How do you tell if sewer line is clogged or broken?

Author: Miss Dana Wolf DVM  |  Last update: Friday, February 27, 2026

When the sewer line that carries waste away from the house is blocked, you'll notice the four signs that follow.
  1. All Your Drains Reek. ...
  2. Your Drains Are Blocked or Slow-Moving. ...
  3. You Hear Loud Gurgling Sounds Coming From Your Pipes Throughout Your Home. ...
  4. You Have an Unnaturally Lush Landscape or a Smelly, Sunken Lawn.

What are the symptoms of a clogged sewer line?

Signs of a Clogged Sewer Line
  • Gurgling Sounds in Different Drains. A toilet may gurgle when you turn the washing machine on, or a sink or shower drain gurgles when the toilet is flushed. ...
  • Plunging Becomes a Common Chore. ...
  • Water Backs Up the Sewer Line Cleanout. ...
  • Your Drains Are Starting to Smell. ...
  • Your Yard Is a Mess.

What is the difference between a clogged pipe and a broken pipe?

For instance, a clog may send gray water into an adjoining sink, tub, or reservoir, while a broken septic pipe will send black sludge and foul water into sinks, tubs, or other outlets throughout the house. This backup can pose health hazards over time.

How do you know if you have a sewer line break?

The most common sign of a sewer break is when you can see water coming up in your basement from the sewer pit, floor drain, through your walls, or on your sidewalk. Sewer breaks further out than your front yard will typically not surface due to the depth of the pipe.

How do you tell if you have a broken drain pipe underground?

How to Tell if You Have an Underground Drainage Leak
  • Here's what to look out for...
  • Excessive amounts of water in your soil
  • A suddenly-damp basement
  • Your water bills suddenly rocket
  • A sudden drop in water pressure
  • Movement in the soil around the house
  • You can hear the leak

Signs of a Clogged Sewer Line and What to Do About It

Is a broken sewer line covered by homeowners insurance?

Does homeowners insurance cover your sewer line if it's damaged? Damage to your sewer line may be covered by your policy if it is caused by perils such as hail or windstorms, explosions, lightning or fire, damages caused by vehicles, vandalism or falling objects.

How do I know if my underground drain is clogged?

If you notice water gushing back out from the drain pipe or leaking out from the seams on the adapter, that is a sign that there are clogs in your underground drain.

How do I find a broken sewer line?

It can typically be found in the basement, crawl space or garage. You will want to search for a pipe that is approximately four inches in diameter with a screw cap on the top that has a notch or square knob at the top. Note that some homes have an indoor sewer cleanout point, while others may be located outdoors.

Who is responsible for blocked sewage pipes?

Generally speaking, you're usually responsible for drains inside the boundaries of your property, while the sewerage company is responsible for lateral drains, which are usually outside of property boundaries, and sewers. Although most sewers are now publicly owned, there are still some private or unadopted sewers.

How do I test my main sewer line?

Test Balls for Drainage Lines

To start the process, make sure your main line sewer cleanout is clear of debris and liquid. Next, insert the test ball and inflate it so that it blocks the main line. Fill the sewer system with water and observe the water level for 15-20 minutes.

How much does it cost to fix a clogged sewer line?

You will likely pay around $350 to $650 to have a plumber unclog a main sewer line unless you have complications like serious damage to the line.

How to clear a main sewer line clog yourself?

Your step-by-step guide: How to clear a main sewer line clog
  1. Step 1: Loosen the cap on the drain pipe. ...
  2. Step 2: Open the cap and let the buildup drain out. ...
  3. Step 3: Feed the auger cable into the drain pipe. ...
  4. Step 4: Run the auger until the clog is clear—and beyond. ...
  5. Step 5: Hose down the pipe and auger cable.

How do you diagnose a broken pipe?

6 Sure Signs You Have Broken Pipes
  1. Your Water Bill is Very High. It's already frustrating when you get a high water bill. ...
  2. Unpleasant Odors. ...
  3. Damp Walls and Carpet. ...
  4. You Can Hear Water Moving. ...
  5. Lessened Water Pressure or Quality. ...
  6. Mold Is Growing.

