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Health Dangers of Sewage Backup Inside Your Home

Last updated October 25, 2026

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The short answer

What Is in Sewage Water

Sewage contains human waste, household chemicals, and water from drains. It also carries a wide range of harmful organisms, including bacteria like E. Coli and salmonella, viruses such as hepatitis A, and parasites like giardia. These pathogens can survive on surfaces for days or longer if the area is not properly cleaned.

When sewage backs up into your home, it spreads through carpets, drywall, and baseboards. Even a small amount can contaminate a large area. The longer the material stays wet, the deeper it soaks into porous materials, making thorough cleanup more difficult and increasing health risks for everyone in the house.

How Your Family Can Get Sick

You can become ill through direct contact with sewage water or contaminated surfaces. Ingesting even tiny amounts, which can happen if you touch your face without washing your hands, can cause gastrointestinal illness. Breathing in dust or droplets from dried sewage can also introduce pathogens into your respiratory system.

Children and pets are especially at risk because they are more likely to touch contaminated floors and put their hands or paws in their mouths. Anyone with a weakened immune system, older adults, and pregnant women should avoid the affected area entirely until cleanup is complete. If anyone experiences nausea, diarrhea, fever, or skin irritation, contact a doctor promptly.

  • Wash hands thoroughly with soap and clean water after any contact
  • Keep children and pets away from affected areas
  • Do not eat, drink, or smoke near the contaminated zone
  • Wear rubber boots, gloves, and a mask if you must enter
  • Open windows to improve ventilation while cleanup happens

Immediate Steps to Protect Yourself

If sewage backs up in your home, shut off water to the affected plumbing if you can do so safely. Turn off the HVAC system to prevent contaminated air from circulating through the house. Leave the area and avoid walking through standing water, as sewage can soak into your shoes and clothing.

Contact your insurance company as soon as possible to understand what your policy covers. Policies vary, and your insurer decides what is covered. Take photos of the damage for your records, but do not touch anything until you know what is safe. See a doctor if you feel unwell, and do not attempt cleanup of large areas without proper equipment and training.

Why Professional Cleanup Matters

Sewage cleanup involves more than removing visible water. The pros use specialized equipment to extract contaminated water, remove porous materials like carpet and drywall, and apply disinfectants that kill pathogens. They also address hidden moisture in walls and subfloors, which can lead to mold growth if left untreated.

Attempting to clean sewage yourself can spread contamination and leave behind harmful residues. The pros follow safety protocols to protect themselves and your family, including proper disposal of waste and thorough drying. Their work usually involves structural drying and dehumidification to ensure the area is safe to reoccupy.

Long Term Health Considerations

Even after visible sewage is removed, residual contaminants can remain in porous surfaces. Mold may begin growing within 24 to 48 hours on wet materials, adding respiratory risks to the original health hazards. A thorough drying process and moisture mapping can help identify hidden damp spots that need attention.

Keep your shutoff valve location written down for future reference. After cleanup, watch for musty odors or recurring dampness, which may signal that some materials need further treatment. Humid conditions can slow drying and encourage mold, so thorough moisture control is important. Your health and your home's safety depend on complete remediation.

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Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.

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Frequently asked questions

Can I clean sewage backup myself?

Small, contained spills on hard surfaces might be handled with proper protective gear and disinfectants. But sewage backup that soaks into walls, flooring, or personal items is a health hazard. The pros have the equipment and training to remove contaminated materials safely and dry the structure thoroughly.

How long does sewage contamination last?

Pathogens can survive on surfaces for days or weeks, depending on temperature and moisture. Even after the visible water is gone, bacteria and viruses can remain in porous materials. That is why complete removal of affected materials and professional disinfection are necessary to reduce health risks.

What should I throw away after sewage backup?

Porous items like carpets, upholstered furniture, mattresses, and drywall that came into contact with sewage should be discarded. Non-porous items like glass, metal, and hard plastic can be cleaned and disinfected. When in doubt, it is safer to discard the item, especially if it is difficult to clean thoroughly.

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