A clogged sewer line can cause significant inconvenience and potential damage to your home. Recognizing the signs of a blockage early is crucial to prevent further issues and expensive repairs. From slow drains to unusual odors, understanding the common indicators of a clogged sewer line can help you address the problem promptly.

This guide on how to know if sewer line is clogged will walk you through the key warning signs and provide tips on what to do if you suspect your sewer line is blocked.
Why Do Sewer Lines Get Clogged?
Before we delve into the signs of a clogged sewer line, it’s essential to understand why this happens in the first place. Sewer lines can become blocked due to various factors, including:
Tree Roots:
Trees and shrubs planted near underground sewer lines can cause blockages as their roots grow and penetrate through small cracks or joints in the pipes.
Flushed Items:
Flushing items like paper towels, diapers, and feminine hygiene products can lead to clogs in the sewer line. These materials do not break down as quickly as toilet paper and can accumulate over time, causing blockages.
Grease and Oil Buildup:
Grease and oil from cooking can solidify inside sewer pipes, trapping other debris and resulting in a clogged line. It’s essential to dispose of cooking grease properly to avoid this issue.
Now that we understand some common causes of clogged sewer lines, let’s look at how to know if your sewer line is blocked.
Needed Materials
Plunger:
A plunger is a handy tool for clearing minor blockages in your sewer line. It creates suction that can dislodge debris and allow it to flow through the pipes.
Drain Snake:
A drain snake, also known as an auger, is a long flexible wire with a corkscrew end used to break up and remove blockages in pipes.
Sewer Camera:
If you suspect you have a severe blockage or damage to your sewer line, hiring a professional plumber with a sewer camera can help identify the issue accurately.
8 Step-by-step Guidelines on How to Know if Sewer Line is Clogged
Step 1: Check Your Toilets
The first place to check for signs of a clogged sewer line is your toilets. Toilets are most directly connected to the sewer line and are often the most affected when there’s a blockage. Look for symptoms such as slow flushing, bubbling water, or backups after flushing.

If multiple toilets in your home are experiencing these issues simultaneously, it’s a strong indicator of a main sewer line clog. Pay attention to any unusual sounds or persistent problems, as they may point to a more severe blockage requiring immediate attention.
Step 2: Inspect Other Drains
After checking your toilets, inspect other drains in your home, such as sinks, showers, and bathtubs. A clogged sewer line often impacts multiple drains simultaneously. Look for slow-draining water, gurgling sounds, or backups in these fixtures.
For instance, if running water in your sink causes your shower drain to bubble or back up, it could indicate a blockage further down the sewer line. Observing these patterns across multiple areas of your home can help confirm that the issue is not restricted to a single pipe but likely involves the main sewer line.
Step 3: Smell for Strange Odors
A clogged sewer line can cause unpleasant smells to emanate from your drains. If you notice a persistent foul odor in your bathroom, kitchen, or laundry room, it could be a sign of a blockage. The smell is often described as resembling rotten eggs and may intensify when you run water down the drain.
To confirm that the odor is coming from your drains and not elsewhere in your home, try sniffing around different fixtures. If you detect the smell at multiple locations, it’s likely related to your sewer line.
Step 4: Check Your Cleanout Line
A cleanout line is an access point on your property where a plumber can clear blockages in your sewer line. It’s usually located near the foundation of your home and is marked with a cap or cover. If you have one, remove the cap and inspect for any signs of backup or overflowing water.

If there’s water present, it could indicate that your sewer line is clogged and has reached this point. You may need to call a professional plumber to clear the blockage further down the line.
Step 5: Look for Sewage Backups
A severe clog in your main sewer line can cause sewage backups into your home through drains, toilets, or even cracks in basement floors. This situation requires immediate attention as it can pose health hazards and cause significant damage to your property. Contact a plumber immediately if you notice any sewage backups in your home.
You can also check your basement for any signs of water damage or unusual smells, which could indicate a sewage backup.
Step 6: Observe Your Yard
If you notice standing water or unusually green patches in your yard, it may be due to a clogged sewer line. Sewage backups and leaks from the mainline can cause wastewater to seep into your lawn, resulting in soggy spots and faster plant growth. If you suspect this is happening, contact a plumber right away to investigate the issue.
It’s also essential to pay attention to any sinkholes or depressions in your yard, as they could indicate a damaged sewer line.
Step 7: Monitor Your Water Bill
A sudden and unexplained increase in your water bill could indicate a problem with your sewer line. While a clogged sewer line itself may not directly cause higher water usage, leaks or damage associated with the blockage can lead to water wastage. If you notice a spike in your bill without any significant changes in your household water usage, it may be worth investigating further.

