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How Long Can You Live in a Home With Sewage Backup Smell?

Last updated October 26, 2026

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The short answer

Health Risks of Sewage Smell

Sewage backup smell comes from gases like hydrogen sulfide and methane, which can cause headaches, nausea, and respiratory irritation. Prolonged exposure may lead to more serious health issues, especially for children, the elderly, or anyone with asthma. If you feel unwell, see a doctor.

The smell itself is a warning sign that harmful bacteria and viruses may be present in your home. Even if you cannot see the backup, the air quality is compromised. Do not ignore it, as the risk increases with every day you stay.

  • Headaches and dizziness
  • Nausea or vomiting
  • Eye, nose, or throat irritation
  • Worsening asthma or allergies
  • Fatigue or confusion

Structural Damage from Delays

Sewage backup can seep into floors, walls, and drywall, causing rot, warping, and staining. The longer the moisture sits, the more extensive the damage becomes. You may face costly repairs to flooring, drywall, and even the foundation.

Mold can start growing within 24 to 48 hours in humid conditions, which is a concern in Port St. Lucie's humid climate. Mold spreads quickly and can damage your home's structure and your health. Acting fast limits the damage.

  • Warped or stained flooring
  • Soft or sagging drywall
  • Rotting wood framing
  • Mold growth on surfaces
  • Unpleasant odors that linger

When to Leave the Home

If the smell is strong or you have young children, elderly family members, or anyone with breathing problems, leave the home until the source is found and cleaned. Open windows and doors to ventilate, but do not rely on air fresheners, as they only mask the odor.

For minor, temporary issues like a clogged toilet that is fixed quickly, you may stay with good ventilation. But for a major backup, especially if sewage is visible, you should not stay. The pros can assess the situation and recommend whether it is safe to remain.

Finding the Source

The smell may come from a blocked drain, a broken pipe, or a full septic tank. Check toilets, sinks, and floor drains first. If you locate a clog, a plumber may resolve it. If the problem is in the main sewer line, you will need professional help.

Do not try to clean up sewage yourself, as it involves hazardous materials. The pros have the right equipment and safety measures to handle it. They can also identify hidden leaks, such as in walls or under floors, that you might miss.

Steps to Take Now

First, stop using water in the affected area to avoid worsening the backup. Turn off the water supply if possible, and keep children and pets away. Then, contact your insurance company to see if your policy covers sewage backup damage. Policies vary, and your insurer decides what is covered.

Next, call local water damage pros for an inspection. They can determine the extent of the problem and begin cleanup. If you live in Port St. Lucie, keep your shutoff valve location written down for emergencies. Acting quickly protects your health and your home.

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Frequently asked questions

Can I sleep in a room with a sewage smell?

No, sleeping in a room with a sewage smell is not safe. The gases can cause health issues, and you may not notice worsening symptoms while asleep. Ventilate the area and sleep elsewhere until the source is fixed.

What causes a sewage smell in a house?

Common causes include a clogged drain, a broken sewer pipe, a full septic tank, or a blocked vent pipe. Sometimes the smell comes from a dried-out P-trap in rarely used drains. A plumber can diagnose the exact cause.

How do I get rid of the sewage smell?

First, locate and fix the source, which may require a plumber. Then, clean the area thoroughly with disinfectants. The pros can remove contaminated materials and deodorize your home. Do not use masking agents, as they do not remove the danger.

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