Why this happens more as neighborhoods age
Each house connects to the public sewer main through a private service line, often called a lateral. In many homes of this era the lateral is plastic pipe with joints that roots can work into over decades. Thirty-year-old trees put out roots that seek moisture, and a small gap at a joint is enough. Roots then catch wipes, grease and paper until the line slows or stops.
Because the basement floor drain is usually the lowest opening in the house, it overflows first. Owners often notice a gurgle in a lower toilet, a slow basement shower, or water around the floor drain after laundry runs.
How a backup typically develops
- Months before
- Occasional gurgling, a lower toilet that drains slowly, a faint sewer smell near the floor drain.
- Weeks before
- Laundry or a long shower leaves water standing at the floor drain for a while.
- The day of
- A large discharge, such as a washer cycle or several showers, has nowhere to go and rises out of the floor drain.
- First hours after
- Stop using water, call a drain service to clear the line, and keep people away from the affected area.
- Following days
- Contaminated porous materials removed, surfaces cleaned and disinfected, structure dried and readings logged.
Who handles which part
| Part of the system | Usually responsible | Who to contact |
|---|---|---|
| Drains inside the house | Owner | Plumber or drain service |
| Service lateral to the main | Usually owner, sometimes shared rules | Plumber; ask your sanitation district where responsibility changes |
| Public sewer main | Sanitation district | The district's emergency line if the main is blocked |
| Cleanup of the basement | Owner, often with insurance help | A restoration contractor who handles contaminated water |
Questions to ask after a backup
- Did the drain service run a camera, and can I get the video showing the cause?
- Is the blockage in my line or in the public main?
- Does my homeowners policy include a sewer or drain backup endorsement, and what is its limit?
- Which basement materials will be removed because of contamination, and which can be cleaned?
- Would a backwater valve make sense for this house, and does installing one need a permit?
Common questions
- Is sewer backup covered by a standard homeowners policy?
- Often only with a specific endorsement, usually with its own limit. Check your declarations page or ask your agent before you need it.
General information for Highlands Ranch, not a quote or professional advice. In an emergency, call 911.