Sewer Line Cleanout: What It Is and Where to Find It

Short answer

A sewer line cleanout is a capped pipe that gives a plumber direct access to your sewer line. It usually sits outside, near the house wall or the property line, or indoors in a basement or garage. The cap is a round screw-in plug, often plastic or metal, with a square nub on top.

Find yours before you need it. If wastewater backs up, stop using water, keep people and pets away and call a licensed plumber or your local health department. Who pays for which part of the line depends on your city.

A sewer cleanout is one of the most useful and least noticed parts of a house. Most people learn where theirs is at the worst moment, with water coming up through a floor drain. This guide explains what a sewer cleanout is, where to look, what sewer cleaning involves, how snaking and jetting differ for a sewer line, who is responsible for which part of the line, what to do in an emergency and how to find and vet a sewer cleaning company near you.

It is written for homeowners, mostly in the US, with a note for Canadian readers. Rules and prices differ by city and county, so this page states no local rules. It tells you who to ask.

What a sewer line cleanout is and where to find it

A sewer cleanout, also written sewer line clean out, is a pipe with a removable cap that connects to your sewer line. Its job is access. A plumber can open it, feed a cable or a hose into the line and clear a blockage, or send a camera down to look. Without one, the plumber has to work through a toilet, a roof vent or another opening, which is slower and messier.

Utilities describe cleanouts in similar terms. Gwinnett County, Georgia, for example, explains on its sewer lateral page that a cleanout has a plastic cap and may come up to ground level or sit under a small plastic box set level with the ground, and that some homes have two.

Sewage line cleanout, main line cleanout and drain cleanout: the same thing?

Mostly the same part under different names. Sewer line cleanout, sewage line cleanout and main line cleanout all usually mean the capped access on the line that carries everything from the house to the street. A drain cleanout, or plumbing drain cleanout, is the broader term for any capped access on a drain pipe, including a branch line inside the house. Plumbers use the words loosely, so ask which line the access serves.

Typical layout; yours may differ. Text version: the sewer line leaves the house underground and runs to the main in the street. The cleanout is a short pipe rising from that line to ground level, with a cap on top. Some homes have a second one near the property line, or an indoor one.

Where to look for the main sewer cleanout

Outside, near the house. Look along the foundation on the side where the main drain leaves the building.
Near the property line or street. In many places a second cleanout sits close to the boundary or the sidewalk.
In the yard. A round or square lid in the grass, mulch or paving can be a cleanout cover.
Inside. In a basement or garage, look for a capped pipe near the floor.
A plumber. If you cannot find one, a plumber can locate it, or tell you the house has none.

What a cleanout cap looks like

Shape. A round plug that screws into the top of the pipe, often wider than you expect.
Material. Often black or white plastic on newer lines, and metal such as brass or iron on older ones.
Top. Usually a raised square or hex nub that a wrench turns, sometimes a recessed slot.
Cover. In a lawn or driveway it may sit under a round or square lid set level with the ground.

Caps can rust, crack or get painted over. A cap that is missing, cracked or leaking can let in debris and let out sewer smell, so mention it to a plumber. Do not force a stuck cap.

Once you find it, check the cap is intact and photograph it for your records. Do not open a cleanout during a backup unless a plumber tells you to, since wastewater can come out.

Why it matters: a cleanout makes a stoppage quicker to deal with, lets a camera see the pipe and gives a clear reference point, since cities and plumbers often describe responsibility by it. If your house has none, ask a plumber whether adding one makes sense. That is a job for a licensed plumber under your local rules, not a DIY task.

What happens when the main line backs up

Every drain in the house joins the main line, so a blockage in the main shows up in the lowest fixtures first. Typical signs of a main or sewer line problem are:

Several fixtures slow or blocked at once, not just one sink.
Gurgling from toilets or drains when another fixture runs.
Water or sewage coming up in a basement floor drain, tub or shower.

One slow sink is usually a local problem; see clogged drain: DIY or call a plumber. Several slow fixtures point to the main. A recurring backup can mean grease or roots in the line, a damaged section or, if you have one, a septic system issue.

What a cleanout service involves

A cleanout service is a plumber's visit to clear or inspect the line through this access. In outline, the plumber removes the cap, feeds a cable, a jetting hose or a camera into the line, clears the blockage or looks at the pipe, then reseals the cap. Doing it through the cleanout avoids pulling a toilet, which is why a plumber will ask you where it is. If a quote says "main sewer line from the outside cleanout", that is the access it means.

