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What is a drain clean out

Author

Olivia Zamora

Published Apr 03, 2026

A drain cleanout provides access to your main sewer line and is located outside of your home in the front or back yard. Cleanouts typically go unnoticed until there is a problem. They look like capped pipes sticking a few inches above the ground.

What is a sewer cleanout?

The sewer clean out is a pipe or pipe(s) with a cap that provides access to the sewer line so that blockages can be removed. The lateral sewer line is the sewer line that connects your home to the main public sewer system. Usually, the sewer cleanout is located somewhere along the lateral sewer line.

What does a drain cleanout look like?

The cleanout is usually a 4-inch-diameter pipe with a screw cap that has a square knob or indentation on the top. It’s most likely going to be popping up from the ground outside your home between the foundation and the street. The cleanout might also be on the side of the home, closest to the bathroom.

Where do you put Cleanouts?

A cleanout shall be installed above the fixture connection fitting, serving each urinal, regardless of the location of the urinal in the building. Exceptions: (1) Cleanouts shall be permitted to be omitted on a horizontal drain line less than 5 feet (1524 mm) in length unless such line is serving sinks or urinals.

How often should you clean out your sewer line?

You want to avoid any issues which can become quite costly, so knowing when and how often to have your sewer cleaned out is knowledge you’ll want to retain. A good general rule is to have your home’s sewer lines cleaned out every 18 to 22 months.

Do I need a clean out?

WHY SHOULD I HAVE A CLEAN-OUT? A cleanout makes getting to clogs and build up in your drains much quicker and easier. Without a clean-out in place, plumbers have to access the sewer line through a toilet.

Should there be water in my clean out drain?

If you see any sewage or water around the outside of that cap, you definitely have a blocked sewage drain. If you pull off the cap and see standing water inside the sewer cleanout, that’s also indicative of a blocked sewer drain.

Is a toilet considered a cleanout?

many codes consider the toilet a proper cleanout but very few if any plumbers do. if you eally want access for cleaning put one between the toilet and its vent. Pulling the toilet and snaking from there is without question the best place to snake from if the line is plugged.

How do you know if your main drain is clogged?

Early warning signs of the drain being clogged are hearing bubbling or gurgling sounds coming from one or more of your drains. Or your toilet water or faucets may bubble, and waste water may back up into your tub or shower drain when you flush.

How do I find my main drain cleanout?

Look behind bushes, or in a metal or plastic box recessed into the ground. The main clean-out fitting is usually a large-diameter pipe with a threaded plug in the top. It may be extending above the ground near an outside wall or may be contained inside a ground box covered by a metal cover.

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How long does it take to clean out a sewer line?

The acid in these drains destroys the lining of your sewer pipes. That’s why smart homeowners choose professional drain cleaners to restore their pipes quickly. Drain cleaning from the professionals just takes a couple of hours. You can expect your cleaning company to finish the task in less than three hours.

What causes a clog in the main line?

The most common type of debris that clogs a sewer line is fat. If you pour greases, fats or oils down a sink drain, they will eventually cool and harden. Even if you run hot water with the grease, it typically firms up by the time it reaches your main sewer line. Then, the fat sticks to your lines and causes a clog.

Should there be standing water in outside drain?

The first answer is YES: Your sewer drains should hold water in certain locations. The reason for the water in the drainage fixture is to prevent rodents and smells entering the building. … If you do however notice excessively high levels of water there could be a blocked drain causing the problem.

How long does it take to snake a main drain?

How Long Does It Take To Snake A Drain? Plumbers take about five minutes to snake a drain for clogs located near the tub, toilet, or sink. Main line sewer clogs can take hours to snake, depending on the length and number of pipes affected.

Where is the main drain located in a house?

It can usually be found in the basement, garage, or crawl space. You will want to look for a pipe that is about four inches in diameter with a screw cap on the top with a notch or a square knob at the top. Note that some houses have an indoor sewer line cleanout point, while others might be located outdoors.

How much does it cost to clean out a drain line?

Cleaning a sewer line costs an average of $326, with a typical range between $176 and $476. If you notice water backing up in a toilet or sink, low water pressure, slow drains, an unpleasant smell, or water pooling in your yard, it could be a sign you have a sewer main line that needs addressing.

How much does it cost to unclog a main sewer line?

The national average cost to unclog a main sewer line is between $350 and $650, with most people paying around $475 to clean a mid-sized clog by hydro jetting the main sewer pipe between a house and municipal main line.

How do you clean drain pipe build up?

Boil a pot of water. Pour ½ cup of vinegar and ½ cup of baking soda into the drain. Put cleaning rag over the top of the drain to cover it. Wait 5 minutes or so while the mixture eats away at the buildup.

Does a sink need a cleanout?

A cleanout is only required on the building drain as it is defined in Chapter 2: Building Drain – “That part of lowest piping of a drainage system which receives the discharge from soil, waste and other drainage pipes inside the walls of the building and conveys it to the building sewer beginning two feet outside the …

How deep is a cleanout?

A cleanout is a 3- or 4-inch pipe fitted with a screw cap, and it is easily identifiable. Therefore, looking around the compound is one way to determine its location. In most homes, the cleanout is located close to the bathroom, either inside or outside the house.

Can a sewer line unclog itself?

When a toilet has a clog made of water-soluble materials, it has a chance of slowly dissolving in the water and freeing up the toilet to work properly again. So, clogs that are primarily made of toilet paper can clear themselves.