How Do I Know If My Main Sewer Line Is Collapsing?

A damaged or collapsing sewer line is one of the most serious plumbing issues a home can face. Catching the warning signs early can prevent costly repairs, property damage, and health hazards.

What Is the Main Sewer Line?

The main sewer line is the pipe that carries all wastewater from your home, sinks, toilets, showers, and appliances, out to the city sewer system or septic connection.

When this pipe begins to collapse, wastewater can no longer flow properly, causing problems throughout the entire home.

Common Signs Your Main Sewer Line Is Starting to Collapse

Frequent Drain Backups

If multiple drains are backing up at the same time, especially toilets and showers, it’s often a sign of a major sewer line issue rather than a simple clog.

Slow Drains Throughout the House

One slow drain can be minor. Several slow drains across the home usually point to damage or obstruction in the main sewer line.

Sewage Smells Inside or Outside

A collapsing sewer line can allow sewage gases to escape.

You may notice:

• Strong sewer odors indoors

• Smells coming from the yard or near cleanouts

These smells should never be ignored.

Gurgling Noises From Drains or Toilets

Air trapped in a damaged sewer line can cause bubbling or gurgling sounds when water is used. This is often an early warning sign of structural failure.

Wet Spots or Sinkholes in the Yard

When a sewer line collapses underground, wastewater can leak into the soil.

Warning signs outside include:

• Soft or soggy areas in the yard

• Unexpected patches of greener grass

• Small sinkholes are forming above the pipe

Repeated Clogs That Keep Coming Back

If clogs return quickly even after professional drain cleaning, the pipe may be cracked, offset, or collapsing rather than simply blocked.

What Causes a Sewer Line to Collapse?

Aging Pipes

Older homes often have sewer lines made of clay, cast iron, or Orangeburg, which deteriorate over time.

Tree Root Intrusion

Tree roots seek moisture and can break into sewer lines, causing cracks and eventual collapse.

Soil Shifting or Ground Movement

Arizona’s soil conditions and temperature changes can cause pipes to shift, crack, or collapse.

Heavy Loads Above the Pipe

Driveways, vehicles, or construction above sewer lines can put pressure on aging pipes.

Why a Collapsing Sewer Line Is Serious

Ignoring the problem can lead to:

• Sewage backups inside the home

• Foundation damage

• Health risks from bacteria and mold

• Much higher repair costs

Early detection makes a major difference.

How Plumbers Diagnose Sewer Line Collapse

Video Camera Line Inspection

Plumbers use specialized cameras to inspect the inside of the sewer line and identify:

• Cracks

• Collapses

• Root intrusion

• Pipe separation

This allows accurate diagnosis without unnecessary digging.

Repair Options for a Collapsing Sewer Line

Traditional Sewer Line Repair

In severe cases, damaged sections of pipe may need to be replaced through excavation.

Trenchless Sewer Repair

When possible, trenchless methods allow plumbers to repair or replace the pipe with minimal disruption to your yard.

When Should You Call a Plumber?

Call a professional plumber immediately if you experience:

• Repeated sewer backups

• Sewage odors

• Yard sinkholes or wet spots

• Multiple drains failing at once

Delaying repairs can turn a manageable issue into a major emergency.

Routine inspections and quick action are the best ways to prevent severe sewer damage and restore proper plumbing flow.

Call Vertical Plumbing at (480) 577-8720