Where is the main cleanout located?

Author: Camryn Lowe MD  |  Last update: Sunday, May 10, 2026

A cleanout is a 3- or 4-inch pipe fitted with a screw cleanout 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.

How do I find the main drain cleanout?

Finding an Indoor Drain Cleanout

The cleanout is located after where the drainage lines meet the main sewer line. It is usually in the form of a T- or Y-shaped pipe fitting, topped by a threaded plug and square nut possibly covered by a plastic cap.

Where should cleanouts be located?

Plumbing code also requires that the cleanout has to extend up above the ground level, but in some older homes, the cleanouts may be buried just under the surface. In extremely cold climates, the cleanout is instead usually located inside to prevent the sewer line from possibly freezing.

What does my sewer cleanout look like?

A sewer cleanout is generally, but not always located outside a bathroom. You'll recognize it as a black or white, three- to four-inch capped pipe. Since cleanouts aren't needed often, yours may be covered by bushes, underbrush, or grass.

Do all houses have a sewer cleanout?

A lot of people think they don't have sewer cleanouts. But as I said, pretty much all homes do these days. It's more likely that your sewer cleanout is buried, often in a flower bed area. People cover up the cleanout because they think it's an eyesore.

How to find your sewer cleanout (and why it's important!)

How do I unclog the main sewer line?

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 remove sewer cleanout?

Apply rust penetrant and vibration

Then soak the cleanout plug threads with rust penetrant. Next, smack opposite sides of the tee or wye fitting at the same time using two hammers. Rotate the double blows around the entire fitting. Then try using a pipe wrench again.

How do I know if my cleanout is clogged?

The following are signs to watch for that can help you detect a sewer blockage in your home.
  1. Multiple Fixtures Are Clogged. ...
  2. Flushing the Toilet Causes Water to Come Up Elsewhere. ...
  3. Water Draining From Your Washing Machine Causes an Overflow in Other Locations. ...
  4. Drainage at the Cleanout. ...
  5. Slow-Draining Sinks or Toilets.

What happens if you don't have a sewer cleanout?

If you don't have drain cleanouts, backups can still be removed but it can sometimes be more challenging. The plumber has two options in this situation: access the sewer line from the roof or from the toilet. Unfortunately, neither option is as effective as going in through a cleanout.

How deep is a sewer cleanout?

The sewer cleanout is capped off with a cleanout cap where the pipe is open above ground. Whether your sewer line is 8' deep or 3' deep it doesn't matter. The section of pipe that is extending the sewer opening above ground will give access to your sewer line without having to dig up your sewer line.

How much does a sewer cleanout cost?

On average sewer cleanout installation cost runs between $1,850- 3,500. This cost depends on several factors such as depths, or whether or not landscape or concrete will be removed, to create a proper workspace to access the sewer line.

How deep are sewer lines buried?

For instance, residential sewer line depth ranges from 18 to 30 inches. However, city sewer line depths are different. Your city's sewer lines must always be deeper than the deepest residential pipe to allow waste to flow downhill. As such, these lines can go as deep as needed.

Why do I have three sewer cleanouts?

Double cleanouts is common in longer runs. But having a third might indicate someone didn't find the original and went to install a two way cleanout setup and found it once they finished digging to put in the two way.

What is a main cleanout?

A cleanout drain allows the homeowner an access point to the main sewer line. Most drain cleanouts are located outside of your home in the back or front yard, they look like capped pipes sticking up from the ground 3-6 inches they look like plumbing fixtures.

Where is the cleanout plug located?

A cleanout is a 3- or 4-inch pipe fitted with a screw cleanout 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.

How often should sewer lines be cleaned?

Expert Recommendations for Sewer Line Cleaning

We recommend homeowners schedule sewer line cleaning every 18 to 24 months to prevent buildup and clogs. Regular cleanings help avoid costly repairs and extend the life of your plumbing system.

Where are most sewer cleanouts located?

Indoor cleanouts are often located near a bathroom, utility room, or garage floor drain. If this is the case, it should be easy to spot, as it's usually positioned directly next to the drain or just a few feet beside it. However, some cleanouts may be harder to spot and require access to your home's crawl space.

How do you unclog a main sewer line with a cleanout?

Find a clean-out plug located on a large drainpipe in areas such as your basement, crawlspace, garage or near the foundation of your house. Remove the plug with an adjustable wrench. Wastewater may drain out when you open the clean-out and when you break the clog.

What does a sewer cleanout look like in the house?

It often looks like a metal, white, black or gray PVC pipe sticking out of the ground, either in your yard or along an outside wall and capped with a threaded end.

Will Drano unclog a main sewer line?

With a clogged basement drain, pouring Drano or similar products down your sewer drain can actually damage your pipes or the glue holding them together, causing more sewer system problems in the future.

How much does a plumber cost to unclog a main 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.

Is a clogged sewer line covered by insurance?

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 much does a sewer trap cleanout cost?

Depending on the job's difficulty, cleanout installation will cost the average homeowner between $650 – $2,000, with the highest cost reserved for those that require extensive digging and retrofitting.

How to open a stuck sewer cleanout?

The first is an old-fashioned steel chisel and a ball peen hammer on the face of the clean-out at a 45-degree pointing in the desired turning direction (counter-clockwise). Once there's a little divot in the clean-out, turn the chisel on a sharper angle to provide more turning force.

How deep are sewer cleanouts buried?

Sewer cleanouts are typically 6 inches to 3 feet deep.

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