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Sewage Backup Health Hazards: Why It's a Biohazard

Last updated October 25, 2026

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The short answer

What Makes Sewage a Biohazard

Raw sewage carries disease-causing organisms like E. Coli, hepatitis, and salmonella. These pathogens can survive on surfaces for days or weeks. Contact with contaminated water or items can lead to gastrointestinal illness, skin infections, or respiratory problems. Children and pets are especially vulnerable because they may touch contaminated areas and then their mouths.

Sewage also contains chemical residues and toxins from household cleaners and industrial waste. These can cause skin irritation, breathing issues, or long-term health effects. The combination of biological and chemical hazards is why sewage is classified as a biohazard. Treating it like ordinary water damage is unsafe and can put your health at risk.

Health Risks You Should Know

Common symptoms from sewage exposure include nausea, vomiting, diarrhea, fever, and skin rashes. Breathing in airborne particles from dried sewage can trigger coughing or worsen asthma. If you have open wounds, infection risk increases. See a doctor if you feel unwell after exposure. Do not attempt to clean sewage yourself.

The longer sewage sits, the more dangerous it becomes. Bacteria multiply rapidly in warm, damp conditions. Mold can also begin growing within 24 to 48 hours, adding respiratory hazards. Acting quickly to remove contaminated materials and dry the area reduces health risks. But proper protection and disposal methods are critical.

  • Never enter a flooded area without protective gear
  • Keep children and pets away from contaminated zones
  • Wash hands thoroughly with soap and clean water after any contact
  • Discard items that cannot be safely disinfected, such as stuffed toys or mattresses
  • Ventilate the area with open windows and fans if safe to do so

Why Professional Cleanup Matters

Local water damage pros have the training and equipment to handle biohazards safely. They use personal protective gear, industrial-grade disinfectants, and proper disposal methods. They can also identify hidden contamination in walls, subfloors, and HVAC systems. Attempting cleanup without this expertise can spread contamination further.

Professional cleanup involves removing contaminated materials, cleaning and disinfecting surfaces, and drying the structure thoroughly. They also address odors at the source, not just mask them. This process reduces health risks and helps prevent mold growth. The pros follow safety protocols that protect your home and your family.

If you live in Mesquite, keep your shutoff valve location written down and know how to stop a sewage backup quickly. After an incident, do not enter the area until it has been assessed. A professional can determine the extent of contamination and the safest course of action. Acting quickly is important, but safety comes first.

Steps to Protect Your Family

After a sewage backup, evacuate the affected area and shut off the water source if possible. Avoid touching anything that has been contaminated. Open windows for ventilation if it is safe, but do not use fans that could spread airborne particles. Wash your hands thoroughly if you have had any contact.

Document the damage with photos for your insurance records. Your insurance company will need details about the extent of the backup. Policies vary, and your insurer decides what is covered. Check your policy to understand what is included. Do not throw away items until you have documented them and consulted with your insurer.

  • Wear rubber gloves, boots, and a mask if you must be near the area
  • Remove any standing water with a mop or towels, but do not use household vacuum cleaners
  • Discard porous materials that cannot be washed, such as carpet and drywall
  • Wash all clothing and linens in hot water with disinfectant
  • Disinfect hard surfaces with a bleach solution (1 part bleach to 10 parts water)
  • Seek medical attention if you experience any symptoms

Preventing Future Sewage Backups

To reduce the risk of sewage backups, avoid flushing items like wipes, paper towels, or grease down the drain. These can clog pipes and cause overflows. Regularly inspect your plumbing for signs of blockages or damage. If you notice slow drains or gurgling sounds, address them early.

Consider installing a backwater valve to prevent sewage from entering your home during heavy rains. In areas with heavy spring rains, drainage systems can be overwhelmed. Keeping your gutters and downspouts clear helps direct water away from your foundation. A plumber can advise on the right prevention measures for your home.

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Frequently asked questions

Can I clean up sewage myself?

Cleaning sewage yourself is risky because of the high level of pathogens. Even small amounts can cause serious illness. Professional cleanup is recommended. If you must handle it, wear protective gear and use proper disinfectants. But for safety, leave it to the pros.

What should I do with items that got wet?

Porous materials like carpet, drywall, and upholstery should be thrown away because they cannot be fully disinfected. Non-porous items like glass or metal can be cleaned with a bleach solution. Document everything with photos for insurance. Your insurer can tell you what is covered.

How long does it take for mold to grow after a sewage backup?

Mold can begin growing within 24 to 48 hours in warm, damp conditions. Sewage adds moisture and nutrients, speeding up mold growth. Acting quickly to dry the area is important. Professional drying and dehumidification can reduce the risk, but you should act fast.

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