Can a plumber fix a clogged sewer line?

The Plumber Will Handle the Problem

Plumbers have specialized tools to help clear problem clogs, such as a hydro jetter or more industrial drain snake. If they can unblock the pipe that way, then the cost should be minimal. If the problem is a broken pipe or tree roots, then the repair will be costly.

How do I know if my sewer is blocked?

Smelly, noisy or slowly moving drains

Again, if there's an issue with the main sewage line, all the drains will be affected. So if all the drains in your house smell bad, produce gurgling noises, or they are draining slowly - the main sewage line could be blocked.

How do you fix a damaged sewer line?

Pipe lining—If the damage to your sewage pipe is minimal, pipe lining can be used to insert an inflatable tube covered in epoxy into your sewer line. From there, the tube is inflated, pressing against the existing line. While it's up against the existing sewage line, the epoxy cures and hardens, repairing the leak.

Who is responsible for a clogged sewer line?

The city is responsible for any sewer problem starting from the main sewer line. This line carries waste from your home and surrounding homes to places like the city's treatment plant. The pipe usually sits outside your property line on public property.

How much does it cost to unblock a sewage drain?

Cost Factors of Cleaning and Unclogging Drains

The overall cost of drain unclogging will depend on the blockage type, for instance, a small blockage in a toilet or sink is normally only priced at around £50 to £70. However, a more extensive blockage deep in your drains could end up costing you around £150 to £200.

How to tell if an outside drain is blocked?

This blog will point out the key signs to look out for before discussing the steps to take when you think your drainage system is clogged.
  1. Slow Drainage. ...
  2. Unpleasant Smells and Odours. ...
  3. Gurgling Sounds Coming from Drains and Plug Holes. ...
  4. Raised Water Levels.

Does homeowners insurance cover broken sewer pipes?

Key takeaways. Homeowners insurance may cover sewer line damage if it stems from something already included in your policy, like a fire or windstorm. Sewer line damage that is the result of wear and tear is excluded from home insurance coverage.

How do I know if my sewer pipe is broken?

7 Warning Signs Your Sewer Line Needs to Be Replaced
  1. There's a Spike in Your Water Bill. ...
  2. You Hear Gurgling Coming from the Pipes. ...
  3. The Water Is Slowly Draining. ...
  4. Your Yard is Soggy. ...
  5. The Smell of Sewage Lingers. ...
  6. Pests Are Attracted to Your Yard. ...
  7. The Toilet Bowl Water Level Is Up and Down.

Do plumbers check sewer lines?

Professional plumbers can use various camera styles to inspect the sewer line, such as: Remote-controlled crawler cameras. Pole or fixed zoom cameras. Push rod cameras.

How do I know if my underground drain pipe is burst?

How to Tell if a Pipe Burst Underground
  1. Potholes or Sinkholes Around Your Lawn. These holes indicate a faulty pipe. ...
  2. High Water Bills. ...
  3. Fluctuating Water Pressure. ...
  4. Puddles or Pooling Water. ...
  5. Discolored Water and Odors. ...
  6. Overly Green Grass.

How do you know if your main pipe is clogged?

Watch Out for These Four Signs of a Clogged Sewer Line?
  • All Your Drains Reek. It's not uncommon to have a single drain that emits a foul odor. ...
  • Your Drains Are Blocked or Slow-Moving. ...
  • You Hear Loud Gurgling Sounds Coming From Your Pipes Throughout Your Home. ...
  • You Have an Unnaturally Lush Landscape or a Smelly, Sunken Lawn.

How to unclog a sewer line?

Mix 1/3 of a cup of vinegar with 1/3 of a cup of baking soda and pour the fizzy mixture into the clogged sewer drain immediately. If you don't know how to unclog main sewer line, take advantage of vinegar to eliminate the grime, grease, and hair in the pipe. Flush the pipe with hot water after one hour.

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