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Fix a lateral that is collapsed

We'll confirm the symptom, rule out clogs, then guide you to a camera inspection and professional repair.

Troubleshooting · Home maintenance
30 min (diagnosis) + professional repair
What you'll need
  • Drain snake or auger (to rule out clogs)
  • Access to main cleanout
Step 1 of 6

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Quick triage — pick your path

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Steps

Goal: Confirm the symptom, rule out clogs, then schedule a camera inspection and professional repair.

  • Check if toilets, sinks, and showers all back up or drain slowly. When multiple fixtures are affected, the issue is likely in the main line or lateral.
  • Good: Multiple fixtures back up—proceed to Rule out clog.
  • Bad: Only one fixture—try unclogging that drain first, or call a plumber.

Rule out clog

Goal: Confirm a simple clog is not the cause before assuming a collapse.

  • Run a drain snake or auger through the main cleanout toward the sewer. If the snake clears a blockage and drains improve, the issue was a clog.
  • When the snake hits a hard stop or passes through but backups continue, the lateral may be collapsed.
  • Good: Snake cleared the line—clog was the cause. If backups return, schedule a camera inspection.
  • Bad: Snake did not clear—proceed to Camera inspection.

Camera inspection

Goal: Confirm whether the lateral is collapsed, broken, or has root intrusion.

  • A plumber or sewer contractor runs a camera through the lateral. The camera shows collapses, breaks, root intrusion, or offsets.
  • If the lateral is collapsed, the camera will not pass or will show crushed pipe. Repair requires excavation and pipe replacement, or CIPP trenchless relining when feasible.
  • Good: You have an inspection report. Get repair quotes from licensed contractors.
  • Bad: Camera shows other issues (roots, offset)—different repair approach; the plumber will advise.

When to get help

Call a plumber or sewer contractor for:

  • Any lateral repair—do not attempt to fix a collapsed pipe yourself.
  • Sewage in the yard or basement—call immediately.
  • Backups worsening despite reduced water use.
  • Camera inspection and repair quotes.

Verification

  • Multiple fixtures drain normally after repair.
  • Camera inspection confirms the lateral is intact or repaired.
  • No backups or sewage odor.
  • Repair completed by a licensed plumber or sewer contractor.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm symptom Check if multiple fixtures back up—rules out single-drain clogs.
  2. Rule out clog Snake the main line; if it clears, the issue was a clog.
  3. Camera inspection Plumber runs camera to confirm collapse, break, or roots.
  4. Get repair quotes Excavation or trenchless relining—professional work only.
  5. Call a pro Do not repair a collapsed lateral yourself. Call a plumber or sewer contractor.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Which fixtures back up
  • Snake result (cleared or hard stop)
  • Camera inspection report or video
  • Repair quotes received

Do multiple fixtures back up or drain slowly?

Check toilets, sinks, and showers. Single-fixture issues suggest a local clog.

Check if toilets, sinks, and showers all back up or drain slowly. Good: multiple fixtures affected—likely main line or lateral. Bad: only one fixture—try unclogging that drain first.

Yes No

You can change your answer later.

Does snaking the main line clear the blockage?

Run a drain snake through the main cleanout. If it clears, the issue was a clog.

Run a drain snake or auger through the main cleanout toward the sewer. Cleared: drains improve—clog was the cause. Hard stop or no improvement: lateral may be collapsed—schedule camera inspection.

Yes (cleared) No

You can change your answer later.

Drains improved

The clog was cleared. If backups return, the lateral may have roots or damage—schedule a camera inspection.

Done

Does the camera inspection show a collapse?

A plumber runs a camera through the lateral. Collapse, break, or severe root intrusion requires repair.

Schedule a camera inspection with a plumber or sewer contractor. Collapse or break: excavation or trenchless relining needed—get quotes. Roots or offset: may be repairable without full replacement. Do not attempt repair yourself.

Yes No (other issue)

You can change your answer later.

Schedule professional repair

Get at least two quotes for excavation and pipe replacement or trenchless relining. Reduce water use until repair. Call a plumber or sewer contractor—do not attempt repair yourself.

Done

Call a plumber

Call a plumber or sewer contractor if: only one fixture backs up (may need different fix), camera shows roots or offset (different repair), or you need repair quotes. Do not attempt lateral repair yourself.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

What causes a sewer lateral to collapse?
Age, tree roots, ground shifting, heavy vehicles over the pipe, or poor installation. Clay and Orangeburg pipe are especially prone to collapse over time.
Can I fix a collapsed lateral myself?
No. Repair requires excavation and pipe replacement or trenchless relining. Both need a licensed plumber or sewer contractor. You can rule out clogs with a snake, but the actual repair is professional work.
How do I know if my lateral is collapsed vs clogged?
A camera inspection is the only way to confirm. If a snake passes through but backups continue, or the snake hits a hard stop, a camera will show whether it is a collapse, break, or root intrusion.
When should I call a plumber for a lateral?
Call a plumber if: multiple fixtures back up, snaking does not resolve the issue, you see sewage in the yard or basement, or a camera inspection shows a collapse or break. Do not delay—backups can cause health hazards.

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