How Do You Prevent Mold After a Flooding Event?

Your first step is to eliminate the water source. Stop the flow by shutting off the main water valve if the flooding is from a plumbing failure. For external flooding, you may need to wait for the water to recede before safely entering. Then, remove as much standing water as you can using a wet-dry vacuum, pumps, or buckets. The longer water sits, the more it soaks into materials, creating a perfect environment for mold.

After water removal, the deep drying process begins. Use high-volume fans and industrial-grade dehumidifiers to pull moisture from the air and building materials. Move furniture away from walls and lift curtains off wet floors. Open cabinets and closet doors to promote airflow. Drying is not done when surfaces feel dry; it is done when moisture meters confirm the hidden moisture in walls and subfloors is gone.

• Place dehumidifiers in the center of the affected room.
• Use air movers to create a cross-flow of air across wet surfaces.
• Monitor the drying progress with a moisture meter you can buy or rent.
• Check for hidden moisture behind baseboards and under flooring.
• Run your home's air conditioning system to help lower humidity.
• Keep the area well-ventilated by opening windows if outdoor humidity is low.

Prevention continues after the cleanup. Watch for signs of returning moisture or new mold growth, like a musty odor or discoloration on walls. Indoor humidity can spike in certain climates, so keep dehumidifiers running if needed. If you or family members develop new respiratory issues, headaches, or allergy symptoms, see a doctor and consider having a mold professional inspect your home.

• Sniff for persistent musty odors in the cleaned area weeks later.
• Look for new water stains or warping on floors and walls.
• Watch for condensation on windows, which signals high indoor humidity.
• Be alert to increased allergy symptoms among household members.
• Consider a follow-up moisture inspection if you have any doubts.
• Keep gutters clean and ensure drainage slopes away from your foundation.