Sewage backups are the category of water damage where safety matters most. The water contains bacteria, viruses, and other pathogens, and it contaminates everything porous it touches. Cleanup is about sanitation first and drying second.
If you're still trying to figure out where the backup is coming from and who to call, start with our guide to sewage backup cleanup and who's responsible.
What sewage cleanup involves
Professional sewage cleanup usually includes containing the affected area, removing contaminated water and solids, removing porous materials that were contacted (carpet, pad, drywall, insulation), cleaning and disinfecting hard surfaces, and drying the structure. Workers use protective equipment because of the health risks.
Common causes
- Blocked household sewer line
- Grease, wipes, roots, or debris in your line can push sewage back up through the lowest drains.
- Municipal main backup
- A blockage or overload in the public sewer can cause backups into connected homes.
- Heavy rain
- Stormwater that gets into sewer systems can overload them during intense rain.
- Toilet overflow
- A toilet overflow containing waste is treated as contaminated even if it's small.
What to do right now
- Keep children, pets, and anyone with a weakened immune system away from the area.
- Stop using water in the house (toilets, sinks, laundry) to avoid adding to the backup.
- If water is near electrical outlets or appliances, stay out and shut off power at the breaker only if you can do so from a dry area.
- Contact your water/sewer utility if you suspect a problem in the public line; see the resource guide for how to tell.
- Photograph the damage from a safe distance.
- Ventilate if you can do so without walking through the affected area.
What to avoid
- Don't touch sewage or contaminated items without gloves, boots, and eye protection.
- Don't try to save carpet, pad, or upholstered items contacted by sewage.
- Don't use household fans to dry a sewage-affected area before it's been cleaned; that can spread contaminants.
- Don't run your HVAC system if ducts or the air handler were contaminated.
- Don't pour chemical drain cleaners into a backed-up line.
Health risk
Sewage can cause illness through skin contact, splashes, or contaminated surfaces. If anyone develops symptoms after exposure, contact a medical professional.
Why so much has to be removed
With clean water, the goal is to dry materials in place. With sewage, porous materials can't be reliably disinfected, so they're removed. That usually means carpet and pad, drywall and insulation up to a cut line above the contamination, and sometimes baseboards and cabinet bases. Hard surfaces like tile, concrete, and framing can typically be cleaned, disinfected, and dried.
Insurance and sewer backups
Many homeowners policies exclude sewer and drain backup unless a specific endorsement was added. If you're not sure, ask your agent before work begins. The insurance basics guide has more on this.
Damage it can cause
- Contaminated flooring, drywall, insulation, and furnishings
- Persistent odors in porous materials
- Health risks for occupants
- Contaminated ductwork if the HVAC system ran
- Mold growth if drying is delayed after cleaning
When professional help may be appropriate
- Any sewage enters living areas, beyond a very small, easily cleaned toilet overflow onto tile
- Carpet, drywall, or other porous materials were contacted
- The backup keeps recurring
- Occupants are young, elderly, pregnant, or immunocompromised
If any of these apply, it may be time to talk to a provider.
Request HelpQuestions to ask a provider
- What protective measures and containment will you use?
- Which materials will you remove, and how will you dispose of them?
- What disinfectants do you use, and when is it safe for my family to return?
- Do you verify cleaning before drying and rebuild?
- Can you provide proof of license and insurance? (Verify independently.)
Providers you reach through this site are independent. Verify licensing, insurance, and pricing directly with them before authorizing work.
Sewage Cleanup: common questions
What if sewage enters my home?
Keep people and pets away, stop using water, avoid contact without protective gear, and contact your utility if the public line may be involved. Sewage cleanup generally requires removing porous materials and disinfecting.
Can I clean up a sewage backup myself?
Very small incidents on hard, non-porous floors may be manageable with proper protective gear and disinfectant. Anything involving carpet, drywall, or a significant volume usually warrants professional help.
Is a sewage backup covered by insurance?
Often only if you have a sewer or water backup endorsement. Standard policies frequently exclude it. Confirm with your insurer.