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How Long Does Sewage Smell Last After Cleanup?

Last updated October 25, 2026

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The short answer

What Affects the Smell Duration

The duration of sewage smell depends on several factors. Porous materials like drywall, wood, carpet, and unsealed concrete can absorb the odor and release it slowly over time. If those materials are not removed or treated, the smell can persist for weeks.

Humidity also plays a role. In a humid subtropical climate with hot summers and spring hail and thunderstorms, moisture in the air can keep odors active longer. Good airflow and dehumidifiers help speed up the process, but the smell may still linger in hidden spaces like wall cavities or under flooring.

How to Speed Up Odor Removal

After the visible sewage is cleaned, you can help reduce the smell by opening windows, running fans, and using dehumidifiers. Keep the area dry and well-ventilated for several days. Wash any hard surfaces with a disinfectant cleaner and allow them to air dry completely.

For lingering odors, you can place bowls of white vinegar or baking soda in the room, but these only mask the smell. The real fix is removing any contaminated porous materials and treating the area with an enzyme-based odor neutralizer. If the smell persists, the source may be in the subfloor or behind walls.

  • Open windows and use fans to create cross-ventilation
  • Run a dehumidifier to lower moisture levels
  • Wash hard surfaces with a disinfectant and rinse well
  • Remove and discard porous items like carpet and drywall
  • Use enzyme-based cleaners on the affected area
  • Keep the room dry for several days after cleaning

When to Call the Pros

If you have done a thorough cleanup and the smell still does not fade within a week or two, you may need professional help. Local water damage pros have industrial fans, dehumidifiers, and specialized cleaning products that can reach odors trapped in walls or under floors.

They can also use moisture meters to find hidden damp spots that you cannot see. If the smell is coming from a plumbing issue, such as a broken pipe or a backup that reached the subfloor, you may need a plumber to fix the source first. In some cases, the pros may need to remove and replace sections of flooring or drywall.

Health and Safety During the Process

Sewage contains bacteria and viruses, so take care while cleaning. Wear rubber gloves, a mask, and eye protection. Avoid touching your face and wash your hands thoroughly after handling any contaminated items. If you feel unwell, see a doctor.

Keep children and pets away from the affected area until it is fully cleaned and dry. If the sewage came from a septic system or a large backup, there may be additional hazards. In those cases, you might want to consult a mold professional if you suspect mold growth, since mold can develop within 24 to 48 hours in damp conditions.

Preventing Future Sewage Smells

Once the smell is gone, you can take steps to prevent it from returning. Check your plumbing for leaks or cracks that could allow sewage to seep into your home. Keep your drain traps filled with water, especially in rarely used drains, and avoid flushing items that can clog pipes.

If you live in Mesquite, keep your shutoff valve location written down so you can quickly stop a future backup. Regular maintenance of your sewer lines can help, but if you experience repeated backups, you may need to consult a plumber to inspect the main line or consider a backwater valve installation.

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Frequently asked questions

Can I use bleach to remove the sewage smell?

Bleach can disinfect hard surfaces, but it does not neutralize the odor molecules in porous materials. It may actually make the smell worse if it reacts with ammonia in the waste. Use an enzyme-based cleaner instead, which breaks down the organic matter causing the smell.

Will the smell go away on its own?

Sometimes, if the contamination is minor and the area dries quickly, the smell may fade within days. But sewage odor often persists because the source is deep in porous materials or hidden spaces. If it does not fade after a week of good ventilation, you need to find and treat the source.

Should I throw away furniture that got wet?

If the furniture is upholstered or made of particleboard, it likely absorbed sewage and cannot be fully cleaned. The smell will keep returning. Wood furniture may be salvageable if it is sealed, but any porous item that cannot be thoroughly disinfected should be discarded.

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