Compare your recent bills to previous ones to identify any unusual patterns. If accompanied by other signs of a blocked sewer line, this could mean you need to call a professional plumber to assess the situation.
Step 8: Get Professional Help
If you’ve gone through these steps and are still unsure whether your sewer line is clogged, it’s best to call a professional plumber for assistance. They have the necessary tools and expertise to diagnose and fix any issues with your sewer line.
Ignoring a clogged sewer line can lead to significant damage and costly repairs over time, so it’s crucial to address the issue promptly. By being aware of the signs of a blocked sewer line and knowing when to seek professional help, you can keep your home’s plumbing system running smoothly. Additionally, practicing proper maintenance habits such as avoiding flushing inappropriate materials down drains, can help prevent future clogs in your sewer line.
Following these guidelines on how to know if sewer line is clogged can help you determine if your sewer line is clogged and take the necessary steps to resolve the issue. Remember, when in doubt, always consult a professional for assistance. So, stay informed and be proactive to keep your home’s plumbing system functioning at its best. Happy plumbing!
How Much Will It Cost if You Use Professional Plumbers?
The cost of hiring a professional plumber to address a clogged sewer line can vary widely depending on the severity of the blockage, the location of the clog, and the methods required to resolve the issue. On average, you can expect to pay anywhere from $150 to $500 for basic drain cleaning services using tools such as a plumbing snake or hydrojetting.

If the clog is severe and requires more extensive work, such as digging to access and repair the sewer line, the cost can range from $1,000 to $4,000 or more, depending on the amount and complexity of the labor involved. Additionally, if the sewer line is damaged and needs to be replaced, the expenses could increase to $7,000 or higher.
Other factors that may influence the total cost include emergency service fees, additional inspections (like using a sewer camera to locate the problem), and whether the plumber is required to repair or replace any surrounding property, like landscaping or flooring.
It’s always a good idea to request multiple quotes from reputable plumbers in your area and inquire about any warranty or service guarantees. While professional services can be costly, addressing the problem promptly can prevent far more expensive damages in the long run.
Frequently Asked Questions
Q: Can a Clogged Sewer Line Fix Itself?
A: No, a clogged sewer line will not resolve itself and requires professional assistance to be cleared. Ignoring a clogged sewer line can lead to further damage and costly repairs in the future.
Q: What Causes a Sewer Line to Become Clogged?
A: A variety of factors can contribute to a clogged sewer line, including flushing inappropriate materials down drains, tree root intrusion, aging pipes, and other plumbing issues.
Q: How Can I Prevent Future Clogs in My Sewer Line?
A: Regular maintenance practices such as avoiding flushing inappropriate materials down drains and scheduling professional drain cleaning services can help prevent future clogs in your sewer line. Additionally, addressing any plumbing issues promptly can also prevent further damage to your sewer line.
Conclusion
Dealing with a clogged sewer line can feel overwhelming, but understanding the signs, causes, and potential solutions can help you address the issue promptly and effectively. Regular maintenance and mindful practices, such as avoiding flushing inappropriate items and scheduling routine inspections, can go a long way in preventing sewer line clogs.
When in doubt, always consult a professional plumber to protect your home and ensure your plumbing system remains in optimal condition. Investing in timely interventions and professional assistance can save you from costly repairs and provide peace of mind. Take proactive measures to keep your sewer line clear and your plumbing functioning efficiently. Thanks for reading this article on how to know if sewer line is clogged.
About the Author
Adrian Green is a passionate woodworking enthusiast who has dedicated his life to the craft of woodworking. From his early days working alongside his father in the family woodworking shop, Adrian has honed his skills and developed a deep love for creating beautiful, functional pieces with his hands. As the voice behind The Woodenify Blog, he shares his knowledge, tips, and inspiration with fellow woodworkers of all skill levels, helping them build confidence in their abilities while learning new techniques.
Professional Focus
- Specializes in DIY woodworking projects, from furniture making to home décor.
- Provides step-by-step guides, tips, and practical tutorials for woodworkers at any skill level.
- Focused on empowering readers with confidence and knowledge through easy-to-follow instructions and hands-on techniques.
- Passionate about building a community where makers can share, learn, and grow together in the world of woodworking.
Education History
University of Craft and Design – Bachelor of Fine Arts (BFA) in Woodworking and Furniture Design
Woodworking Apprenticeships – Gained extensive hands-on experience through various workshops and mentorships with seasoned craftsmen, refining carpentry and furniture-making skills.
Expertise
- DIY woodworking, carpentry, furniture making, and home décor projects.
- Creating clear, accessible tutorials and guides for beginner to advanced woodworkers.
- Helping readers experience the satisfaction and fulfillment of turning raw materials into stunning finished products.