If you've been told your sewer line needs to be replaced, your first reaction is probably to picture your yard torn apart — a backhoe, a long trench, and landscaping in ruins. That's still how some plumbers do it. But most of the time now, there's a better way: trenchless sewer replacement.
What "trenchless" actually means
Trenchless sewer replacement replaces a damaged line without digging a continuous trench from your house to the city connection. Instead, we dig two small access points — one near the house, one near the street — and do the work underground between them.
Your lawn, your driveway, your fence, your mature trees: all stay where they are.
The question most homeowners ask next is: "Which trenchless method is best for my line?" That usually comes down to two choices.
The two main trenchless methods
Pipe bursting — our default for outside-the-house replacement
A new pipe is pulled through the path of the old one while a bursting head breaks the old pipe outward into the surrounding soil. The new pipe ends up exactly where the old one was.
What you get:
- A brand-new, fully structural pipe of continuous HDPE (high-density polyethylene)
- No joints, no couplings, no weak points along the run
- Same or larger diameter than the old line
- Service life of 50-100 years
Pipe lining (cured-in-place pipe, or CIPP) — for specific inside-the-house situations
A flexible liner saturated in resin is inserted into the existing pipe and cured in place, forming a new seamless pipe inside the old one. The old pipe becomes the host for the new liner.
What you get:
- No digging at all (in most cases — still needs access points)
- New smooth inner surface in the old pipe
- Quick turnaround
Why we recommend pipe bursting for most outside-the-house replacements
CIPP has its place — we use it. But for the main sewer line running from the house out to the street, pipe bursting is almost always the better choice. Here's why:
1. CIPP reduces the interior diameter of your pipe. The liner takes up space inside the old pipe. A 4-inch line with a CIPP liner is now effectively a 3.5-inch line (or less, depending on liner thickness). Over decades, that loss of capacity can mean slower flow and more clogs. Pipe bursting replaces with the same diameter — sometimes even upsizes to 6-inch.
2. CIPP requires the host pipe to be structurally intact. If your old pipe is cracked, that's fine — CIPP can handle cracks. But if sections have collapsed, bellied (sagged), or shifted out of alignment, a liner can't fix that. The new pipe inside a bellied pipe is still bellied. Pipe bursting creates an entirely new pipe — the old pipe's structural problems go away with the old pipe.
3. CIPP can't fix offset joints. When two sections of old pipe have shifted so they no longer line up, a CIPP liner will follow that offset. Pipe bursting lays a single continuous line that ignores where the old joints were.
4. Outside-the-house lines see more movement. Ground settlement, tree root pressure, seismic activity, heavy vehicles over buried lines — the outside run takes more abuse than indoor plumbing. HDPE from pipe bursting flexes slightly with ground movement. CIPP is more rigid and can delaminate or crack under stress.
5. Tree roots. HDPE from pipe bursting is effectively root-proof — no joints for roots to invade. CIPP liners resist root intrusion at the points they line, but any unlined connection points (like at the city main or at a side branch) are still vulnerable.
When CIPP is the right call
We do use CIPP, just not usually for outside-the-house main line replacement. It makes sense for:
- Short interior runs — a cracked section under a slab foundation, for example, where any digging would be destructive
- Hard-to-access lines — commercial buildings, multi-story properties, shared lines
- Partial relining — fixing one bad section of a line that's otherwise solid
- When the customer specifically requests it after understanding the trade-offs
When even pipe bursting isn't the answer
Both trenchless methods have limits. Traditional open-trench replacement is sometimes the right call:
- Major bellies requiring re-grading — a bellied pipe needs to be physically raised or replaced with proper slope; neither CIPP nor pipe bursting fixes grade
- Completely collapsed pipe — if we can't thread a cable through the old line, we can't pull a bursting head through it either
- Sharp bends or radical elevation changes — some layouts don't work with bursting equipment
- Local district or municipal rules — occasionally a sanitary district requires open-trench for inspection purposes
Our process
Every replacement job starts the same way: a camera inspection of the full sewer line. We walk you through the footage, explain what we're seeing, and give you a straight recommendation. We'll tell you which method is right — pipe bursting, CIPP, or open-trench — and why. If another method might be cheaper or faster, we'll say so, even if it means we're not doing the job.
If pipe bursting is the call:
- Two small access pits (one at the house, one at the street)
- Work usually wraps in one to two days
- Water service isn't interrupted
- Your yard stays mostly intact
- You get a new pipe good for 50+ years
Not sure if you actually need replacement?
Most of the time, you don't. A camera inspection tells you exactly what's going on down there and whether replacement, spot repair, or just a good cleaning is the right move. Don't let anyone quote you a full replacement without showing you video first.
Schedule a camera inspection or learn more about trenchless replacement. Questions: (925) 371-7500.