Service guide

Sewage backup cleanup

Why sewage needs professional handling, what causes backups, what to do in the first hour and how insurance usually treats it.

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Updated November 13, 2026

Why sewage backups need professional cleanup

Sewage carries bacteria, viruses and parasites. Anything porous it touches, such as carpet, pad, drywall and upholstered furniture, can't be reliably disinfected and is usually discarded. Hard surfaces have to be cleaned and disinfected, and the area dried and checked before anyone uses it again.

Common causes

  • Tree roots growing into an older clay or cast-iron sewer lateral
  • Grease, wipes and debris blocking the main line
  • Heavy rain overwhelming a city sewer and pushing water back up through floor drains
  • A failed sewage ejector pump in a basement bathroom
  • A collapsed or bellied section of sewer pipe

What to do right away

  1. Stop using water in the house: no flushing, laundry, showers or dishwashers.
  2. Keep everyone, especially children and pets, out of the affected area.
  3. Turn off the HVAC system if it could spread air from the affected area.
  4. Don't try to clean it up with household products or a vacuum.
  5. Call a plumber to clear or repair the line and a restoration company to clean up.

Is a sewage backup covered?

Many homeowners policies exclude sewer and drain backup unless you've added a water backup endorsement. If the backup was caused by a city sewer problem, the city may have its own claim process with short deadlines. Check your policy and report quickly either way.

Sources

Questions people ask

Can I clean a small sewage backup myself?

For a toilet overflow on a tile floor, careful cleanup with gloves and disinfectant may be enough. If sewage reached carpet, walls or more than one room, or came up through a floor drain, have it handled professionally.

Is it safe to stay in the house?

Stay out of the affected area. If it's in living spaces, the only bathroom or the kitchen, or if anyone in the home is vulnerable, staying elsewhere until cleanup is done is the safer choice.

What category of water is sewage?

Category 3, the most contaminated class under the IICRC S500 standard. It requires removal of porous materials and disinfection of everything else.

Talk it through with a restoration company

Describe where the water came from and how long it's been wet. You'll be connected with an independent company that covers your area.

Get connectedCalls go to an independent restoration company that serves your ZIP code. We don't do the work.