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Lake Merritt Water ResponseWater Damage Help · Oakland, CA

How Do Pros Remove Sewage Odor From a Home?

Last updated October 26, 2026

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The short answer

Find the Source First

The first step is locating where the sewage came from and where it traveled. Pros check toilets, drains, floor drains, and the main sewer line. They also look for hidden leaks behind walls or under floors. If the source is a broken pipe or a backup, that issue must be fixed before cleaning starts.

Once the source is stopped, pros trace the path of the sewage. They use moisture meters and sometimes thermal imaging to find wet spots. Any porous material that soaked up sewage, like carpet, padding, drywall, or insulation, usually needs to be removed. Non-porous surfaces can often be cleaned and reused.

  • Check toilet seals and wax rings
  • Inspect floor drains and sump pits
  • Look for cracked or blocked sewer lines
  • Use moisture meters to find hidden wet areas

Remove Contaminated Materials

Sewage is a biohazard, so anything it touches that cannot be fully disinfected must go. This includes carpet, carpet padding, upholstered furniture, drywall that got wet, and insulation. Pros cut out affected sections and bag them properly for disposal. They wear protective gear to avoid contact with harmful bacteria.

Removing these materials also removes a large part of the odor. The longer sewage sits, the deeper it soaks in, so acting quickly helps limit what needs to be thrown out. After removal, the exposed areas are inspected again to make sure no hidden contamination remains.

  • Carpet and padding
  • Drywall below the water line
  • Insulation and fiberglass
  • Wooden baseboards if saturated

Clean and Disinfect Surfaces

After contaminated items are gone, pros clean every surface that sewage touched. They start with a thorough wash using a detergent to remove dirt and residue. Then they apply an EPA-registered disinfectant that kills bacteria and viruses. This is different from a simple bleach rinse, because it targets pathogens specifically.

Special attention goes to cracks, crevices, and porous surfaces like concrete. Pros may use a stiff brush or a pressure washer for concrete floors. They also clean the air ducts if sewage vapors traveled through them. After disinfection, they rinse and dry the area to prevent mold growth.

Dry Everything Thoroughly

Moisture is the enemy after cleaning. Even if surfaces look dry, moisture can hide in wood, concrete, and wall cavities. Pros use industrial air movers and dehumidifiers to pull moisture out of all materials. This drying process can take several days, and they monitor moisture levels with meters to know when it is complete.

Drying is not just about comfort; it prevents mold and lingering odors. Sewage smell often comes from trapped moisture and bacteria. If the area stays damp, the odor returns even after a good cleaning. Pros may also use a drying chamber for hard-to-reach spaces.

Use Odor Neutralizers

Once the area is clean and dry, pros tackle any remaining smell. They use odor-neutralizing agents that chemically bond with odor molecules, not just air fresheners that cover the smell. These can be applied as sprays, foggers, or placed in the room. For stubborn odors, an ozone machine may be used, but only in an empty room because ozone is harmful to breathe.

Activated charcoal or hydroxyl generators are other tools. Hydroxyl generators are safer because they can be used while people are present. Pros choose the method based on the severity and the materials involved. The goal is to leave the home smelling fresh, not just masked.

When to Call the Pros

Sewage cleanup is not a DIY job for most homeowners. The risk of illness from bacteria and viruses is high, and improper cleaning can leave dangerous pathogens behind. Also, sewage can spread to areas you cannot see, like inside walls or under flooring. Pros have the equipment and training to handle it safely.

If you live in Oakland and face sewage backup, acting quickly is important. The longer sewage sits, the more damage it causes. Professional help is usually needed for anything beyond a small, contained spill. They can also advise on whether materials can be saved or must be replaced.

  • Sewage covers more than a small area
  • The smell persists after cleaning
  • You or family members feel unwell
  • The source is a sewer line backup

Need help right now?

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

How long does sewage odor last after cleanup?

If the source is removed and surfaces are properly cleaned and dried, the odor should be gone within a few days. If it lingers, it usually means something was missed, like hidden moisture or contaminated material. Pros may need to do another round of treatment.

Can I just use bleach to remove the smell?

Bleach can kill some bacteria, but it does not penetrate porous materials well and does not neutralize all odors. It also does not remove the organic matter that feeds odor. Pros use specialized disinfectants and odor neutralizers that are more effective and safer.

What if the smell comes back after a few weeks?

A returning smell often means the source was not fully fixed or moisture is trapped. It could also be a new leak or a cracked sewer pipe. You should have a professional inspect the area again to find the root cause before it causes more damage.

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