Sewage backup cleanup in Denver is a different kind of water loss from a burst pipe or a rain leak, because the water is contaminated and the hazards are biological. If sewage is coming up through a basement floor drain, a tub, or a toilet, call (303) 951-9176 to get connected with local help, and read the safety steps below while you wait.
Why Sewage Is Different
The restoration industry classifies sewage as black water, the most contaminated category. It can carry bacteria, viruses, parasites, and other organisms that can make people ill. That is why sewage jobs are not handled like clean-water jobs: crews wear protective equipment, porous materials that touched the sewage are generally removed rather than dried, and surfaces are cleaned and sanitized as well as dried. Attempting to mop up sewage with household towels and disinfectant usually spreads contamination and leaves it in the materials.
Why Sewer Lines Back Up in Denver
Denver sewage backups most often start in the line that runs from the house to the main sewer in the street. Many central Denver neighborhoods were built decades ago with clay tile sewer lines, and tree roots can push into the joints and block the line. Expansive clay soil that shifts with moisture can also stress or crack older pipes. Grease, wipes, and other debris add to blockages, and in some storms an overloaded system can push water back toward low points. Because a basement floor drain is usually the lowest opening in the plumbing system, it is where a backup shows up first.
Early Warning Signs
- Slow drains in several fixtures at once, not just one
- Gurgling sounds from toilets or floor drains when water runs elsewhere
- Toilets that bubble or rise when the washing machine drains
- Sewage odor in the basement
- Water backing up into a basement floor drain or shower
If you see these signs, stop using water and call a plumber. A sewer camera inspection can show whether roots or a damaged pipe are the cause. Fixing the line is a plumber’s job. Cleanup and restoration handle what the sewage touched.
What to Do in the First Minutes
- Stop using water in the house so more does not go down the line.
- Keep people and pets out of the affected area, and wear boots, gloves, and eye protection if you must enter.
- Stay away from the electrical panel and outlets if the water is deep, and do not run vacuums or fans in the wet area.
- Photograph the source and the damage before moving anything.
- Call a plumber for the line and call for sewage cleanup so contamination does not spread further.
- Call your insurer and ask about sewer backup coverage.
How Sewage Cleanup Works
Assess and contain
The extent of contamination is judged and the area is isolated so it does not spread to clean parts of the home.
Remove contaminated water
Sewage and standing water are pumped out with protective equipment.
Remove porous materials
Carpet, padding, insulation, and drywall that touched sewage are removed and disposed of properly.
Clean and sanitize
Concrete, framing, and remaining surfaces are cleaned, disinfected, and treated for odor.
Dry and confirm
The structure is dried and readings confirm the result. See mitigation and drying.
Rebuild
Removed materials are replaced. See water damage repair.
What Can and Cannot Be Saved
| Item | Typical Outcome After Sewage |
|---|---|
| Carpet and padding | Removed and discarded |
| Drywall and insulation | Removed where contacted or wicked |
| Concrete floors and walls | Cleaned and disinfected |
| Wood framing | Cleaned, sanitized, and dried |
| Mattresses, upholstered furniture, stuffed items | Generally discarded |
| Hard items such as metal, glass, and plastic | Often cleanable and sanitizable |
| Paper, books, and cardboard | Usually discarded |
Apartments, Condos, and Shared Lines
In a multi-unit building, a sewage backup often starts in a shared line, and the lowest unit takes the worst of it. Notify the property manager or association immediately, since they control access to the shared plumbing and to the plumber who can clear it. Renters should report the backup in writing, photograph belongings and damage, and keep receipts for emergency lodging and cleaning. Whether a landlord, an association, or a tenant’s own policy pays depends on the source and the documents, so ask early and keep copies of everything.
Odor After Cleanup
Sewage odor can linger in porous materials, concrete, and air ducts even after visible cleanup. Removing contaminated materials, thorough cleaning, and drying are what actually eliminate odor. Masking it with fragrance does not. If a smell persists, something contaminated is probably still in place, such as padding under flooring, insulation in a wall, or a spot of soaked drywall behind a baseboard. Ask that odor be checked again before rebuilding closes everything up.
Protecting Health During and After
Sewage exposure is a health matter, not just a cleanup one. Avoid skin contact, keep hands away from your face, wash thoroughly after any exposure, and keep food and dishes away from the affected area. Children, older adults, pregnant people, and anyone with a weakened immune system should stay elsewhere during cleanup where possible. If anyone develops stomach illness, fever, or skin infection after exposure, contact a medical provider.
Who Is Responsible for the Sewer Line?
In many cities, the owner is responsible for the service line that runs from the building to the main in the street, while the city is responsible for the main itself. Details vary by property, and a blockage in the city main is a different situation from one in your own line. If you are not sure where the blockage is, a plumber’s camera inspection can help locate it, and the City and County of Denver’s wastewater staff can advise on the public system. Keep records of everything, since they matter for insurance.
Insurance and Sewage Backup
Sewer or drain backup is a common gap. Standard homeowners policies often exclude it unless an endorsement has been added, and the endorsement is usually not included by default. Some policies set a low limit for backup coverage. Read your policy now, and after a loss, tell your insurer right away, keep photos and receipts, and ask what they require for documentation and for removed materials.
Preventing a Backup
- Have older lines scoped with a camera, especially in homes from before about 1960 or if drains are slow
- Do not pour grease down drains, and do not flush wipes, even ones labeled flushable
- Ask a plumber about a backwater valve, which can help stop sewage from flowing back into the house
- Keep tree roots in mind when planting near the sewer line
- Confirm that your policy includes a sewer backup endorsement
What Affects the Cost
Cost depends on the amount of contaminated material to remove, the size of the area, whether finished basement materials are involved, and how much rebuilding follows. Sewage work is more intensive than clean-water work because of the protection, removal, and sanitizing involved. Scope and pricing are discussed before work begins.
Sewage Cleanup Across Denver
Sewage backup cleanup is available across Denver, including Park Hill, Capitol Hill, Washington Park, the Highlands, and Central Park. For groundwater and storm water, see basement flooding and flood restoration, or return to the overview of water damage restoration in Denver.