Signs the pipe itself has failed
A lateral that clogs again within weeks of cleaning, a sinkhole or wet patch in the yard that does not dry, sewer smell near the foundation and repeated backups into the lowest drain all point to a break. So does a camera inspection that shows a gap, offset or collapse.
If sewage is rising in the house now, stop using water and call. Clearing the line comes first, then the camera, then the repair decision. You do not have to decide about digging at 2 a.m.
Repair options and when each fits
There are two broad ways to fix a damaged lateral. Trenchless methods repair the pipe from the inside or pull a new pipe along the old path with little digging. Open-trench replacement removes the old pipe and lays new. Which one fits depends on the damage, the depth, the pipe material and what sits above it.
Trenchless repair
Pipe lining and pipe bursting suit a lateral with continuous damage that has a clear path and working access at both ends. They avoid tearing up landscaping, driveways and patios. They are not a fit for every pipe, such as one with a severe collapse or a large belly.
Spot repair and open trench
If the damage is a single bad section, digging down to replace just that length can be the cheapest path. Open-trench replacement is also the call when the pipe has a belly that holds water and needs regrading.
| Method | Best when | Trade-off |
|---|---|---|
| Spot repair | One damaged section | Needs a dig at that spot |
| Pipe lining | Cracks and root entry along a continuous run | Cannot fix a pipe that has collapsed or has a deep belly |
| Pipe bursting | Old pipe along a clear path | Needs pits at both ends |
| Open-trench replacement | Collapse, belly or multiple failures | Most disruption to the surface |
How a repair decision gets made
- Clear the line. The backup is relieved so the camera has a clean run.
- Inspect on video. A sewer camera inspection shows where the damage is, how deep it sits and how long the bad section runs.
- Compare the options. You see the damage footage and hear the choices with prices side by side.
- Pull the permit if required. The Building Division can tell you the requirements for sewer work. We handle the paperwork that belongs to the plumber.
Repeat backups? Ask for a camera look and a repair price.
Call (650) 860-1670What moves the price of a sewer line repair
- Length of the damaged run. A single bad joint costs far less than the whole lateral.
- Depth and surface above. A lateral under lawn is easier than one under a driveway or patio.
- Method. Lining, bursting and trench replacement each price differently.
- Access pits and restoration. Digging, backfill and surface repair change the total.
- Permit and inspection. Required work may involve a permit fee and a City inspection.
Because the lateral belongs to the property owner, the cost is the owner's. Ask whether your policy or a home warranty plan covers sewer line damage, because some do. Get the price in writing before any dig begins.
Laterals, clay and the 1950s housing stock
Mountain View's sewer system serves homes built over seven decades. Monta Loma's Eichler streets date from the mid-1950s, and Blossom Valley's ranch subdivisions from the 1950s and 1960s. Pipe laid in those years was commonly clay or cast iron, so root intrusion and joint failure are the usual findings when a lateral from that era is scoped.
The City's wastewater FAQ also says the owner is responsible for damage from an improperly constructed lateral, including a missing backflow prevention device. When a lateral is replaced, ask the plumber whether the new work includes the right device and cleanout.
Replacement or relining of a building sewer is plumbing work under the California Plumbing Code, and a licensed plumber with the C-36 plumbing classification from the Contractors State License Board is the person to do it.
Sewer Line Repair questions
Is emergency sewer line repair available at night in Mountain View?
Yes. Call (650) 860-1670 at any hour. A licensed plumber is dispatched to relieve the backup first, then inspect the line. Permanent repair is scheduled once you see the options.
Do I have to dig up my whole yard?
Not always. Trenchless lining or bursting can fix a lateral with little digging if the pipe and path suit it. Severe collapse or a deep belly usually needs open trench.
How do I know the pipe is damaged and not just clogged?
A camera shows it. Repeated clogs after cleaning, wet ground over the pipe and a sewer smell outside are warning signs.
Who is responsible for the lateral, me or the City?
The City's FAQ places the lateral on the property owner. The City handles its own sewer main.
Will the repair need a permit?
Sewer work may require one. Contact the Building Division at 650-903-6313 or building@mountainview.gov, and we handle the plumber's side.