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4 Signs Your Main Sewer Line Is Clogged


Plumbing issues and specifically main sewer blockages can be a major headache. The longer you let them go unchecked the worse the problem can grow and the sooner you can recognize the warning signs of a main sewer line blockage, the better. A clog in the main sewer line that goes ignored or unrecognized can lead to costly repairs or  can expose you and your family to contaminated water.

To help keep your family and home safe, we’ve covered 4 warning signs that your home’s main sewer line is clogged.

Let’s take a look at the tell-tale signs of a clogged main sewer line…

Sign #1: Multiple drains are backing up

Your home’s drain lines carry wastewater away from your home and are designed like a tree—the “trunk” is the main sewer line while the “branches” are smaller, secondary drain lines that connect to each water fixture (all secondary lines feed into your main sewer line). 

Every water fixture’s drain eventually connects to the main sewer line, a blockage in that main line will affect various drains in your home. The visual will help you understand how your home drains and show how a main backup can impact multiple drains in your home.

Residential drain pipe diagram

To diagnose check the following water fixtures:

  • Toilets
  • Sinks
  • Bathtubs
  • Showers

If more than one drain is slow moving, gurgling, smells bad or has water backing up, you most likely have a main sewer clog.

You see, your home’s drain lines carry wastewater away from your home and are designed like a tree—the “trunk” is the main sewer line while the “branches” are smaller, secondary drain lines that connect to each water fixture (all secondary lines feed into your main sewer line).

And because every water fixture’s drain eventually connects to the main sewer line, a blockage in that main line will affect various drains in your home.

Sign #2: Drainage appears in the sewer clean out

If you see sewage standing in your yard or draining out of your home’s sewer line cleanout pipe, you likely have a main sewer clog.

What is a sewer line cleanout pipe?

So, what exactly is a “sewer cleanout” and how can you find yours? Well, a “sewer cleanout” is a pipe that connects directly to your home’s main sewer line to give plumbers direct access to clear any blockages.

In most Colorado homes, the sewer cleanout is usually located just outside your home or in the basement and is marked by a round or rectangular cap (sometimes titled “sewage” or “cleanout”).

Examples of what your sewer cleanout might look like:

Fresh dirt showing where to clean out sewer
Underground dug up showing sewer pipes

What should you do if sewage is coming out of your sewer cleanout pipe?

After you find your sewer cleanout, look and see if you see sewage standing in (or draining out of) the sewer cleanout. If sewage or dirty water is coming out of your home’s sewer line cleanout, or if there is water standing around the cleanout pipe, this confirms you have a main sewer line clog. You should immediately call the professionals at Plumbline to clear the main sewer line clog of your Colorado home.

 

Sign #3: Sewage in floor drain

Most homes built today are required by local code to have floor drains that lead to a collection pit where a sump pump carries the water to the surface. Many times the floor drains are located on the base level floor or in basements. 

If your main sewer line is clogged, all the sewage and waste water sitting in the pipes have nowhere to escape. This means, eventually, the sewage will force its way into a secondary drain. And when this happens, you’ll soon be able to see (and smell) sewage coming up from floor drains that are commonly located in bathrooms, kitchen, laundry rooms, and basements.

Why is water flowing out of the floor drain in my house?

As the name would suggest, floor drains are secondary drains that are commonly installed on the floor in places where standing water could become dangerous or hazardous. Floor drains commonly function as a secondary gateway for excess water to flow out of an area. If your floor drain backs up or becomes slow to drain, it’s most likely because your plumbing system has a main sewer line clog. 

What should you do if a floor drain backs up in your home?

A floor drain backing up is usually due to wastewater looking for a place to escape when there is a clog in the main sewer line. If sewage is backing up in your floor drain, it’s likely a sign of a main drain clog that needs to be cleared by a professional plumber. If you have periodic floor drain back-up problems, scheduled, routine maintenance performed by a professional plumber is also something you should consider.

Sign #4: Water backs up in shower when toilet flushes

If you notice that water backs up in random places as you’re using water fixtures, you likely have a blockage in the main sewer line.

Two common examples of this include:

  • When you flush your toilet, water backs up into the bathtub/shower.
  • When you run your washing machine, sinks or toilets start to overflow.

You see, a clog in the main sewer line means all the wastewater that is trying to leave your home now has nowhere to go and is eventually forced back up other drain lines.

Diagram of clog in bathroom drain

What should you do if sewage starts coming out of your shower or bathtub drain?

If your toilet is backing up and sewage is coming out of your shower or bathtub drains, you most likely have a main drain clog. It’s important that you call a professional plumber to to evaluate your main sewer line to determine the source of the problem and to make repairs before the issue gets worse.

How to clear a main sewer line clog?

A clogged plumbing system can be quite frustrating. And if not rectified fast, it can cause serious and expensive damage to your home. Though some homeowners have the plumbing knowledge to take on a DIY drain clearing project, seeking the help of a professional plumber is always the best solution, especially if you prefer to avoid making the situation even worse.

Determine what is causing the clog

It may be difficult to determine the source of the main drain clog without having the right tools. This is where a professional plumber can help. They will have the experience, knowledge, and technology needed to pinpoint the location of the clog that is affecting your home’s plumbing system. 

At-home remedies to unclog a main sewer line

Sometimes, hot and soapy water can help loosen whatever is clogged in the drain. However, it’s important to note that hot water works best on clogs caused by grease, fats, oil, and organic matter. It doesn’t work so well on clogs caused by hair or other substances.

This may take a few tries to work, and you should definitely avoid using this method if you have PVC pipes or porcelain sink bowls. 

Dish Soap and Hot Water

Boil eight cups of water it in a pot and mix in a few tablespoons of dish soap. Slowly pour the mixture down the sink or drain.

Unclog the main sewer line with a snake

The best way to unclog the main drain is to use a professional plumbing snake system. However, if you’re a first-timer, it’s important that you know how to use a plumbing snake, because it can actually damage your pipes if used improperly. We recommend always seeking the help of a professional plumber rather than attempting to snake your plumbing system on your own.

 

How much does it cost to have drain cleaning done in your home?

In Colorado, the average cost for drain clearing ranges from $100 to $500. The price varies depending on factors such as the severity and location of the clog.

But the good news is that we'll clear your main drain for just $93. And the best part? If we can’t clear the clog in your main sewer line, the call is free.

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Need help from a Colorado Plumbing, Heating, Cooling, or Electrical Specialist? 

For your convenience, you can request an appointment in one of two ways:

  • Call us at (303) 436-2525 for immediate assistance.
  • Click on the button below to schedule your appointment online.

 

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