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Sewage backing up into your tub or basement: what to do

What to do when sewage backs up: stop using water, stay safe, plumber or city, insurance coverage, cleanup and prevention.

Quick answer

Stop using water right away, keep kids and pets away, and wear gloves and boots. Call a plumber; if neighbors have the same problem, call your city or sewer district too. Photograph everything and call your insurer, though many policies cover sewer backups only with a water backup add-on. Professional cleanup is usually best; soaked carpet and lower drywall are often thrown out. Dry within 24 to 48 hours.

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Your checklist

  • Stop using water
  • Keep kids and pets away; wear gloves
  • Call a plumber; call the city if neighbors are affected
  • Photograph and call insurance
  • Get professional cleanup; dry in 24–48 hours
  • Prevent it: no wipes or grease

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Stop using water

No flushing, showers, dishwashers or laundry. More water makes the backup worse.

Stay safe

Sewage carries germs. Keep kids and pets away, wear gloves and rubber boots, stay away from water near outlets, and wash well afterward.

Find the cause

A plumber can clear a clog in your line. If neighbors have the same problem, the city sewer main may be blocked; call your city or sewer district. Homeowners are usually responsible for the line from the house to the city main.

Insurance

Photograph everything and call your insurer. Many standard homeowners policies exclude sewer backups unless you added “water backup” coverage.

Cleanup

Sewage cleanup is usually best left to professionals. Soaked carpet, padding and lower drywall are typically thrown out. Dry everything within 24 to 48 hours to prevent mold.

Prevention

Don’t flush wipes or pour grease down drains. Ask a plumber about a backwater valve, and consider water backup coverage.

Official sources, and where to look

To find your local office, search for:

  • [your city] sewer backup report
  • [your city] backwater valve program

Pick sites that end in .gov. Official forms are almost always free.

Common questions

Who pays if the city sewer caused the backup?

Sometimes the city, if it was negligent, but rules and deadlines for claims against cities are strict and short. Report it right away and ask how to file a claim. More ›

Can I clean up sewage myself?

Small, contained spills, with gloves, boots and disinfectant, maybe. Large backups are best handled by professionals because of health risks. More ›

Why is sewage coming up in my tub?

Usually a clog in your main sewer line, so water from toilets and drains has nowhere to go and comes up at the lowest drain, often the tub or basement floor drain. More ›

Does homeowners insurance cover sewer backup?

Often not, unless you added water backup or sewer backup coverage. Check your policy, and consider adding it. More ›

Who is responsible for the sewer line?

Usually the homeowner is responsible for the line from the house to the city main; the city handles the main. Rules vary by city. More ›

Is sewage backup dangerous?

Yes, it can carry bacteria and viruses. Avoid contact, keep kids and pets away, wear gloves and boots, and wash well. More ›

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Not yet reviewed by an expert. Last checked 2026-10-29. This is general help, not legal, medical or professional advice. Rules are different in every state.