What is pipe bursting?
Pipe bursting replaces an old sewer pipe by breaking it apart underground and pulling a new pipe into the same space. It needs a launch pit at one end and a receiving pit at the other, not a trench along the full length.
The method exists for the cases lining cannot handle. A liner needs a host pipe that holds its shape; a crushed, flattened or badly broken pipe gives it nothing to form against. Bursting does not care about the old pipe's condition, because the old pipe is destroyed in the process and pushed into the surrounding soil.
The replacement is usually high-density polyethylene, fused into one continuous length with no joints. Bursting can also upsize the line, for example when an older home has added bathrooms and the original pipe is undersized for the load.
How does pipe bursting work?
Pits at each end
The contractor digs a launch pit at one end of the section being replaced and a receiving pit at the other. Often one pit is near the house and the other near the property line or at the connection to the main.
Threading the cable or rods
A steel cable or a string of rods is pushed through the old pipe from the receiving pit to the launch pit. If the old pipe is blocked, it is cleared first enough to pass the cable.
The bursting head
A cone-shaped head, larger than the old pipe, is attached to the cable. Behind it, the new pipe is connected. A hydraulic puller or a pneumatic hammer drives the head through the line. The cone fractures the old pipe and pushes the fragments outward into the soil, opening a channel the new pipe follows.
Connections
The new pipe is connected to the house drain and to the main or the remaining lateral with approved couplings. The line is filmed, inspected where a permit applies, and the pits are backfilled.
Which signs suggest bursting rather than lining?
- The camera stops at a collapse and cannot pass.
- The pipe is flattened or oval, a typical sign of bituminous fiber pipe.
- Large sections are missing, with soil visible where the pipe wall should be.
- Repeated backups happen even right after cleaning.
- The house has outgrown its pipe after additions or extra bathrooms.
- Multiple severe offsets block the path a liner would need.
- Sinkholes or depressions appear over the line where soil is washing into it.
- A failed earlier repair left a patchwork of materials along the run.
What causes the kind of failure bursting fixes?
- Material failure. Bituminous fiber pipe, used in some mid-century construction, softens and deforms. Thin-walled cast iron can rot through along the bottom.
- Root pressure. Large roots growing at a joint can split clay pipe.
- Soil movement. Settling fill and shifting ground crush or separate rigid pipe.
- Surface loads. Heavy vehicles over a shallow pipe, such as during construction, can crack it.
Bursting has limits of its own. It needs a reasonably straight run between pits, since tight bends stop the head. It also displaces soil, so pipes, cables or foundations running very close to the old line need to be identified first.
What can you check before a bursting estimate?
- Call 811 or let the contractor arrange utility marking; other buried lines near the sewer must be located before bursting.
- Note any additions, extra bathrooms or ADUs that changed the load on the line.
- Identify where pits could go with the least restoration: lawn and planting beds over driveways.
- Gather any past camera footage, especially if a previous camera could not pass a section.
WarningNever dig to expose a sewer line yourself without utilities being marked. Gas, power and water lines are often buried in the same corridor.
How does a pipe bursting job proceed?
- Camera survey to find the failed section and confirm the run is straight enough.
- Utility marking of nearby buried lines.
- Permit from Rancho Palos Verdes Building & Safety for the replacement.
- Pit excavation at launch and receiving points.
- Pipe fusion of the new HDPE into one length, if that material is used.
- Bursting pull of the head and new pipe through the old line.
- Connections at both ends, then a camera pass through the new pipe.
- Inspection, backfill and surface restoration.
What affects pipe bursting cost?
| Factor | How it changes the job |
|---|---|
| Run length | Longer runs need more pipe and more pulling capacity. |
| Depth | Deeper pipe means deeper pits and possibly shoring. |
| Pit locations | Pits in hardscape cost more to open and restore than pits in soil. |
| Upsizing | A larger new pipe needs a larger head and more force. |
| Nearby utilities | Close gas or water lines may need protection or exposure. |
| Street connection | Connecting at the main under the street adds approvals and traffic control. |
What if the pipe collapsed suddenly?
A full collapse means water cannot leave the house at all. Stop using water and call. A contractor may be able to clear a path through a partial collapse to restore temporary flow. If not, a spot excavation at the collapse can reopen the line, and bursting or another method replaces the remaining run once it is filmed and planned.
Keep the camera footage from the emergency visit. It records the collapse point and the condition of the pipe on both sides of it, which is exactly what a bursting contractor needs to plan pit locations and choose the size of the replacement pipe.
Pipe bursting FAQs
Can pipe bursting be used on Rancho Palos Verdes hillside lots?
Yes, where the run between pits is reasonably straight. Slope itself is not a barrier, but bends and very deep sections may change the plan.
Is HDPE pipe allowed for sewer laterals?
HDPE is widely used for bursting. Your contractor should confirm the material meets the plumbing code adopted by the City and note it on the permit.
Does bursting damage nearby pipes or foundations?
The process pushes soil outward, so buried utilities and structures close to the old pipe must be located first. Experienced crews plan clearance before pulling.
How long does pipe bursting take?
Many residential laterals are replaced in a day or two, plus time for the permit and inspection.
Bursting or lining: which is better?
Neither is better in general. Lining suits pipe that holds its shape; bursting suits pipe that has collapsed, deformed or is too small.
Can bursting replace the part of the lateral under the street?
Often, with a pit at the main connection. Work in the public right-of-way may need additional approval beyond the plumbing permit.
What should you ask a pipe bursting contractor?
Bursting is powerful equipment working underground near other buried lines, so the quality of planning matters as much as the price. Use these questions to see how carefully a contractor has thought through your run, from the pull path to what happens at each pit, and to compare two bids on equal terms.
- Is the run straight enough to burst in one pull? Bends may mean an extra pit or a different method for part of the line.
- What diameter and wall thickness will the new pipe be? Upsizing is a benefit of bursting, but it must suit the house drain and the connection at the main.
- How will you protect nearby utilities and structures? Bursting pushes soil outward. Ask how gas lines, water lines and footings close to the pipe will be located and cleared.
- How are the new pipe ends connected? Transition couplings must suit both the HDPE and the existing pipe or main they join.
- What restoration is included? Backfill, compaction and surface repair at each pit should be written into the scope.
- Who arranges utility marking? 811 marking should be completed before any excavation begins.
How does bursting fit with other repairs?
Bursting is one of the two main trenchless sewer repair methods. If the camera shows the pipe still holds its shape, sewer pipe lining may cost less and need fewer pits. Where the run has a sag or sharp bends, traditional sewer line replacement may be the better route. Visit the Bluffline Sewer Pros homepage for the full picture of sewer repair in the city.
Older homes in West Palos Verdes sometimes have deformed early pipe where bursting is the cleaner fix.
Pipe bursting by neighborhood
Each neighborhood page explains how depth, lot layout and housing era affect a bursting job there.
- Pipe Bursting in Eastview
- Pipe Bursting in Miraleste
- Pipe Bursting in West Palos Verdes
- Pipe Bursting in Los Verdes
- Pipe Bursting in Monaco
- Pipe Bursting in La Cresta
- Pipe Bursting in Del Cerro
- Pipe Bursting in Mesa Palos Verdes
- Pipe Bursting in Mira Catalina
- Pipe Bursting in Ladera Linda
- Pipe Bursting in Crestridge
- Pipe Bursting in Seaview
- Pipe Bursting in Portuguese Bend
- Pipe Bursting in Abalone Cove
- Pipe Bursting in Island View