Sewer line defects: what each finding means
The defects a sewer camera finds, and how often each one genuinely needs a repair.
The short answer
Most sewer line defects fall into four groups: roots, bellies, cracks and collapses. Roots and shallow bellies are often maintenance problems. Cracks range from something to monitor to something to repair. A collapse is the one finding that almost always needs excavation or bursting. The footage, not the word on the report, decides which.
In this section
From usually fine to always a repair
The same word on an inspection report can describe a routine finding or a failing pipe. This is the rough order of how often each defect genuinely needs work, and the usual response.
| Defect | Usually | Typical response |
|---|---|---|
| Grease or debris | Maintenance | Clean the line; change what goes down the drain |
| Shallow belly | Monitor | Re-inspect; jet if it collects solids |
| Light roots at a joint | Maintenance | Cut roots; re-inspect in one to two years |
| Scale in cast iron | Maintenance | Descale, then re-inspect |
| Minor offset joint | Monitor or repair | Repair if it catches debris or lets soil in |
| Hairline crack | Monitor or seal | Line or spot repair if it is leaking or growing |
| Roots at many joints | Repair | Line the run or replace |
| Deep or long belly with clogs | Repair | Excavate and re-grade the section |
| Separated joint, open crack, channeling | Repair | Spot repair, lining or replacement |
| Orangeburg deformation | Replace | Burst or dig |
| Collapse | Repair now | Excavate or burst the section |
How to decide what a defect needs
Four questions settle most of it. Is it causing problems — clogs, backups, smells — or was it found on a routine inspection? Is it at one spot or along the line? Is the pipe around it still round and sound? And what is the material, since Orangeburg and heavily corroded cast iron make repairs to one section less likely to hold?
A defect that isn't causing problems, at one spot, in sound pipe, is rarely urgent. A defect that is causing problems, repeats along the line, or sits in failing material is where the money should go.
When to get a second opinion
Before agreeing to replace a line on the strength of a defect, get the recording and the distance to each finding, and have a second contractor or an independent inspector look at the same footage. Roots, debris and bellies can all stop a camera and be mistaken for a collapse, and a finding at one joint doesn't justify replacing a hundred feet of pipe.