Diagnosis

How to read a sewer camera inspection

Roots, bellies, offsets, cracks, and grease—what common defects look like on a drain camera screen.

Updated 2026-11-0515 min readCustomer buying guide
Drain camera view inside a pipe showing a joint with root intrusion
Drain camera view inside a pipe showing a joint with root intrusion

The camera only helps if you can name what you are seeing. These are the defect patterns homeowners and techs meet most often.

Drain camera view inside a pipe showing a joint with root intrusion
Root intrusion at a joint is one of the most common residential findings—capture distance before you move on.

Common visuals

What you seeLikely meaningTypical next step
Fine roots at jointsIntrusion at loose jointsCleaning + seal / repair plan
Heavy root massChronic intrusionMechanical cut + structural fix discussion
Standing water / “lake”Belly / sag holding waterGrade repair; cleaning alone may return
Offset / stair-step jointMisaligned sectionsRepair; camera can hang here
Cracks / missing wallStructural failureExcavation or trenchless quote
Grease sheen / soft clogFOG buildupJetting / cleaning; habit changes
Collapsed oval pipeCrush / failureStop pushing; repair

Why self-leveling helps interpretation

Bellies and water lines are much easier to judge when the image stays upright. If your kit lacks leveling, use water surface and bubble cues carefully—and say in your notes that orientation may be rotated.

What to do with the footage

  1. Save a short clip of each defect with distance.
  2. Do not claim a repair method you are not qualified to perform.
  3. Send clear video to licensed pros for quotes.
  4. If digging, locate or hire locating—see 512Hz guide.

Common interpretation mistakes

  • Calling every wet spot a belly—confirm a sustained water line while the head is still.
  • Ignoring distance—without footage marks, the clip cannot guide a dig or quote.
  • Overclaiming repair methods—diagnose on camera; let licensed pros prescribe structural fixes.
  • Skipping as-found vs as-left—if you clean after, keep both clips labeled.

Belly vs offset deep dive: belly vs offset. Roots: roots in pipes.

Recording tips: DVR guide. Buying for DIY: homeowner cameras.

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