Comparison
When should a sewer line be repaired, and when replaced?
Updated · Editorial team; not yet technically reviewed
The verdict
Repair a sewer line when the damage is in one place and the rest of the pipe is sound: a single cracked section, one root-intruded joint or one belly. Replace it when the camera shows damage along much of the line, the material is failing everywhere (Orangeburg, badly corroded cast iron, collapsing clay), or repairs keep stacking up.
Repair or replace: side by side
| Camera shows | Usually | Why |
|---|---|---|
| One crack, offset joint or root entry point | Spot repair or a short liner | The rest of the line has years left |
| Roots at several joints in clay pipe | Lining or replacement | Each joint is a future entry point |
| Belly (sag) holding water | Dig and re-grade that section | Lining follows the sag, so it can't fix slope |
| Orangeburg (fiber) pipe | Replacement | The material deforms and fails along its length |
| Cast iron scaled and cracked along the bottom | Lining or replacement | Depends on whether the pipe holds its shape |
| Collapsed section | Excavation at the collapse; often replacement | Nothing can pass to line it |
Why the camera inspection decides it
A sewer camera inspection records the pipe's material, every defect and its distance from the cleanout. Ask for the video and a written summary. A second opinion on a replacement quote is reasonable, and the video makes that easy.
Methods
- Spot repair: excavate at the defect and replace that section. See sewer line repair.
- Lining (CIPP): a resin liner cures inside the old pipe, sealing cracks and joints without a trench. See trenchless sewer repair.
- Pipe bursting: a new pipe is pulled through as the old one is split apart, with pits only at each end.
- Open-trench replacement: dig and replace the whole lateral; still the right answer for bad slope or very shallow lines. See sewer line replacement.
Common questions
How long does a sewer line last?
It depends on the material and soil. Clay and cast iron can last many decades, while Orangeburg pipe from the mid-1900s often fails sooner. Roots and ground movement shorten any pipe's life.
Who owns the sewer line?
In most places the homeowner owns the lateral from the house to the city main or the property line; rules vary by city.
General information; codes vary by location. See our editorial standards.