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Diseases and Pathogens in Flood Water: What You're Exposed To

Last updated October 25, 2026

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The short answer

What Pathogens Lurk in Flood Water

Flood water can contain a wide range of pathogens, including bacteria like E. Coli and Salmonella, viruses such as hepatitis A and norovirus, and parasites like Giardia and Cryptosporidium. These microbes often come from overflowing sewers, agricultural runoff, and animal waste that mix into the water.

Mold spores and other allergens can also be present, especially if the water sits for days. The longer flood water remains, the higher the risk of microbial growth. You cannot tell by sight or smell which pathogens are present, so assume the water is contaminated until a professional assesses the situation.

  • Bacteria: E. Coli, Salmonella, Shigella
  • Viruses: norovirus, hepatitis A
  • Parasites: Giardia, Cryptosporidium
  • Mold spores and fungi
  • Chemical contaminants from runoff

How You Can Get Sick

You can get sick through direct skin contact, by ingesting contaminated water, or by breathing in droplets or dust from dried flood residue. Open wounds or scratches make infection easier. Even a small splash near your mouth or eyes can expose you to pathogens.

Symptoms of waterborne illness include nausea, vomiting, diarrhea, fever, and skin rashes. Respiratory problems can occur if mold or contaminated dust is inhaled. If you feel unwell after contact with flood water, see a doctor and mention the exposure.

Protect Yourself During Cleanup

Before you start any cleanup, put on rubber boots, waterproof gloves, and a mask that covers your nose and mouth. Wear long sleeves and pants to minimize skin contact. Wash any exposed skin with soap and clean water as soon as possible.

Do not turn on the power in a flooded area until an electrician has checked it. Keep children and pets away from flood water and affected items. If you have a compromised immune system, consider having a professional handle the cleanup entirely.

  • Use rubber boots and waterproof gloves
  • Wear an N95 mask or better
  • Wash skin immediately after contact
  • Keep children and pets out of affected areas
  • Assume all water is contaminated

When to Call Local Water Damage Pros

If flood water has entered your home, especially from outside or from sewage backup, the cleanup is more than a mop job. Porous materials like drywall, carpet, and insulation can harbor pathogens and mold. Drying the area quickly is critical, but you need to do it safely.

Local water damage pros have the equipment to extract water, dry structures, and remove contaminated materials properly. They can also help prevent cross-contamination within your home. If the flooding is extensive, calling them early can reduce health risks and property damage.

Disinfecting and Restoring Your Home

After water is removed, surfaces that can be saved need thorough cleaning. Use a disinfectant approved for flood cleanup, and follow the label instructions. Hard surfaces like concrete and metal can often be cleaned and reused, but porous items may need to be discarded.

Your insurance company may cover some costs, but policies vary, and your insurer decides what is covered. Check your policy and document all damage with photos. If you have questions about coverage, ask your insurer directly. For the actual cleanup, consider services like flood damage cleanup and water damage inspection to ensure the job is done thoroughly.

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Frequently asked questions

Can I get sick from just touching flood water?

Yes, touching flood water can expose you to pathogens through your skin, especially if you have cuts or scrapes. Wash the area with soap and clean water immediately. If you develop redness, swelling, or fever, see a doctor.

How long does flood water stay dangerous?

Flood water remains dangerous until it is fully removed and surfaces are properly cleaned and dried. Pathogens can survive on surfaces for days or weeks. Even after water is gone, dried residue can become airborne, so wear a mask during cleanup.

Should I throw away items that touched flood water?

Porous items like carpets, mattresses, upholstered furniture, and drywall usually need to be discarded because they cannot be fully disinfected. Non-porous items like glass, metal, and hard plastic can often be cleaned and kept. When in doubt, throw it out.

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