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Sewage cleanup is the most hazardous part of basement water damage restoration. The IICRC S500 standard classifies sewage as Category 3, grossly contaminated water, and requires removal of porous materials it touched.
The First Hour After a Sewage Backup
- Stop using waterNo flushing, showers, laundry or dishwasher. Every drain upstairs can push more sewage into the basement.
- Keep people and pets outEspecially children, older adults, anyone pregnant and anyone with a weakened immune system.
- Shut off power to the areaOnly from a dry location; never stand in the water to reach a switch.
- Call a plumber and a cleanup companyOne clears the line; the other handles the contaminated materials. They are separate jobs.
- Document itPhotos and video of the water, the drain it came from and the water line.
Health Risks
Sewage contains bacteria, viruses and parasites. Keep children, pets, pregnant women, older adults and anyone with a weakened immune system out of the area. Do not touch sewage-soaked items without waterproof gloves, boots and eye protection, and wash hands thoroughly. The CDC recommends avoiding contact with floodwater and sewage wherever possible.
Common Causes of Basement Sewage Backups
- A blocked private sewer lateral: tree roots, grease or debris between the house and the city main.
- A blockage in the city main, sending water back up the lowest drain in the house.
- A basement toilet or floor drain that is lower than the street sewer during a blockage.
- A failed ejector pump in a basement bathroom.
In most Utah cities, including Eagle Mountain, the homeowner is generally responsible for the private sewer lateral from the house to the city main, and the city maintains the main. Confirm with Eagle Mountain City if you are unsure where a blockage is, and contact the city promptly if the main was involved, since claims against a city have their own notice rules and deadlines.
Rural homes on septic, like those in Cedar Pass Ranch, have their own backup risks.
The Category 3 Cleanup Process
- Protect peopleRestrict access; crews wear protective suits, gloves, boots and respirators.
- Contain the areaPlastic barriers and negative air keep contaminated air and dust from reaching the rest of the house.
- Extract sewageLiquids and solids are removed with dedicated equipment.
- Remove porous materialsCarpet, pad, drywall, insulation and porous contents that sewage touched are removed and bagged.
- Clean and sanitizeHard surfaces are cleaned with detergent, then treated with an EPA-registered disinfectant.
- DryDehumidifiers and air movers dry the structure.
- VerifyVisual inspection and moisture readings; optional sampling.
What Has to Go and What Can Be Cleaned
| Item | Usually | Why |
|---|---|---|
| Carpet and pad | Removed | Cannot be reliably sanitized after Category 3 water |
| Drywall and insulation it touched | Removed | Porous; the CDC says to discard sewage-contaminated drywall and insulation |
| Wood framing | Cleaned, disinfected and dried | Replaced only if it is damaged or stays wet |
| Concrete, tile, metal | Cleaned and disinfected | Non-porous surfaces can be sanitized |
| Upholstered furniture, mattresses, boxes | Discarded | Cannot be cleaned through |
| Hard plastic and metal items | Cleaned and disinfected | If they can be fully washed |
Cleanup, Plumbing and Rebuild Are Separate Jobs
A sewage backup often turns into three projects: clearing and fixing the line, cleaning up the contaminated basement, and rebuilding. Ask for each one as its own scope, even if one company does more than one. That way you can compare bids line by line, see who is responsible for what, and avoid paying for a cleanup while the line that caused it is still broken.
- Which rooms and materials are included in the cleanup, in writing.
- What containment, cleaning, disinfection and disposal are included.
- How drying will be measured and when the job counts as done.
- Who is finding and fixing the cause of the backup.
- What is excluded: rebuild, contents, testing, permits.
Insurance and Sewer Backups
Standard homeowners policies often do not cover sewer or drain backups unless you added a water-backup endorsement, and flood policies treat backups differently from outside flooding. Read the declarations page for a backup endorsement and its limit, call your agent before permanent repairs start, and keep cleanup, plumbing and rebuild invoices separate so the insurer can see what each one covers.
Preventing the Next Backup
Backwater valve
A one-way valve on the main drain line lets wastewater leave but blocks it from flowing back in. Installation typically requires a plumber and permit.
Lateral inspection
A camera inspection shows roots, sags and breaks in the private line.
Watch what goes down the drain
No grease, wipes or feminine products.
Ejector pump maintenance
Basement bathrooms with ejector pumps need periodic service.
After a sewage cleanup, post-cleanup clearance sampling confirms the area is safe to rebuild.
Costs
| Scope | Typical cost |
|---|---|
| Sewage cleanup per square foot | $7 – $13 / sq ft |
| Small backup (bathroom or utility room) | $1,500 – $4,000 |
| Category 3 flooded basement (national benchmark) | $7,000 – $15,000 |
| Large finished basement | $5,000 – $15,000+ |
| Backwater valve installation (plumber) | $800 – $2,500 |
Sewage-damaged basements are prime mold territory once the area is wet; ask about basement mold remediation after a backup.
Frequently Asked Questions
What should I do first after a sewage backup?
Stop using water in the house, keep people and pets out, shut off power to the area from a dry spot, and call a plumber and a cleanup company.
Is a sewage backup in my basement dangerous?
Yes. Sewage contains bacteria and viruses. Keep vulnerable people out and avoid touching it without protective gear.
Can carpet be saved after a sewage backup?
No. The IICRC treats sewage as Category 3; carpet and pad it touched should be removed and discarded.
Does homeowners insurance cover a sewer backup?
Often only with a water-backup endorsement. Check your declarations page and call your agent before permanent repairs.
Who pays for a sewer backup in Utah?
It depends on where the blockage was and your insurance. The city may be responsible for main-line blockages; the homeowner usually for the private lateral.