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Drain & Sewer Issues

Signs Your Sewer Line May Be Collapsing

A collapsing sewer line is a serious problem that gets worse over time. These warning signs can help you catch it before it becomes a catastrophe.

January 28, 20247 min readSouthern MarylandMD Master Plumber

In This Article

  1. 1Multiple Slow Drains Throughout the House
  2. 2Sewage Backups in Multiple Fixtures
  3. 3Sinkholes or Depressions in the Yard
  4. 4Sewage Odors Inside or Outside
  5. 5Rodent or Insect Infestations
  6. 6Age of Your Home

A collapsing sewer line is one of the most expensive plumbing emergencies a homeowner can face — but it rarely happens without warning. The signs are there if you know what to look for. Catching a deteriorating sewer line early can mean the difference between a $3,000 pipe lining and a $15,000+ excavation and replacement.

1

Multiple Slow Drains Throughout the House

A single slow drain usually indicates a localized clog. Multiple slow drains throughout the house — especially when they all seem to be getting worse at the same time — suggest a problem in the main sewer line rather than individual branch lines. If your kitchen sink, bathroom sink, and shower are all draining slowly, the issue is downstream of where those lines connect.

2

Sewage Backups in Multiple Fixtures

When you flush the toilet and water backs up into the shower, or when you run the washing machine and the toilet gurgles, you have a main sewer line obstruction or collapse. Sewage backing up into the lowest fixtures in the house (floor drains, basement toilets) is a serious warning sign. This is a health hazard and requires immediate attention.

3

Sinkholes or Depressions in the Yard

A collapsing sewer line can create voids in the soil above it as the pipe fails and soil settles into the pipe. This appears as depressions, soft spots, or sinkholes in your yard — particularly along the path from your house to the street. Lush, unusually green grass in a specific area can also indicate a leaking sewer line fertilizing the soil above it.

4

Sewage Odors Inside or Outside

A properly functioning sewer system is sealed. If you smell sewage inside your home (particularly in the basement) or in your yard, the sewer line has a breach. Sewage odors are not just unpleasant — they indicate methane and hydrogen sulfide gas, which are health hazards at elevated concentrations.

5

Rodent or Insect Infestations

Rats and cockroaches can enter homes through cracked or collapsed sewer lines. If you're experiencing unexplained pest problems — particularly in a home that hasn't had them before — a damaged sewer line may be the entry point. Pest control companies often identify this as the source during inspections.

6

Age of Your Home

Homes built before 1970 in Southern Maryland often have clay tile or cast iron sewer lines that are reaching or past their design lifespan. Clay tile is particularly susceptible to root intrusion and joint failure. If your home is 50+ years old and you haven't had a sewer camera inspection, it's worth doing proactively — before a failure forces the issue.

The Bottom Line

If you're seeing multiple warning signs, don't wait. A sewer camera inspection takes about an hour and gives you a definitive answer about the condition of your sewer line. The cost of inspection is trivial compared to the cost of emergency sewer replacement.

Sewer Camera Inspection

We perform sewer camera inspections throughout Southern Maryland. We'll show you exactly what's in your pipe and give you honest options for repair or replacement.

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