Mold Compass Free mold guidance and practical resources
Water leak cleanup and drying

After a Leak

What to do immediately after water intrusion to prevent mold.

Stop Water, Start Drying

Stop the source if possible, remove standing water, and begin drying immediately. The goal is to reduce moisture in materials before mold can establish.

First 24 Hours

  1. 1

    Shut off the source

    Stop the leak or shut off water if needed.

  2. 2

    Remove standing water

    If the water is clean and electrical and structural hazards have been ruled out, use towels, a suitable wet vacuum, or extraction equipment.

  1. 3

    Move contents

    Lift furniture and remove wet items for drying.

  2. 4

    Increase airflow

    Only after the water is known to be clean and sanitary and other hazards are ruled out, use fans and open windows if outdoor humidity is lower.

  3. 5

    Document damage

    Take photos and note dates for insurance or landlord documentation.

24 to 48 Hours

Drying Priorities

  • Remove wet carpet pad if saturated
  • Lift baseboards for airflow
  • Use dehumidifiers to pull moisture from the air
  • Check hidden spaces like under sinks and behind cabinets

Watch for Red Flags

  • Persistent damp smells after drying
  • Bubbling paint or swelling drywall
  • Moisture readings still high
  • Water in wall cavities or ceilings

After 48 Hours

  • Remove porous materials that are still wet
  • Inspect for hidden dampness and staining
  • Consider professional drying if materials remain wet
  • Monitor humidity levels to prevent re-wetting

When to Call a Pro

  • Large area or multiple rooms affected
  • Water came from sewage or outside flooding
  • Wet insulation or wall cavities

Official Resources