Sewer Cleanout: What it is & How to Find it
A clogged sewer line can turn an ordinary day into a plumbing nightmare. Backed-up drains and slow toilets often signal a deeper issue, often followed by unpleasant odors. Fortunately, your home has a built-in access point for this exact problem: your sewer cleanout.
Knowing how to find your sewer cleanout can save you time and money when something goes wrong. This guide covers what a sewer cleanout is and everything else you need to know to keep it in working order and avoid costly plumbing problems.
Key Takeaways
A sewer cleanout is a capped pipe giving plumbers direct access to your home’s main sewer line for clearing blockages.
Most homes have at least one cleanout outside near the foundation, though some also have indoor cleanouts.
Regular access to your sewer cleanout can prevent costly damage from sewage backups.
Common signs of cleanout trouble include slow drains, gurgling pipes, and sewage odors.
Annual inspections and mindful drain habits go a long way toward keeping your sewer line clear.
What is a Sewer Cleanout?
A sewer cleanout is a capped pipe that connects directly to your home’s main sewer line, providing plumbers with a maintenance access point. Most cleanouts are short vertical pipes (typically three to four inches in diameter) topped with a screw-on cap. When a blockage forms somewhere between your home and the municipal sewer or septic system, the cleanout becomes the entry point for clearing it out.
Professionals rely on several techniques to clear clogs through a sewer cleanout. A motorized drain snake can break through soft blockages like grease or paper buildup, while hydro jetting uses high-pressure water to scour tougher obstructions like tree roots. Video camera inspections help technicians pinpoint the exact location of a clog before treatment begins.
Where is the Sewer Cleanout Located?
Sewer cleanout locations vary based on your home’s age, layout, and local plumbing codes. Most single-family homes have at least one cleanout outside, usually within a few feet of the foundation along the path of the main sewer line. Some homes also include indoor cleanouts in utility areas like basements or garages.
If you can’t locate a cleanout on your property, it’s possible a previous owner buried or paved over it. In older homes, cleanouts may be missing entirely; in that case, a licensed plumber can add one.
How to Locate an Outdoor Sewer Cleanout
Most outdoor cleanouts sit between your home and the street, following the path of the main sewer line. To find an outside sewer line cleanout, walk the perimeter of your house and look for a short pipe sticking up from the ground. The cap is typically round or hexagonal, made of either plastic or brass (for older homes), and may sit flush with the soil.
Check landscaping beds and lawn areas near the foundation, as well as the space between your house and the curb. The cap may be hidden under mulch or obscured by overgrown grass. A long screwdriver or thin metal rod can help you probe shallow areas where you suspect a buried cap. A home’s plumbing diagram or property survey will often mark the cleanout’s exact location.
How to Find a Sewer Cleanout Inside
Indoor sewer cleanouts are common in homes without yard access to the main line, or in colder climates where outdoor cleanouts are impractical. Start looking in the basement, where many cleanouts are installed along the lowest run of horizontal drain pipe. Look for a capped fitting on the main waste pipe, often near the floor and close to an exterior wall.
If you don’t have a basement, check crawl spaces and utility rooms. Garages and laundry areas are other likely spots, since these rooms often share plumbing infrastructure with the main line. The indoor cap usually has a square or hexagonal nut on top for removal with a wrench. Larger or more complex homes may have multiple indoor cleanouts.
Why is a Sewer Cleanout Important?
A sewer cleanout serves as the primary entry point for diagnosing and clearing blockages in your home’s main waste line. Without one, plumbers would have to access the line by pulling toilets or excavating sections of the yard. That kind of invasive work drives up labor costs and adds significant time to the repair.
The cleanout also helps prevent damage before it spreads. When a clog forms deep in the line, wastewater can back up into bathtubs and sinks, eventually rising through floor drains. This is a concern because raw sewage can carry harmful bacteria and ruin flooring and drywall when it spills indoors, often requiring professional sewage cleanup service.
Routine access to the cleanout also enables regular maintenance. Plumbers can run video inspections to check for root intrusion or developing blockages, well before a clog becomes an emergency. Catching problems early usually means a simple cleaning instead of a major repair. For homeowners, a working cleanout translates into lower service costs and reduced risk of property damage.
