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How to Prevent Mold Growth After a Leak or Flood

Published on May 15, 2026 • By Joe Yerdon • Updated: May 15, 2026

Quick Answer

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The 48-Hour Window

Mold can begin to grow within 24 to 48 hours of water exposure. Acting quickly is essential to protect your home's structural integrity and your family's health.

1. Stop the Water Source

Whether it's a leaking pipe, a roof leak, or a broken appliance, your first priority must be stopping the water.

2. Remove Standing Water

Use a wet/dry vacuum, towels, or mops to extract as much liquid water as possible. Do not wait for it to air dry.

3. Maximize Ventilation and Drying

Open windows if the humidity outside is lower than inside. Use high-powered fans and dehumidifiers to circulate air and extract moisture from carpets, drywall, and wood framing.

4. Remove Soaked Materials

Carpets, carpet padding, and insulation that have been soaked in dirty water (or clean water for more than 48 hours) usually cannot be saved and must be discarded.

5. Professional Remediation

If the affected area is larger than 10 square feet, the EPA recommends hiring a professional mold remediation and home repair service to ensure safe and complete removal.

J

Joe Yerdon

Reviewed by Licensed Technician

Founder and Lead Technician at Smart Home Repair with over 15 years of experience in home improvement, electrical services, and smart home automation in Athens, GA.

Certifications: EPA Certified, Smart Home Installer, Fully Licensed & Insured in GA

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