How Long Does Sewage Odor Last After Cleanup?

The smell stays if the sewage itself is not fully removed. Even after cleaning visible waste, tiny particles and contaminated water can remain in porous materials like drywall, carpet padding, and subflooring. These materials absorb sewage and continue to release gases. If the area does not dry completely, microbial growth can produce new odors. Thorough cleaning addresses all these sources to stop the odor at its root.

• Incomplete removal of all solid waste.
• Moisture trapped inside walls or under flooring.
• Contaminated porous materials like drywall and insulation.
• Microbial growth in damp, unclean areas.
• A hidden leak or backup that wasn't found.
• Improper cleaning agents that mask but don't remove odor.

Do not assume the smell will just go away with time. Sewage contains dangerous pathogens. A persistent odor is a warning sign of ongoing contamination. You should contact the pros who did the work to reassess the area. It may require removing more material or finding a hidden source of moisture or waste. A properly dried and cleaned area should not have a lingering sewage smell once the work is complete.

Your first step is to contact local water damage pros for an inspection. They can use moisture meters and thermal cameras to find hidden wet areas. You may also need a plumber to check for leaks in drain lines or sewer pipes. Addressing the root cause is the only way to achieve a permanent solution.

• Inspect for new signs of water or waste.
• Check that all previously wet areas are still dry.
• Look for plumbing leaks under sinks or toilets.
• Verify that floor drains have water in their traps.
• Ensure roof vents and plumbing stacks are not blocked.
• Consider if a recent rainstorm caused new intrusion.