Trenchless sewer replacement in Los Angeles without trenching the whole yard

Pipe bursting replaces the old pipe with a brand new one. We open a pit near the house and another near the property line, feed a steel cable through the old line, and pull a cone-shaped bursting head back through it. The head fractures clay or cast iron outward into the soil while a continuous length of fused HDPE pipe follows right behind. The result is a jointless pipe the same size as the original or one size larger.

A cured-in-place liner builds a new pipe inside the old one. A felt or fiberglass tube soaked in epoxy is inverted into the cleaned host pipe and held against the walls with air or water pressure until it hardens. It suits lines where bursting is risky, such as pipes running close to a foundation footing, a gas line or a neighbor's wall, and lines with several bends.

Neither method fixes a pipe with the wrong slope. If the camera shows a long belly, we may combine trenchless work with a short open dig to correct the grade in that stretch.

The main reason people choose trenchless in Los Angeles is what sits on top of the pipe. Many laterals run under a driveway, a front walk, a mature parkway tree or a lawn with irrigation lines and plantings. A conventional replacement would cut all of that in a straight line to the street.

With bursting, the disturbance is two pits, each a few feet square. Lining can sometimes be done from an existing cleanout with no pit at all. Concrete is cut only where a pit lands, and roots near the line are cut flush rather than the tree being disturbed.

• Driveways and stamped concrete stay in place
• Mature trees keep their root zone mostly intact
• Irrigation and landscape lighting avoid the trench
• Front walks and steps remain usable during the job

Bursting needs room for the old pipe to break outward. Lines that run within a few inches of another utility, or under a slab that could crack from the expansion, are better lined or dug. We check depth and nearby lines before choosing a method, and we request underground utility marking so gas and water lines are located first.

A line that has fully collapsed in several places can stop a liner from going in, and a fully crushed section can stop a bursting head. Severe offsets from ground movement sometimes need an open dig at that point. In those cases we explain why and price a hybrid: trenchless for most of the run plus a short open section where the pipe is too far gone. If only one spot is bad, a targeted sewer repair is usually the cheaper answer.

The new pipe has to tie into something at each end. At the house, we connect to the building drain at or just outside the foundation, and this is the best moment to add a two-way cleanout so future cleaning never needs a ladder on the roof vent. At the street end, the new line joins the existing lateral near the property line or at the city sewer connection, depending on where the damage stops.

If the old lateral carries waste from an ADU or a garage conversion as well, we size the new pipe for that combined load. Planning the backyard unit's drain now avoids a second dig later, which our guide to ADU plumbing planning covers in more detail.