What Are the Signs of a Damaged Sewer Line?

Written by Steven Shipler, Texas Licensed Master Plumber, Responsible Master Plumber (RMP), MBA.

One of the most expensive plumbing problems a homeowner can face is a damaged sewer line. The challenge is that most sewer pipes are buried underground, making it difficult to see problems until symptoms begin appearing inside the home or around the property.

Fortunately, sewer lines often give warning signs before a complete failure occurs.

If you recognize these signs early, a sewer camera inspection may help identify the problem before it becomes a major repair.

1. Slow Drains Throughout the House

One slow drain by itself may simply be a local blockage.

However, when multiple fixtures throughout the home begin draining slowly, the problem may be located in the main sewer line.

Common symptoms include:

• Slow toilets
• Slow bathtubs
• Slow showers
• Slow bathroom sinks
• Slow kitchen sinks
• Water draining unusually slowly after flushing

A sewer camera inspection can determine whether the restriction is being caused by roots, grease buildup, a sewer belly, a separation, or another underground defect.

2. Recurring Sewer Backups

One of the clearest signs of a damaged sewer line is a recurring backup.

If the drain has been cleaned several times but the problem keeps returning, the blockage may only be a symptom of a larger issue.

Common causes include:

• Tree roots
• Broken pipe
• Pipe separation
• Sewer belly
• Collapsed pipe
• Heavy grease buildup
• Improper slope

3. Sewer Odors Inside or Outside the Home

Sewer odors are never normal.

A damaged sewer line may allow sewer gases to escape through cracks, broken joints, separations, or deteriorated pipe sections.

You may notice odors:

• Near bathrooms
• Near floor drains
• In the yard
• Near cleanouts
• Around the foundation
• Near landscaping beds

Persistent sewer odors should be investigated promptly.

4. Wet Spots in the Yard

A damaged underground sewer pipe can leak wastewater into the surrounding soil.

This may create:

• Wet areas in the yard
• Soft soil
• Muddy patches
• Standing water
• Sinking ground
• Areas that remain wet long after rain

These symptoms may indicate a broken sewer line, pipe separation, or collapse.

5. Unusually Green Grass

When wastewater escapes from a damaged sewer line, it can act as fertilizer.

Many homeowners first notice:

• Bright green grass
• Fast-growing vegetation
• One section of lawn growing differently than surrounding areas
• Unusual plant growth above the sewer route

While healthy grass may seem like a good thing, it can sometimes indicate a hidden sewer leak underground.

6. Foundation Movement or Soil Changes

A leaking sewer line can affect the soil around and beneath a structure.

In North Texas, expansive clay soils are already prone to movement. Additional moisture from a leaking sewer line can contribute to:

• Foundation movement
• Cracks in walls
• Floor movement
• Door alignment issues
• Window sticking
• Settlement concerns

Not every foundation problem is caused by a sewer leak, but a sewer camera inspection can help rule out the sewer system as a contributing factor.

7. Gurgling Toilets and Drains

Gurgling sounds often indicate trapped air in the drainage system.

This can occur when wastewater cannot move freely because of a restriction or damaged sewer line.

Common examples include:

• Toilet bubbles when another fixture drains
• Bathtub gurgles when flushing a toilet
• Sink gurgles after running water
• Random bubbling sounds from drains

8. Frequent Drain Cleaning Calls

If you find yourself repeatedly calling for drain cleaning service, it may be time to investigate the sewer line.

A camera inspection may reveal:

• Root intrusion
• Pipe offsets
• Pipe separations
• Sewer bellies
• Collapsed pipe sections
• Heavy grease accumulation
• Deteriorated cast iron pipe

9. Signs of a Damaged Cast Iron Sewer Line

Many older North Dallas homes contain cast iron sewer piping.

Common signs of cast iron deterioration include:

• Recurring backups
• Rust-colored debris
• Slow drainage
• Bad odors
• Frequent drain cleaning
• Floor moisture
• Under-slab leaks

A sewer camera inspection can help evaluate the condition of aging cast iron pipe.

10. Signs of Tree Root Intrusion

Tree roots are one of the most common causes of sewer line damage.

Signs may include:

• Repeated backups
• Slow drainage
• Gurgling fixtures
• Seasonal drain problems
• Older clay sewer lines
• Large trees near the sewer path

North Dallas Areas Where Sewer Problems Are Common

The Sewer Inspection Company serves homeowners, buyers, Realtors, and investors throughout:

• North Dallas
• Plano
• McKinney
• Frisco
• Allen
• Richardson
• Addison
• Carrollton
• Farmers Branch
• Coppell
• Lake Highlands
• Preston Hollow
• Highland Park
• University Park
• Lewisville
• The Colony

Professional Equipment Used During Sewer Inspections

• RIDGID SeeSnake Camera System – High-definition sewer camera inspections.
• RIDGID SeekTech SR-20 Locator – Locates underground sewer lines and defects.
• RIDGID ST-305 Transmitter – Helps trace and locate underground sewer systems.

What The Sewer Inspection Company Provides

• Sewer camera inspections
• Narrated YouTube videos
• Master Plumber review
• Written inspection reports
• Defect identification
• Repair guidance
• Home buyer sewer inspections
• Investor sewer inspections

Final Answer: What Are the Signs of a Damaged Sewer Line?

The most common signs of a damaged sewer line include slow drains, recurring backups, sewer odors, wet spots in the yard, unusually green grass, foundation movement, gurgling fixtures, and repeated drain cleaning problems.

These symptoms may indicate roots, pipe separations, sewer bellies, cracks, offsets, cast iron deterioration, grease buildup, or collapsed sewer pipe sections.

The only reliable way to know what is happening underground is with a professional sewer camera inspection.