Snaking versus jetting for a sewer line, and tree roots

Sewer snaking and sewer jetting are the two common ways to clean a sewer line. Both usually go in through the cleanout.

Sewer snaking vs hydro jetting
Question	Sewer snaking	Hydro jetting
How it works	A rotating cable with a cutting head bores through or pulls out the blockage	A hose and nozzle send pressurized water to break up and flush out buildup
Good fit	A simple blockage; a quick way to get flow back	Grease, scale, repeat clogs, some roots in sound pipe
Weakness	May leave film on the pipe wall, so clogs can return	Not a fit for pipe that is cracked, brittle or collapsed
Camera first?	Helpful	Strongly advisable for older lines

Some companies start with a snake to restore flow, then camera the line, then suggest jetting if the camera shows buildup. For more on the method, read hydro jetting explained. For price, see drain cleaning cost.

Tree roots in general terms

Roots look for water and nutrients. A sewer line carries both, and a small gap in a joint can let fine roots in. Once inside, they can catch paper and grease and slow the flow. Roots are more common in older pipe with many joints.

Cutting or jetting roots clears the pipe, but if the opening remains the roots usually return. A camera can show where they enter and whether the pipe is damaged. Whether to repair, replace a section or schedule regular cleaning is a question for your plumber.

When a camera inspection helps

A drain camera shows the inside of the line on a screen. Ask for one when:

The line has backed up more than once.
The house is older, or you do not know what the pipe is made of.
You are buying a home and want to know the sewer line condition.
A plumber suggests jetting, digging or replacement.

Ask for the recording, plus a note on where along the line any problem sits. A video lets a second company price repairs without repeating the inspection.

Who is responsible for which part of the line

This differs by city, and it is the question homeowners most often get wrong. Some utilities treat the whole lateral, from the house to the main in the street, as the owner's. Others split it at a cleanout or at the property line, with the city responsible for the section beyond. For instance, the city of Fullerton, California, and Gwinnett County, Georgia, describe different arrangements on their own pages.

Do not assume. When there is a backup:

Call your city or utility's sewer or public works office, and ask where the owner's responsibility ends and the utility's begins at your address. Some utilities will check whether the blockage is in the main.
Ask your home insurer whether sewer or drain backup is covered and what you must do to make a claim. Coverage differs by policy and often needs an endorsement.
Keep photos, the camera video and every invoice.

If you rent, tell your landlord first. On a shared line, the association may be responsible. Ask a lawyer if there is a dispute.

Emergency steps when sewage backs up

Wastewater in the house is a health hazard, not just a mess. These are basic steps, based on public-health guidance such as the Illinois Department of Public Health's flood and sewer cleanup fact sheet.

Stop using water. No flushing, showers, dishwasher or laundry, since everything you send down may come up elsewhere.
Keep people and pets away from the affected area, especially children.
Avoid contact. Keep skin, mouth, eyes and food away from the water. If you must go in, wear rubber boots and gloves, and wash your hands well afterward.
Call a licensed plumber for an emergency stoppage, and your local health department for cleanup advice.
Call your gas utility or emergency number if you smell gas, and leave the building.
Take photographs for your insurer before cleanup.

Do not pour chemical drain cleaners into a line that is backing up, and tell the plumber what has already gone down the drain.

Sewer cleaning near me: how to find and vet a company, and what a quote lists

Search results for sewer cleaning near me and sewer cleaning company are based on your location, so the companies you see differ from another reader's. Prices and rules depend on your county and state. Use this method.

Search with your town and the service. Try "sewer line cleaning" or "sewer cleanout" plus the town, and look at the map results.
Read Google reviews, newest first. Look for recent reviews that describe real jobs, and how the company replies.
Check the license and insurance. The Federal Trade Commission's advice on hiring a contractor says to check the license is current where licensing applies. Confirm with your state or county board. Ask for proof of insurance.
Ask about emergency hours and fees. After-hours work is often priced differently.
Get the quote in writing before work starts.

Our drain cleaning near me guide goes into the same method in more detail.

