The average sewer line repair costs $2,500-$4,000.
A complete sewer line replacement? That can run $10,000-$25,000 or more.
But here’s what most Chattanooga homeowners don’t realize: the difference between a minor repair and a major replacement often comes down to catching problems early.
Sewer lines don’t fail overnight. They send warning signs for months—sometimes years—before catastrophic failure. The homeowners who pay attention save thousands. Those who ignore the signs end up with sewage in their basement and a five-figure bill.
This guide will teach you exactly what to look for, what causes sewer line damage, and when it’s time to call a professional.
Warning Signs Inside Your Home
Multiple Slow Drains
When one drain is slow, it’s usually a localized clog. But when multiple drains throughout your home are slow simultaneously, the problem is likely in your main sewer line.
Pay attention if your:
- Kitchen sink drains slowly
- Bathroom sinks take longer to empty
- Shower water pools around your feet
- Washing machine drains slowly
Gurgling Sounds
Strange gurgling or bubbling sounds from your drains—especially when you’re not using water—indicate air is trapped in your plumbing. This often happens when a sewer line blockage forces air back through the system.
Listen for gurgling when:
- Flushing the toilet
- Running the washing machine
- Using the dishwasher
Sewage Backups
The most obvious sign of sewer line trouble. If sewage is coming up through floor drains, toilets, or tubs, you have a serious blockage that needs immediate attention.
Foul Odors
You should never smell sewage inside your home. If you do, it could mean:
- A dried-out P-trap (easy fix—run water)
- A cracked or broken sewer pipe
- A failing wax ring on a toilet
- A blocked vent pipe
Warning Signs Outside Your Home
Soggy Spots in Your Yard
Unexplained wet areas in your yard, especially along the path of your sewer line, suggest a leak. The escaping wastewater saturates the soil.
Unusually Green Grass
While lush grass sounds nice, a strip of extra-green, fast-growing grass over your sewer line indicates it’s being “fertilized” by leaking sewage.
Sinkholes or Depressions
When a sewer line leaks, the surrounding soil can wash away, creating depressions or sinkholes in your yard. This is a serious sign that requires immediate attention.
Rodent or Insect Problems
Rats and insects are attracted to sewer line breaks. If you’re suddenly dealing with pest problems, a damaged sewer line could be the cause.
Common Causes of Sewer Line Damage
Understanding what causes sewer problems can help you prevent them:
Tree Root Intrusion
The #1 cause of sewer line damage in Chattanooga. Tree roots seek out moisture and nutrients, and your sewer line provides both. Even tiny cracks allow roots to enter, where they grow and eventually block or break the pipe.
Aging Pipes
Older homes may have sewer lines made of:
- Clay – Common before 1970s, prone to cracking
- Cast iron – Corrodes over time
- Orangeburg – Tar paper pipes that deteriorate quickly
These materials have limited lifespans and may need replacement.
Ground Shifting
Tennessee’s clay soil expands and contracts with moisture changes. This movement can:
- Separate pipe joints
- Crack rigid pipes
- Create “bellies” where waste collects
Grease Buildup
Grease poured down drains doesn’t disappear—it solidifies in your sewer line, gradually restricting flow until complete blockage occurs.
Flushing the Wrong Things
Despite marketing claims, “flushable” wipes don’t break down like toilet paper. They’re a major cause of sewer clogs. Only flush toilet paper and human waste.
When to Call a Professional
Contact a plumber if you notice:
- Multiple slow drains
- Recurring clogs in the same drain
- Sewage odors inside or outside
- Gurgling sounds from drains
- Sewage backup of any kind
- Unexplained wet spots in your yard
- Sudden pest problems
What to Expect from a Sewer Inspection
A professional sewer inspection typically includes:
- Camera inspection – A waterproof camera is fed through your sewer line to visually identify problems
- Location marking – The plumber can pinpoint exactly where issues are located
- Diagnosis – You’ll learn what’s wrong and what caused it
- Options – The plumber will explain repair options and costs
Camera inspections typically cost $100-$300 and can save you thousands by identifying problems before they become emergencies.
Prevention Tips
- Don’t plant trees near sewer lines – Keep large trees at least 10 feet away
- Dispose of grease properly – Let it cool and throw it in the trash
- Only flush appropriate items – Toilet paper and human waste only
- Schedule periodic inspections – Every 3-5 years, or when buying a home
- Address slow drains promptly – Don’t wait for complete blockages
The Cost of Ignoring Warning Signs
Catching sewer problems early saves money:
| Problem Stage | Typical Cost |
|---|---|
| Cleaning/snaking | $150-$500 |
| Spot repair | $500-$2,000 |
| Trenchless repair | $3,000-$12,000 |
| Full replacement | $5,000-$20,000+ |
A $200 camera inspection that catches a problem early could save you $15,000+ in emergency replacement costs.
Concerned about your sewer line? Find local Chattanooga plumbers who offer sewer camera inspections and repair services. Find Sewer Line Experts →