Common Sewer Cleanout Problems
Even with a cleanout in place, problems can develop over time. Common issues with a clogged sewer line:
- Accumulated debris: Grease, hair, food particles, and so-called “flushable” wipes are frequent culprits. Once these materials accumulate inside the pipe, they restrict water flow and eventually cause a complete blockage.
- Tree root intrusion: Roots find their way into pipe joints in search of moisture, then expand over time until they crack the pipe or block flow entirely. They can be especially problematic in homes with clay or cast-iron sewer lines. Plumbing professionals can conduct a video inspection through the cleanout to confirm root intrusion and guide treatment.
- Loose or broken cleanout caps: If your cleanout cap is in disrepair, it can allow stormwater and debris into the line, leading to backups or contamination. Older metal caps may corrode and seize in place, while newer caps may be buried under landscaping or fresh paving. Both situations make the cap difficult to access during an emergency.
Sewer line collapse is less common but it’s the most serious problem on this list. A cracked or broken pipe typically requires excavation and replacement.
How to Maintain Your Sewer Cleanout
Maintaining your sewer cleanout doesn’t require much effort, but a few simple habits go a long way:
- Start by keeping the cap accessible: Clear away yard debris around outdoor cleanouts so the cap stays visible and accessible. Indoor caps should remain unobstructed.
- Inspect the cap once or twice a year: Look for cracks or signs of corrosion. Replace damaged caps promptly to keep contaminants out of the line. A properly seated cap should screw on snugly without forcing it.
- Schedule a professional sewer line inspection: It’s best to have an inspection done every few years, more often for older homes or properties with mature trees nearby. A camera inspection can detect root intrusion and small cracks before they become emergencies. Many plumbers also offer preventive cleaning that flushes out buildup before it causes a clog.
Finally, document the location. Snap a photo of the cleanout next to a permanent landmark, or mark it on a simple property sketch. That five-minute task can save hours of searching during a midnight plumbing emergency.
Tips for Sewer Cleanout Clog Prevention
The best way to deal with a sewer cleanout clog is to avoid one in the first place:
- Avoid pouring grease or cooking oil down the drain: These substances solidify as they cool and stick to the inside of your pipes, gradually narrowing the passage until water can barely get through. Use a sealed container for grease disposal and toss food scraps in the trash, not the disposal.
- Be mindful of what you flush: In the bathroom, the toilet is the most common point of failure. Despite the marketing, most “flushable” wipes don’t break down like toilet paper. Avoid flushing wipes, paper towels, dental floss, cotton swabs, feminine products, and similar items. Toilet paper and human waste should be the only things heading down your toilet.
- Landscape responsibly near sewer lines: Large trees with aggressive root systems can damage underground pipes over time. If you’re planting near the path of your sewer line, choose smaller species or shrubs with shallow root structures.
Finally, consider an annual sewer line cleaning, particularly for older homes. A preventive treatment costs far less than emergency repair work and can extend the life of your plumbing system by years.
Let SERVPRO Handle Your Dirty Work
A sewer backup can bring problems that go well beyond standard plumbing repair. Contaminated water can damage your home and create health risks. Knowing how to find a sewer cleanout on your property gives you a head start when something goes wrong, but the cleanup work that follows a sewage spill calls for professional attention.
SERVPRO is Here to Help. Our IICRC-certified technicians provide 24-hour emergency service for sewage backups and the water damage restoration work that follows. Each SERVPRO franchise is independently owned and operated, with locations across the United States and Canada.
Find your local SERVPRO and let us make it “Like it never even happened.”
FAQs
How many cleanouts does a house have?
Most single-family homes have at least one main sewer cleanout. Larger or more complex homes may have several, including indoor cleanouts at junctions along the main waste line.
Where are sewer cleanouts located?
Outdoor cleanouts usually sit within a few feet of the foundation along the main sewer line. Indoor cleanouts are most often found in basements, crawl spaces, or utility rooms.
What does a sewer cleanout look like?
A sewer cleanout is typically a short, capped pipe that’s three to four inches wide, with a hexagonal or square cap made of plastic or brass.
Can I clear a sewer cleanout myself?
Minor clogs can possibly be handled on your own with a household drain auger. Tree roots, deep blockages, or recurring backups call for a licensed plumber, and any raw sewage spill requires professional cleanup.