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What Should I Do If I Find Sewage Backing up in Multiple Drains?

Last updated October 25, 2026

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The short answer

Act Fast to Stop the Flow

The first thing to do is stop using every drain in the house. That means no flushing toilets, no running sinks, no showers, and no laundry. Sewage backing up in multiple drains usually means the main sewer line is blocked, and any water you send down will push more sewage upward into your home.

Shut off the main water supply to your house if you can locate the valve. It is often near the water meter or where the main line enters the basement. Keep the shutoff valve location written down so you can find it quickly in an emergency.

Keep Everyone Safe

Raw sewage contains harmful bacteria and viruses. Keep children and pets out of any room with standing sewage. Open windows to let fresh air in, but avoid using fans that might spread airborne particles into other parts of the house.

Wear rubber gloves, boots, and a mask if you must walk through the area to shut off utilities. Do not attempt to clean up sewage yourself beyond small, contained spots. See a doctor if you feel unwell after exposure, and wash any skin contact with soap and water right away.

  • Do not flush toilets or run water until the pros have finished the initial cleanup
  • Turn off the main water valve if you can reach it safely
  • Open windows for ventilation, but avoid fans that blow air around
  • Keep children and pets away from affected rooms
  • Do not touch sewage with bare hands or use household cleaners on large spills

Call the Pros for Sewage Cleanup

Sewage backup cleanup requires specialized equipment and safety procedures. Local water damage pros handle the removal of contaminated water, disinfection, and drying. They also identify the cause of the blockage, which might be a damaged pipe or a tree root intrusion.

The work usually involves extracting standing water, removing contaminated materials like drywall and flooring, and applying antimicrobial treatments. The pros will also use dehumidifiers and air movers to dry the structure thoroughly. This process helps prevent mold growth and further damage to your home.

What the Cleanup Involves

Expect the pros to remove all porous materials that touched sewage, such as carpet, padding, drywall, and insulation. These materials cannot be safely cleaned. Non-porous surfaces like tile and concrete can be washed and disinfected, but the pros will decide what is salvageable.

Structural drying and dehumidification are often necessary to dry hidden moisture in walls and subfloors. The pros may also perform a moisture mapping inspection to ensure everything is dry before repairs begin. This step is important to avoid long-term issues like rot and mold.

Prevent Future Backups

After the cleanup, ask the pros about the cause of the backup. If the issue is a main sewer line problem, you might need a plumber to inspect the pipes. Regular maintenance, like not flushing wipes or grease, can help prevent clogs.

Consider installing a backwater valve on your main drain, which can stop sewage from entering your home during heavy rains or blockages. Check your insurance policy to see if sewage backup is covered. Policies vary, and your insurer decides what is covered. Keep records of the damage and cleanup for any claim.

Talk to someone now

Phones are answered 24/7 for Detroit and nearby communities.

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Frequently asked questions

Can I clean up sewage myself?

Cleaning up sewage is risky because it contains pathogens. For small spills, you can use bleach and water, but large backups need professional treatment. The pros have protective gear and industrial disinfectants, and they handle disposal properly.

How long does sewage cleanup take?

The time depends on the extent of the backup and the materials affected. A simple cleanup might take a day, but if sewage soaked into drywall and flooring, the process can take several days, including drying and disinfection.

Will my insurance cover sewage backup?

Coverage depends on your specific policy. Some policies include sewer backup coverage as an add-on, while others exclude it. Contact your insurance company to discuss your situation. Policies vary, and your insurer decides what is covered.

Call Now (313) 766-2970