Longmont · Boulder County
Basement Sewer Backup in Longmont, CO
Longmont homes near the St.
First: Stop all water use in the house: no flushing, showers, laundry or dishwasher. Keep everyone out of the basement.
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Longmont basement sewer backup: call now
(833) 615-1180Do this first
Stop all water use in the house: no flushing, showers, laundry or dishwasher. Keep everyone out of the basement.
Call right away if: a frozen pipe that has split or is dripping as it thaws; water coming through a basement ceiling or wall; sewage backing up through a basement floor drain.
Pick what's happening in your Longmont home
Sewage in the basement
Do now
- Tell everyone in the house: no showers, laundry, dishwasher or flushing until the line is clear.
- Keep kids and pets out of the basement.
- Note where the sewer cleanout is for the plumber.
Avoid
- Skip the chemical drain opener: it won't clear a main-line block and it burns whoever snakes the line next.
- Every flush upstairs adds more water to the basement.
Call: Right away: sewage at a floor drain means the main line is blocked.
Full step-by-step guideLocal conditions
Basement Sewer Backup in Longmont: what's different here
Longmont homes near the St. Vrain Creek and in low-lying areas can see basement sewer backups during heavy storms, and the 2013 flood left many homes with repaired or replaced sewer lines.
Backwater valves on the sewer line can prevent sewage from flowing into the basement when the main is surcharged. Older homes often don't have one.
After a backup, clean-up and disinfection matter; a camera inspection shows whether the cause was the city main, roots or a damaged lateral.
If it happens in Longmont: the likely cause and the first move
- 1. Local condition
37% of Longmont homes were built before 1980.
- 2. Risk to the home
Older laterals and basement floor drains are where backups show up.
- 3. What goes wrong
Sewage coming up the basement drain.
- 4. What to do
Stop using water and call; a camera inspection afterwards shows the cause.
Housing figures: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, Longmont, CO.
Basement Sewer Backup: the full guide
More on basement sewer backup: signs, steps and costs.
Basement Sewer Backup questions from Longmont homeowners
Can a backwater valve stop basement backups?
It can prevent backflow from the main when properly installed and maintained.
Who is responsible for a Longmont sewer backup?
It depends on where the blockage was; the camera inspection shows it.
Is backup damage covered by insurance?
Often only with a sewer backup endorsement; check your policy.
Service area
Basement Sewer Backup near Longmont
Related
Other Longmont services
Sewer Camera Inspection
A sewer camera inspection runs a waterproof camera through the main sewer line from a cleanout to the city main, recording roots, cracks, offsets, bellies and material changes, and locating problems by depth and position.
Learn more
Sewer Line Repair & Replacement
Sewer line repair fixes a damaged section of the main sewer line, while replacement renews the whole line.
Learn moreHydro-Jetting
Hydro-jetting sends high-pressure water through a drain or sewer line to scour grease, scale, sludge and fine roots off the pipe walls.
Learn more
Need basement sewer backup in Longmont?
Roots, grease, collapsed pipe or city main surcharges.