-400

DIY vs Professional Testing

DIY Kits	Professional Testing
Inexpensive	More accurate
Can give false positives	Identifies species and counts
Good for initial screening	Required for real estate/legal

ERMI Testing

Environmental Relative Moldiness Index:

• Analyzes dust sample for mold DNA
• Compares to national database
• Score indicates relative moldiness
• Good for “big picture” assessment

When to Call Professionals

• Mold covers >10 square feet
• In HVAC system
• After significant water damage
• Health symptoms suspected mold-related
• For real estate transactions

DIY Remediation (Small Areas)

For small areas (<10 sq ft):

1. Wear N95 mask, gloves, goggles
2. Isolate area (close doors, plastic sheeting)
3. Clean hard surfaces with detergent solution
4. Dry completely
5. HEPA vacuum the area
6. Fix moisture source

Prevention

• Humidity: Keep below 50%
• Ventilation: Bathroom/kitchen fans
• Address leaks: Fix promptly
• Dehumidifier: In damp areas

Air Purifiers for Mold

HEPA purifiers can help remove mold spores from air, but don’t address the source. Use as supplement to remediation,
not replacement.

Verdict

If you suspect mold: Start with visual inspection and DIY test kit.

For significant issues: Hire professional tester and remediator.

Prevention: Control humidity and fix moisture sources promptly.

For all environment guides, see: Best Air Purifiers for Home.