Quote checklist

A good sewer cleaning quote names what is being done. Check that it lists:

The line and the access point, such as "main sewer line from the outside cleanout".
The method: snaking, jetting or both.
Whether a camera inspection is included, and whether you get the video.
Any diagnostic, trip or after-hours charge.
What happens if the camera finds damage, and whether a written repair quote follows.
The warranty, in writing, including what happens if the blockage returns.
The company's license number and insurance.

The FTC advises getting several written estimates, not automatically choosing the lowest, and asking about big differences. Pay attention to how deposits are asked for; the FTC cautions against paying the full amount before the work is done.

What to look up where you live

City or utility sewer and public works office. Tells you who is responsible for which part of the line at your address, and whether permits are needed.
State or provincial plumbing or contractor licensing board. Confirms a license and any complaints.
County health department or environmental health office. For sewage backup, cleanup advice and, if you have a septic system, the rules for it.
Your insurer. Ask about sewer backup coverage before you need it.

If you have a septic tank rather than a municipal sewer, a backup may involve the tank or drain field; see septic tank pumping cost.

For Canadian readers. Plumbing is regulated by each province and municipality, and responsibility for the connection to the main differs by city, so ask your municipality. Quotes are in Canadian dollars and are not directly comparable with US figures.

For plumbing and drain company owners

Sewer cleaning and sewer cleanout searches are what your customers type when a line backs up. If you want to be the company they find, see drain cleaning marketing and near me searches for plumbers and septic companies. You can also book a call with LiveLeadsLane to talk it through. LiveLeadsLane is a marketing practice for contractors, not a directory, and it does not take jobs or refer homeowners.

Frequently asked questions

What is a sewer line clean out?

A sewer line clean out, also spelled cleanout, is a capped pipe that connects to your sewer line. A plumber removes the cap to clear a blockage or send in a camera. It is usually outside near the house or property line, with a round screw-in cap.

Where is the main sewer cleanout?

Usually outside, along the foundation where the main drain leaves the house, or near the property line or street. Some homes have one in a basement, crawl space or garage instead. Look for a capped pipe or a round or square lid in the ground. A plumber can find it if you cannot.

Is a sewer cleanout the same as a drain cleanout?

They overlap. A sewer cleanout gives access to the main line leaving the house. A drain cleanout is any capped access on a drain pipe, including branch lines indoors. People and plumbers use the terms loosely, so ask which line a given cleanout serves.

Who handles which part of the sewer line, the homeowner, the city or a plumber?

It depends on your city or utility. Some make the owner responsible for the whole line to the main in the street. Others split it at a cleanout or the property line. A plumber works on the owner side. Ask your city or utility about your address.

What is a sewer cleanout?

A sewer cleanout is a capped pipe that gives direct access to your sewer line. A plumber opens it to clear a blockage or run a camera, without pulling a toilet. Most are outside near the house or the property line, and some homes have an indoor one.

Where is my sewer cleanout located?

Look outside along the foundation where the main drain leaves the house, near the property line or street, and for a round or square lid in the yard. Indoors, check the basement or garage for a capped pipe near the floor. A plumber can locate it if you cannot.

What is the difference between sewer snaking and hydro jetting?

Snaking uses a rotating cable to bore through or pull out a blockage. Jetting uses pressurized water to break up and flush out buildup. Snaking suits simple clogs and fragile pipe. Jetting suits grease and scale in sound pipe. A camera helps decide.

Who is responsible for the sewer line, me or the city?

It depends on your city or utility. Some make the owner responsible for the whole line to the main. Others split it at a cleanout or the property line. Ask your city or utility about your address, and ask your insurer what is covered.

What should I do if sewage is backing up in my house?

Stop using water, keep people and pets away, avoid contact with the wastewater and call a licensed plumber. Ask your local health department for cleanup guidance. If you smell gas, leave and call your gas utility or emergency number.

How do I find a sewer cleaning company near me?

Search with your town name, read recent Google reviews, and confirm the license with your state or county board and the insurance with the company. Ask for a written quote that names the line, the method, any camera video, fees and warranty. Prices vary by area.

Do I need a camera inspection for sewer line cleaning?

Not always, but it helps when backups repeat, the house is older or someone suggests jetting or digging. The camera shows the cause and pipe condition. Ask for the video and a written repair quote if it finds damage.

Sewer line cleanout and sewer cleaning: what to know before the main line backs up