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Can Sewage Backup Cause Long-Term Illness?

Last updated October 31, 2026

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The short answer

Health Risks from Sewage Exposure

Sewage contains bacteria, viruses, parasites, and toxic chemicals. Direct contact or inhaling airborne particles can cause gastrointestinal illness, skin infections, or respiratory problems. Some pathogens, like hepatitis A or certain strains of E. Coli, may lead to serious complications if not treated promptly.

Long-term illness can develop if contaminated materials remain in your home. Porous items like drywall, carpet, and insulation can harbor pathogens for weeks. Even after visible cleanup, microscopic organisms can persist, especially in damp areas. The key is thorough sanitation and drying to prevent ongoing exposure.

  • Wear gloves, boots, and a mask during cleanup
  • Wash hands thoroughly after any contact
  • Avoid touching your face or mouth
  • Keep children and pets away from affected areas
  • Open windows to improve ventilation
  • See a doctor if you experience nausea, fever, or breathing trouble

Mold Growth After Sewage Backup

Sewage backup often leaves behind moisture that encourages mold growth. Mold spores can become airborne and trigger allergies, asthma attacks, or respiratory infections. For people with weakened immune systems, mold exposure may cause more severe health problems over time.

Mold can grow on wood, drywall, and fabrics within 24 to 48 hours. Even if you remove visible sewage, hidden moisture in walls or under flooring can lead to mold. Professional drying and dehumidification help reduce mold risk, but you must act quickly to prevent long-term issues.

  • Check for musty odors, which signal hidden mold
  • Inspect behind baseboards and under cabinets
  • Use a dehumidifier to lower indoor humidity
  • Discard porous materials that cannot be cleaned
  • Consider mold testing if you have health concerns

Immediate Steps to Protect Your Health

After a sewage backup, your first priority is safety. Evacuate the affected area, especially if you have respiratory conditions. Turn off heating and cooling systems to avoid spreading contaminants through the air. Do not use the water or flush toilets until the source is controlled.

Wear protective gear during any cleanup. Remove standing water and solid waste carefully. Disinfect surfaces with a bleach solution or commercial sanitizer. Dry the area thoroughly using fans and dehumidifiers. If the backup is extensive, local water damage pros can handle the cleanup and sanitation.

When to Call Water Damage Pros

If sewage affects a large area, or if you cannot safely clean it yourself, contact the pros. They have equipment to extract water, dry structures, and sanitize surfaces. They can also assess hidden damage that you might miss, such as moisture trapped in walls or subflooring.

Professional help is especially important if the sewage has soaked into drywall, insulation, or carpet. These materials often need removal to prevent long-term contamination. The pros will also use dehumidifiers and air movers to dry the space, reducing mold and bacteria growth.

  • Sewage covers more than a small area
  • You smell strong sewage odors after cleanup
  • You have health conditions like asthma or allergies
  • The backup originated from a municipal line
  • You need help removing and disposing of contaminated materials

Preventing Future Sewage Backups

To reduce the risk of future backups, maintain your plumbing and avoid flushing items like wipes or grease. Install a backwater valve if you have a basement, as this can prevent sewage from entering your home during heavy rains. Check your drainage regularly, especially if you live in a coastal area with heavy rainfall.

Know where your main shutoff valve is located and how to turn it off in an emergency. Keep the shutoff valve location written down near your water heater. Regular inspections by a plumber can catch blockages early. Also, consider a sewage backup cleanup plan so you know what to do if it happens.

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Frequently asked questions

How long does it take to get sick after sewage exposure?

Symptoms can appear within hours or days, depending on the pathogen. Gastrointestinal issues like diarrhea or vomiting may start quickly, while respiratory problems might take longer. If you feel unwell, see a doctor promptly.

Can cleaning sewage myself make me sick?

Yes, without proper protective gear and ventilation, you risk inhaling bacteria or mold spores. Even with precautions, hidden contamination can remain. If you have health concerns, consider hiring professionals to handle the cleanup.

Should I throw away items that touched sewage?

Porous items like carpet, drywall, and upholstered furniture often cannot be fully sanitized and should be discarded. Hard surfaces like tile and metal can be cleaned and disinfected. When in doubt, throw it out to avoid long-term health risks.

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