What Is Cryptosporidium Risk From Floodwater?

Floodwater picks up everything in its path, including animal waste, sewage, and soil. Cryptosporidium oocysts, the hardy form of the parasite, can survive for months in wet environments. When floodwater enters your home, it can leave these oocysts on floors, walls, and personal items.

The parasite is not visible to the naked eye, so you cannot tell if water is contaminated by looking at it. Even clear-looking floodwater may carry the risk. In flood-prone areas with heavy rain and hurricane season, flooding can happen often, so you should treat any floodwater as potentially contaminated.

• Do not wade in floodwater without waterproof boots and gloves
• Keep children and pets away from flooded areas
• Wash your hands with soap and clean water after any contact
• If you have open cuts, cover them with waterproof bandages
• Boil water before drinking if your local water supply may be affected
• See a doctor if you develop diarrhea, nausea, or fever after exposure

Cleaning up after a flood requires caution because Cryptosporidium oocysts are resistant to many common disinfectants, including chlorine bleach. You need to remove all mud and debris first, then clean surfaces with soap and water, and finally apply a disinfectant that is effective against the parasite, such as hydrogen peroxide or a product labeled for cryptosporidium.

Throw away porous items like carpets, upholstered furniture, and mattresses that got soaked, as they cannot be fully cleaned. Hard surfaces like tile, concrete, and metal can be cleaned and disinfected. Wear gloves, a mask, and protective eyewear during cleanup to avoid inhaling dust or touching contaminated material.

• Remove standing water with a pump or wet vacuum
• Discard any food that touched floodwater
• Clean hard surfaces with hot, soapy water first
• Use a disinfectant proven to kill Cryptosporidium
• Dry affected areas thoroughly within 24 to 48 hours
• Wash all clothing and linens in hot water with detergent

To reduce the risk of Cryptosporidium and other contaminants, you can take steps to minimize flood damage. Keep your gutters clean and ensure that drainage around your home directs water away from the foundation. If flooding is a concern in your area, consider installing flood barriers or elevating appliances.

Store important documents and valuables in waterproof containers, and elevate electrical outlets and appliances in flood-prone areas. After any flood, have your water supply tested if you use a private well. Policies vary, and your insurer decides what is covered, so check your policy to understand what flood damage protection you have.