Reentering Your Flooded Home

When returning to a home that’s been flooded after natural disasters such as hurricanes, tornadoes, and floods, be aware that your house may be contaminated with mold or sewage, which can cause health risks for your family.

When You First Reenter Your Home

• If you have standing water in your home and can turn off the main power from 
  a dry location, then go ahead and turn off the power, even if it delays cleaning.
  If you must enter standing water to access the main power switch, then call an
  electrician to turn it off. NEVER turn power on or off yourself or use an
  electric tool or appliance while standing in water.
• Have an electrician check the house’s electrical system before turning the power
  on again.
• If the house has been closed up for several days, enter briefly to open doors
  and windows to let the house air out for awhile (at least 30 minutes) before you
  stay for any length of time.
• If your home has been flooded and has been closed up for several days,
  presume your home has been contaminated with mold. (See Protect Yourself
  from Mold.)
• If your home has been flooded, it also may be contaminated with sewage.
  (See After a Hurricane or Flood: Cleanup of Flood Water.)

Dry Out Your House

If flood or storm water has entered your home, dry it out as soon as possible. Follow these steps:

• If you have electricity and an electrician has determined that it’s safe to turn it on,
  use a “wet-dry” shop vacuum (or the vacuum function of a carpet steam cleaner),
  an electric-powered water transfer pump, or sump pump to remove standing water.
  If you are operating equipment in wet areas, be sure to wear rubber boots.
• If you do not have electricity, or it is not safe to turn it on, you can use a portable
  generator to power equipment to remove standing water. Note: If you must use
  a gasoline-powered pump, generator, pressure washer, or any other gasoline-
  powered tools to clean your home, never operate the gasoline engine inside
  a home, basement, garage, carport, porch, or other enclosed or partially
  enclosed structures, even if the windows and doors are open. Such improper
  use can create dangerously high levels of carbon monoxide and cause carbon
  monoxide poisoning.
• If weather permits, open windows and doors of the house to aid in the drying-out
  process.
• Use fans and dehumidifiers to remove excess moisture. Fans should be placed
  at a window or door to blow the air outwards rather than inwards, so not to spread
  the mold.
• Have your home heating, ventilating, and air-conditioning (HVAC) system checked
  and cleaned by a maintenance or service professional who is experienced in mold
  clean-up before you turn it on. If the HVAC system was flooded with water, turning
  on the mold-contaminated HVAC will spread mold throughout the house. Professional
  cleaning will kill the mold and prevent later mold growth. When the service determines
  that your system is clean and if it is safe to do so, you can turn it on and use it to help
  remove excess moisture from your home.
• Prevent water outdoors from reentering your home. For example, rain water from
  gutters or the roof should drain away from the house; the ground around the house
  should slope away from the house to keep basements and crawl spaces dry.
• Ensure that crawl spaces in basements have proper drainage to limit water seepage.
  Ventilate to allow the area to dry out.

Source: Centers for Disease Control and Prevention (CDC)
Last Modified: 2005