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What Are the Health Risks of Flood Water Exposure?

Last updated October 25, 2026

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The short answer

What Is in Flood Water

Flood water is rarely clean. It can carry raw sewage, agricultural runoff, gasoline, and industrial chemicals. In urban areas like Detroit, storm drains can overflow and mix with street waste. Even in a flooded basement, the water may contain bacteria from soil and animal waste.

The exact contents depend on what the water touched before it reached your home. A nearby river or lake can add sediment and parasites. A sewer backup adds a different set of germs. You cannot tell by looking, so treat all flood water as contaminated.

Short Term Health Effects

Direct skin contact can cause rashes, itching, and infections, especially if you have cuts or scrapes. Swallowing even a small amount of contaminated water can lead to nausea, diarrhea, or stomach cramps. Symptoms may appear within hours or a few days.

Open wounds are a serious concern. Bacteria like E. Coli and staph can enter through broken skin and cause deep infections. If you get a cut while cleaning, wash it with soap and clean water and cover it. See a doctor if redness, swelling, or pain develops.

  • Skin rashes and itching
  • Stomach illness from accidental swallowing
  • Infections in cuts or scrapes
  • Eye, ear, or nose irritation
  • Headache or dizziness from chemical fumes

Long Term Mold Risks

After the water recedes, mold can grow on damp surfaces within 24 to 48 hours. Mold spores become airborne and can trigger allergic reactions, asthma attacks, and respiratory problems. People with weakened immune systems or chronic lung conditions face higher risks.

Mold exposure can cause coughing, wheezing, and nasal congestion. In some cases, prolonged exposure leads to more serious respiratory illness. Drying out your home quickly is important. If you see or smell mold, a mold professional can assess the situation and advise on safe removal.

Protecting Yourself During Cleanup

Wear rubber boots, gloves, and a mask that covers your nose and mouth. Keep children and pets away from flooded areas. Do not eat or drink anything that came into contact with flood water. Wash your hands thoroughly with soap and clean water after any cleanup work.

If you have an open wound, cover it with a waterproof bandage before entering the area. Work in short sessions and take breaks in fresh air. If you feel dizzy, nauseous, or short of breath, stop and get to clean air. Seek medical care if symptoms persist.

  • Rubber boots and waterproof gloves
  • N95 mask or better for dusty moldy areas
  • Eye protection to keep splashes out
  • Long sleeves and pants to cover skin
  • Clean water and soap for handwashing

When to Call for Help

Flood water cleanup often involves more than removing standing water. Wet drywall, carpet, and padding can hold moisture and harbor bacteria. If the flooding is extensive or you have health concerns, local water damage pros can handle extraction, drying, and disposal of damaged materials.

The pros have equipment to remove water quickly and dry out structures. They also know how to handle contaminated debris safely. For a flooded basement, a service like flooded basement cleanup can be a practical option. If you live in Detroit, write down a few local contact numbers before the next storm.

If you are unsure whether your home is safe to enter, wait until the water recedes and the area is dry. Do not wade into moving water. If you have any doubt about your health, see a doctor.

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Frequently asked questions

Can I get sick from just touching flood water?

Yes, touching contaminated water can cause skin irritation and infections, especially if you have cuts. Wash any exposed skin with soap and clean water as soon as possible. If a wound gets red or painful, see a doctor.

How soon can mold start after a flood?

Mold can begin growing within 24 to 48 hours on wet surfaces. Drying out your home quickly reduces the chance of mold. If mold appears, a mold professional can help determine the right way to remove it safely.

Should I worry about my drinking water after a flood?

If your well or municipal water system has been flooded, you should not drink the water until it is tested. Boiling water kills some germs but not chemicals. Check with your local health department for guidance.

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