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What Diseases Can Sewage Backup Cause?

Last updated October 25, 2026

The short answer

Gastrointestinal Illnesses

Sewage often contains fecal matter, which introduces viruses, bacteria, and parasites into your home. These can cause severe stomach and intestinal distress if accidentally ingested. Common examples are norovirus, which leads to vomiting and diarrhea, and bacterial infections like E. Coli and Salmonella. Parasitic infections such as giardiasis and cryptosporidiosis are also possible, causing prolonged gastrointestinal symptoms.

These illnesses typically spread through the fecal-oral route. This can happen if you touch a contaminated surface and then your mouth, or if contaminated water splashes near food preparation areas. Thorough, frequent handwashing with soap is your primary defense. Always assume any surface touched by sewage is contaminated until professionally cleaned and disinfected.

Respiratory and Skin Infections

Airborne contaminants are a significant hazard during a sewage backup. As contaminated water evaporates, it can aerosolize bacteria and mold spores. Inhaling these particles may lead to respiratory infections, allergic reactions, or worsen asthma. Legionnaires' disease, a severe form of pneumonia, is a known risk from inhaling mist containing the Legionella bacteria.

Direct skin contact with sewage water poses its own dangers. Bacteria in the water can enter through cuts, scrapes, or even pores, leading to skin infections, rashes, or cellulitis. Open wounds are particularly vulnerable to serious bacterial infections. Wearing waterproof gloves, boots, and protective clothing is essential if you must be in the affected area before cleanup begins.

Hepatitis and Other Viral Risks

Hepatitis A and Hepatitis E are viral infections that can be present in sewage. These viruses primarily affect the liver and are transmitted through ingestion of contaminated matter. Symptoms include jaundice, fatigue, abdominal pain, and fever. While many people recover, the illness can be severe, especially for older adults or those with pre-existing liver conditions.

The risk of viral transmission underscores why you should never handle sewage cleanup without proper protection. These viruses are resilient and can survive on surfaces for weeks. Vaccination can provide protection against Hepatitis A, but it is not a substitute for avoiding exposure. If you suspect you have been exposed, monitoring your health and consulting a doctor is prudent.

Why Professional Cleanup Is Necessary

Standard household cleaning cannot eliminate the biological hazards in sewage. The pros use industrial-grade disinfectants and specialized equipment to sanitize the area safely. They follow strict protocols to contain the contamination, preventing it from spreading to other parts of your home. Their process addresses both visible water and hidden moisture that can lead to mold.

Attempting a do-it-yourself cleanup puts your health at immediate risk and can lead to long-term problems like structural rot and persistent mold growth. The pros have the training to handle Category 3 water, which is grossly contaminated. They ensure all porous materials that cannot be salvaged are removed and disposed of properly to prevent future health issues.

Immediate Actions and Long-Term Health

Your first step after a sewage backup is to secure the area and call for professional help. Do not use sinks or toilets connected to the affected line. Contact a plumber to address the source if it is a plumbing issue. Document the damage with photos for your insurance records, but prioritize getting everyone to safety first.

Long-term health effects can arise from improper cleanup, primarily from mold growth. Mold can begin growing within 24 to 48 hours in the humid conditions left behind. Persistent mold exposure can cause chronic respiratory issues and allergies. A complete professional restoration is the most reliable way to protect your home and health from these secondary dangers.

  • Treat all sewage water as an immediate biohazard and avoid contact.
  • Keep children, pets, and individuals with compromised immunity away from the area.
  • If contact occurs, wash the area thoroughly with soap and clean water.
  • Discard any porous items like carpet, upholstery, or drywall that absorbed sewage.
  • Ventilate the area if safe to do so, but do not use household fans which can spread contaminants.
  • Seek medical advice if you develop any symptoms like fever, diarrhea, or skin irritation.

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Frequently asked questions

What are the first signs I might be getting sick from sewage exposure?

Early signs often include stomach cramps, nausea, diarrhea, or vomiting from gastrointestinal illness. For respiratory issues, watch for a new or worsening cough, fever, or shortness of breath. Skin contact may cause a rash, redness, or swelling. If you develop any of these symptoms, it is wise to see a doctor.

Can sewage backup cause mold sickness too?

Yes. The lingering moisture from a sewage spill creates perfect conditions for mold to grow rapidly. Mold exposure can cause allergic reactions, asthma attacks, and other respiratory problems. A thorough professional cleanup includes drying the structure completely to prevent this secondary health hazard from taking hold in your home.

Does homeowners insurance cover diseases from a sewage backup?

Homeowners insurance may cover property damage from a sudden, accidental backup, but it does not cover medical bills for illnesses. Health insurance would handle treatment costs. Policies vary, and your insurer decides what is covered. Always check your specific policy details and report the incident to your insurer promptly.

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