Phone answered 24/7 · Mesa, AZ and nearby communities

Call 24/7: (480) 898-4279
Usery Mountain Water Damage HelpMesa, AZ · Answered 24/7

What's in Floodwater That Can Make You Sick?

Last updated October 31, 2026

Call Now (480) 898-4279

The short answer

Bacteria and Viruses

Floodwater often picks up sewage and animal waste as it moves. That means it can carry bacteria like E. Coli, salmonella, and campylobacter. Viruses such as hepatitis A and norovirus can also survive in floodwater. These pathogens can cause diarrhea, vomiting, or fever if you swallow contaminated water.

Skin contact is a risk too. Bacteria can enter through cuts or scrapes, leading to infections. If you have an open wound, keep it covered and avoid floodwater. If you feel unwell after exposure, see a doctor promptly. Clean and disinfect any items that touched floodwater before using them again.

  • E. Coli and salmonella from sewage
  • Hepatitis A and norovirus from contaminated water
  • Infections through cuts or scrapes
  • Stomach cramps, diarrhea, or fever
  • Always wash hands after any contact

Parasites and Protozoa

Parasites like giardia and cryptosporidium are common in floodwater. These microscopic organisms can cause severe stomach upset. They are resistant to chlorine, so standard water treatment may not kill them. You can get infected by drinking floodwater or even by swallowing a small amount while swimming or cleaning.

Symptoms of parasite infections include nausea, cramps, and prolonged diarrhea. If you suspect you have been exposed, see a doctor. Boil any water you use for drinking or cooking if it may be contaminated. Do not rely on water filters alone, as they may not remove these parasites.

Chemicals and Toxins

Floodwater can wash in chemicals from roads, lawns, and industrial sites. This includes oil, gasoline, pesticides, and cleaning products. These substances can cause skin irritation, breathing problems, or poisoning if ingested. Never use floodwater for drinking, cooking, or bathing.

Contaminated soil and standing water can hold these chemicals for a long time. If your home has flooded, remove any items that absorbed floodwater. Dispose of them properly. If you have a well, have the water tested before using it again. Check with local health officials for guidance on safe water use.

Debris and Physical Hazards

Floodwater hides sharp objects, broken glass, metal, and wood. Stepping into it can cause cuts or punctures, which become infected easily. It can also hide downed power lines, creating a risk of electrocution. Always wear boots and gloves if you must walk through floodwater.

Heavy debris can cause injuries if you try to move it. Do not wade through moving water, as it can knock you off your feet. If you see a downed power line, stay away and report it to the power company. Protect yourself with sturdy clothing and avoid any unnecessary contact.

Mold and Allergens

After floodwater recedes, mold can grow on wet surfaces within days. Mold spores can trigger allergies, asthma, and respiratory infections. People with weakened immune systems are especially at risk. Drying out your home quickly helps reduce mold growth, but you should still treat any affected areas with care.

If you have respiratory symptoms like coughing or wheezing, leave the area and see a doctor. Wear an N95 mask and gloves when cleaning mold. Remove wet carpets and drywall that cannot be dried. For extensive mold, consider contacting a mold professional. In Mesa, local water damage pros can help with cleanup.

Water damage does not wait

Phones are answered 24/7 for Mesa and nearby communities.

Call Now (480) 898-4279

Frequently asked questions

How long does floodwater stay dangerous?

Floodwater can remain contaminated for days or weeks, depending on the source and conditions. Even after water recedes, bacteria and chemicals can stay in soil and on surfaces. Always treat anything touched by floodwater as contaminated until it is properly cleaned or discarded.

Can I clean up floodwater myself?

Small, contained spills may be manageable, but large floods pose serious health risks. You should avoid direct contact and wear protective gear. For extensive contamination, local water damage pros have the equipment and training to handle it safely. Your safety comes first.

What should I do if I get sick after floodwater exposure?

If you experience symptoms like diarrhea, vomiting, fever, or skin infections, see a doctor right away. Tell them about your exposure to floodwater. Keep hydrated if you have stomach issues. Do not ignore symptoms, as some infections can be serious.

Call Now (480) 898-4279