5 Signs Your Sewer Line Has a Problem

Sewer line problems are among the most serious plumbing issues a homeowner can face — and they're also some of the most misdiagnosed. What looks like a simple slow drain might actually be a symptom of a failing sewer line. Recognizing the difference early can save thousands of dollars and significant disruption. Here are the five signs that point to a sewer line problem rather than a simple fixture-level clog.

1. Multiple Drains Are Slow or Backing Up Simultaneously

This is the most reliable indicator that the problem is in the main sewer line. When the issue is isolated to one drain — one sink, one shower — it's almost always a local problem in that fixture's drain line. But when your toilet, the kitchen sink, and the bathtub are all slow or backing up at the same time, there's only one place they all share: the main sewer line that carries waste from your home to the municipal sewer system.

You may also notice that using one fixture causes problems in another. Flushing the toilet causes the bathtub drain to bubble. Running the washing machine causes the bathroom floor drain to back up. These cross-reactions happen because all the drains share the same main line, and a blockage in that line has nowhere to go but back up through the lowest available opening.

2. Gurgling Sounds from Drains and Toilets

Gurgling or bubbling sounds from your toilet — especially after using a sink or shower in another room — indicate that air is being displaced in the drain system. Normally, drain lines vent through a pipe that exits through the roof, allowing air to enter and waste to flow freely. A partial sewer obstruction disrupts this airflow, causing the air to escape through the nearest fixture instead — which produces the characteristic gurgling sound.

Gurgling doesn't always mean the sewer is fully blocked; it often appears in the early stages of a developing obstruction. Acting on this early warning can prevent the problem from escalating to a full backup.

3. Sewage Smell Inside the Home

A persistent sewage or rotten egg smell inside your home — particularly near floor drains, in the basement, or in bathrooms — can indicate a sewer line issue. The normal P-traps in each fixture hold water that blocks sewer gas from entering the home. But a cracked or damaged sewer line can vent sewer gas through the soil and into the home through other paths, or a dry P-trap in a rarely used fixture can let gas through.

If the smell is limited to one fixture and appears after you run water, a dry P-trap is the likely cause (easily fixed by running water in that fixture regularly). If the smell is pervasive and you can't tie it to a specific source, a sewer line inspection is warranted.

4. Unusually Lush, Green, or Soggy Patches in the Yard

Sewage is essentially liquid fertilizer. If your sewer line has a crack or break underground, the escaping sewage can cause dramatically accelerated grass growth directly above the pipe — sometimes in a strikingly linear pattern that follows the pipe route. You may also see soggy or mushy areas in the yard even when it hasn't rained, which indicates water is saturating the soil from below.

In North Texas, clay soils are prevalent — and clay expands and contracts significantly with moisture changes and seasonal temperature swings. This movement exerts pressure on buried pipes and is a primary cause of sewer line joint failure and cracking in this region.

5. Rodent or Pest Activity Near Drains or Foundation

Rats and mice can enter homes through cracks in sewer lines — they're capable of swimming through the sewer system and entering through breaks in the pipe. If you're seeing rodent activity inside your home for the first time and can't identify an obvious entry point, a damaged sewer line is worth investigating. Similarly, certain insects are attracted to sewer leaks and may appear in unusual numbers near the foundation or floor drains.

What to Do If You Suspect a Sewer Line Problem

The most accurate and least invasive way to diagnose a sewer line problem is a video camera inspection. A small camera is fed through the cleanout into the sewer line, allowing us to see exactly what's happening — root intrusion, cracks, offset joints, blockages — without any excavation. This takes the guesswork out of diagnosis and tells us exactly what treatment is needed.

Don't wait if you're seeing multiple signs — sewer problems escalate. Call +1 (972) 544-6460 or contact us online.