How Deep Is The Sewer Line Under The Slab

How Deep Is The Sewer Line Under The Slab

If you are planning on having a new home built, or if you are doing some remodeling, it is important to know how deep the sewer line is under your slab. If you are lucky, the sewer line will be shallow enough that you can have it easily accessed for repairs or maintenance. However, sometimes the sewer line can be quite deep – especially if your home was built many years ago. In this blog post, we will explore why it is important to know how deep the sewer line is under your slab, and we will provide some tips on how to find out this information.

How Deep Is The Sewer Line Under The Slab?

The typical sewer line under a slab is about four feet deep, although the depth can vary depending on the soil type and other factors. A deeper sewer line may be necessary in areas with very sandy or clay-like soil, for example. Additionally, some local codes may require that the sewer line be even deeper in order to prevent any potential issues.

What Is A Sewer Line?

A sewer line is a pipe that carries wastewater from your home or business to the municipal sewer system. Sewer lines are typically made of clay, concrete, or PVC, and they can be buried underground. Over time, these pipes can become cracked or damaged, which can cause sewage to leak into the ground and potentially contaminate groundwater. If you think you have a sewer line issue, it’s important to contact a professional plumber for help.

What Are The Signs Of A Broken Or Clogged Sewer Line?

Foul smells coming from your drains

If you notice foul odors emanating from your drains, it could be a sign that your sewer line is broken or clogged.

Slow draining sinks and toilets

If you find that your sinks and toilets are draining more slowly than usual, it’s another potential sign of a sewer line issue.

Water backing up out of drains

This is perhaps the most obvious sign that there is a problem with your sewer line. If water starts backing up out of your drains, it means that the line is either broken or clogged.

Gurgling sounds coming from drains

Another unusual symptom of a sewer line issue is if you hear gurgling sounds coming from your drains. This is usually an indication of a blockage.

Overflowing toilets

If your toilet starts to overflow for no apparent reason, it’s another sign that there may be a problem with your sewer line.

Green grass in your yard 

If you notice patches of green grass in your yard, it could be a sign that sewage is leaking from a broken sewer line.

Sinkholes in your yard

Another serious symptom of a sewer line issue is the formation of sinkholes in your yard. This is usually caused by a collapsed sewer line.

Wet spots in your yard

If you notice any wet spots in your yard, it could be another sign of a sewer line problem. This is often caused by sewage leaking from a broken line.

Cracks in your foundation

If you notice cracks in your foundation, it could be a sign that your sewer line is causing the problem. The weight of the sewage can put pressure on the foundation and cause it to crack.

Higher water bills

If you notice that your water bill is suddenly higher than usual, it could be an indication that there is a leak in your sewer line. A broken or clogged sewer line can cause water to leak into your home, which will increase your water usage and therefore your bill.

How Can You Prevent A Broken Or Clogged Sewer Line?

  • Use a drain cover: A drain cover can help to keep larger objects and debris from going down your sewer line and causing a clog.
  • Don’t pour grease down the drain: When hot grease cools, it can solidify and cling to your pipes, eventually leading to a clog.
  • Be mindful of what you flush: Flushing non-flushable items like diapers, feminine hygiene products, and paper towels can cause major issues for your sewer line.
  • Avoid using chemical drain cleaners: The harsh chemicals in these products can damage your pipes and actually make clogs worse.
  • Have your sewer line inspected regularly: Having a professional inspect and clean your sewer line on a regular basis can help to prevent clogs and other issues.
  • Repair any leaks: Leaks in your home can allow water to seep into your sewer line, causing damage and potentially leading to a clog.
  • Routinely clean your drains: Keeping your drains clean can help to prevent clogs from forming in the first place
  • Don’t plant trees near your sewer line: The roots of trees can grow into and damage your sewer line, eventually causing a blockage.
  • Install a backwater valve: A backwater valve will help to prevent sewage from flowing back up through your pipes and into your home in the event of a clog.
  • Call a professional if you have any concerns: If you think you may have a clog or if your drains are backing up, it’s best to call a professional for help. Trying to fix the problem yourself can often make things worse.


So, how deep is the sewer line under your slab? The answer may depend on where you live. In general, the deeper the line, the more expensive it will be to repair or replace. If you are unsure of the depth of your sewer line, have a professional come out and take a look for you. Knowing this information ahead of time can help you make better decisions about home repairs and renovations in the future.