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What Diseases Can You Get From Flood Water in Your Home?

Last updated October 25, 2026

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The short answer

Common Gastrointestinal Infections

Flood water often carries sewage and agricultural runoff, introducing harmful bacteria like E. Coli and Salmonella, and viruses like norovirus. Ingesting even a tiny amount of contaminated water can lead to severe stomach cramps, vomiting, and diarrhea. These illnesses can be particularly dangerous for children, the elderly, or anyone with a compromised immune system. Always assume flood water is unsafe to drink or touch your face after contact.

The risk persists even after water recedes, as contaminants dry on surfaces. Thorough cleaning and disinfection of every affected item and area are necessary to prevent ongoing exposure. This is not a standard cleaning job and requires specific protocols. Local water damage pros are equipped to safely handle contaminated water cleanup and disinfection.

Skin and Wound Infections

Bacteria such as Staphylococcus and Streptococcus thrive in flood water. If you have any cuts, scrapes, or even minor insect bites, these pathogens can enter and cause serious infections like cellulitis. The initial signs include redness, swelling, warmth, and pain around the wound. If an infection develops, you should see a doctor for appropriate treatment.

It is vital to wear waterproof boots, gloves, and protective clothing if you must enter a flooded area. Cover any existing wounds with waterproof bandages before starting any cleanup. If flood water contacts a wound, wash it immediately with soap and clean water and monitor it closely. Seek medical attention at the first sign of infection.

Respiratory Issues from Mold

Mold begins growing on wet drywall, carpets, and wood within 24 to 48 hours. In Melbourne's humid subtropical climate with hot rainy summers and an Atlantic hurricane season, this process accelerates. Inhaling mold spores can cause allergic reactions, asthma attacks, coughing, and wheezing. Some individuals may experience more severe reactions, especially with prolonged exposure.

Removing the water quickly is only the first step. Drying the structure completely and removing moldy materials are specialized tasks. Inhaling disturbed mold during DIY cleanup can worsen the problem. Professional assessment and drying are key to preventing these mold-related health hazards from taking hold in your home.

Vector-Borne and Other Diseases

Standing flood water creates breeding grounds for mosquitoes, which can transmit diseases like West Nile virus. While less common, flood water can also spread parasites like Giardia, causing intestinal illness, and bacteria that lead to leptospirosis. Leptospirosis enters the body through cuts or mucous membranes and causes flu-like symptoms that can escalate to liver or kidney damage.

After a flood, eliminating standing water around your property is a public health measure. For water inside, specialized extraction and drying equipment is needed to remove every trace of moisture. This disrupts the cycle that allows pests and pathogens to multiply. The pros follow strict procedures for contaminated water to address these specific biological risks.

Immediate Protective Steps

Your safety is the priority. Avoid contact with flood water whenever possible. If you must wade through it, wear rubber boots, nitrile or rubber gloves, and safety goggles. Wash your hands thoroughly with soap and clean water after any contact, and before eating or drinking. Change out of contaminated clothing as soon as you are done.

Do not attempt to clean extensive flood damage yourself. The water is classified as black water, which is grossly contaminated. Professional flood damage cleanup involves industrial-grade extraction, antimicrobial treatments, and controlled demolition of unsalvageable materials. This process is designed to remove the health hazards, not just the visible water.

  • Assume all flood water is contaminated with sewage, chemicals, or debris.
  • Keep children and pets completely away from flooded areas and standing water.
  • Turn off electricity at the main breaker before entering a flooded area to prevent electrocution.
  • Discard any food, medicines, or cosmetics that came into contact with flood water.
  • Ventilate the area by opening windows and doors if it is safe to do so.
  • Document the damage with photographs for your insurance company before cleanup begins.

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Frequently asked questions

How soon after contact with flood water do symptoms appear?

Symptoms vary by illness. Gastrointestinal issues from bacteria may appear within hours to a few days. Wound infections can develop within 24 hours. Mold-related respiratory symptoms may begin immediately or after repeated exposure. See a doctor if you develop any symptoms after contact with flood water.

Can my home be safe again after a flood?

Yes, with proper professional remediation. The process involves removing all contaminated water, thoroughly drying the structure, cleaning and disinfecting salvageable items, and disposing of porous materials like drywall and insulation that cannot be cleaned. This returns your home to a dry, clean, and safe condition.

Does insurance cover disease prevention cleanup?

Many homeowners policies cover water damage restoration, which includes the cleanup necessary to remove health hazards. However, coverage depends on the source of the flood. Policies vary, and your insurer decides what is covered. Check your policy and report the damage to your insurance company.

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