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Sewage Backup Health Hazards: Diseases and Pathogens

Last updated October 25, 2026

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The short answer

What Pathogens Live in Sewage

Raw sewage contains a mix of microorganisms that can make you sick. Common bacteria include E. Coli, Salmonella, and Shigella. Viruses like hepatitis A and norovirus may also be present, along with parasites such as Giardia and Cryptosporidium.

These pathogens enter your body through ingestion, skin contact, or inhalation of contaminated mist. Even a small amount of sewage on a surface can pose a risk. The longer the material sits, the more chance it has to dry and release particles into the air you breathe.

  • Wash hands with soap and clean water after any contact
  • Do not eat, drink, or smoke near contaminated areas
  • Keep children and pets away until cleanup is finished
  • Open windows to ventilate if safe to do so
  • See a doctor if you feel unwell after exposure

Symptoms to Watch For

Symptoms from sewage exposure often appear within hours to a few days. Diarrhea, stomach cramps, nausea, and vomiting are common. You might also develop a fever, headache, or muscle aches. Skin contact can cause rashes, itching, or infected wounds.

Respiratory symptoms like coughing or wheezing can happen if you breathe in contaminated dust or mist. If you have a weakened immune system, are pregnant, or have chronic conditions, your risk is higher. Anyone with severe or lasting symptoms should see a doctor promptly.

How to Protect Yourself During Cleanup

If you decide to handle any cleanup yourself, wear rubber boots, gloves, and eye protection. Use an N95 mask to reduce inhalation risk. Cover any cuts or scrapes with waterproof bandages before starting. Remove and wash contaminated clothing separately in hot water.

Do not use fans that could spread contaminated droplets. Avoid tracking sewage into clean parts of your home. Set up a barrier with plastic sheeting if you can. Afterward, disinfect tools and surfaces with a bleach solution or a product labeled for sewage cleanup.

When to Call the Pros

Large sewage backups, porous materials like drywall and carpet, or contamination that has spread into walls and flooring are beyond a typical DIY effort. The pros have commercial-grade equipment and training to remove contaminated material and disinfect affected areas safely.

Professional sewage cleanup typically includes extraction, removal of saturated porous items, and sanitation of hard surfaces. They also dry the structure to prevent mold growth. If you live in Kirkland, consider having a local water damage service handle the job to reduce your exposure risk.

  • Sewage has soaked into drywall, insulation, or carpet
  • The backup involves a large area or multiple rooms
  • You have health conditions that raise your risk
  • The smell persists after basic cleaning

Preventing Future Sewage Backups

Regular maintenance can reduce the chance of another backup. Have a plumber inspect your sewer line for cracks or blockages. Avoid flushing wipes, grease, or paper products that can clog pipes. Install a backwater valve if your area is prone to sewer surcharging.

Keep the area around your main cleanout accessible. Know where your shutoff valve is located and how to use it. Heavy rains can stress sewer systems, so staying alert during storms is wise.

Water damage does not wait

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 sewage backup make you sick?

Yes, sewage contains bacteria, viruses, and parasites that can cause gastrointestinal illness, skin infections, and respiratory issues. Symptoms may include diarrhea, vomiting, fever, and rash. Seek medical attention if you feel unwell after exposure.

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

Symptoms can appear within hours or take up to a few days, depending on the pathogen. Norovirus often shows up quickly, while other organisms may incubate longer. If you develop symptoms, monitor them and see a doctor if they persist or worsen.

Is it safe to stay in a house after a sewage backup?

It is safer to leave the area until cleanup is complete, especially if the contamination is extensive. Open windows for ventilation and avoid touching contaminated surfaces. If you must stay, keep children and pets away from affected rooms and wash hands frequently.

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