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Guides

Mold in a damp house

Get wet materials dry within 24 to 48 hours to prevent mold growth, and keep indoor humidity below 60 percent, ideally 30 to 50.1 If the moldy area is bigger than about 10 square feet, the EPA points to its guidance for larger jobs.2

Last reviewed October 24, 20263 sources, numbered in the textSee sources

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The clock

Two days to get it dry

0 h24 h48 h24–48hours to get it dry
  1. NowStop the water. Make it safe. Take photos.
  2. Day oneStanding water out; fans and a dehumidifier running.
  3. 24 to 48 hoursThe EPA's window for drying wet areas and items.1
  4. Closed up for daysThe CDC says to assume mold if a flooded house was shut for several days.3

  • Condensation on windows can be a sign of high humidity.1

  • Vent clothes dryers and stoves to the outside where possible.1

  • Moldy porous things such as carpet or ceiling tiles may have to go.2

  • Fix where the water came from, or the mold is likely to return.1

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Sources

Each numbered note on this page points here. We read every page on October 24, 2026. Where sources disagree we say so; where we could not find a source we left the claim out. We are not affiliated with any of these organizations.

  1. U.S. EPA, A Brief Guide to Mold, Moisture and Your Home. Page updated February 18, 2026. www.epa.gov/mold/brief-guide-mold-moisture-and-your-home
  2. U.S. EPA, Mold Cleanup in Your Home. No date shown. www.epa.gov/mold/mold-cleanup-your-home
  3. CDC, Safety Guidelines: Reentering Your Flooded Home. Page updated August 24, 2026. www.cdc.gov/floods/safety/reentering-your-flooded-home-safety.html
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