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Last Revised: 11/26/25
Is your toilet gurgling? Are multiple drains in your home suddenly slowing or backing up? If you’re asking yourself, “Why is my sewer backed up?” – you’re not alone, and you’re asking the right question.
At Mattioni, we’ve been helping homeowners with their plumbing systems for over 75 years. We specialize in diagnosing and resolving sewer line issues, from everyday clogs to full main line replacements. If your home is experiencing a sewer backup, we’re here to help you understand what’s happening and what to do next.
In this article, you’ll learn:
- The most common reasons your sewer may be backing up
- Early warning signs you should never ignore
- Exactly what steps to take right now
- How to prevent future backups and protect your home
Let’s start with a closer look at what’s causing this frustrating (and potentially hazardous) problem.
What’s Causing Your Sewer to Back Up?
If your sewer is backing up into your home, it means wastewater isn’t flowing properly out to the municipal sewer or septic system. Instead, something is forcing it to reverse direction – often into your lowest drains like the basement floor drain, shower, or tub.
Here are the most common causes:
1. A Clog In Your Main Sewer Line
The main sewer line is the pipe that carries all the wastewater from your home to the city’s sewer system. If it gets blocked, nothing can drain. Grease, “flushable” wipes, paper towels, and other non-degradable items are frequent offenders.
What it means for you: If more than one drain is acting up at once, or if water backs up in one drain when you use another, the problem is likely in the main line – not just a single fixture.
2. Tree Root Intrusion
Tree roots naturally seek out moisture. If they find even a small crack in your underground sewer pipe, they can grow inside it, eventually causing a total blockage.
What it means for you: If you have mature trees near your home or clay/cast iron pipes, roots could be the hidden culprit behind your backup.
3. Collapsed Or Damaged Sewer Pipes
Sewer pipes age just like roofs and foundations. Over time, older materials like clay, Orangeburg, or cast iron can corrode, collapse, or shift due to soil movement.
What it means for you: If you’ve had multiple backups over the years or recently noticed sunken patches in your yard, you may be dealing with a structural sewer failure.
4. Heavy Rain Or Overwhelmed Sewer Systems
During intense storms, municipal sewers can overflow, sending water – and sewage – back up into homes through the lowest entry point.
What it means for you: If your backup occurs after a storm, you may need to install a backup valve to prevent future flooding.
Warning Signs You Shouldn’t Ignore
The earlier you catch a sewer backup, the more you can avoid costly damage. Here are signs that your sewer line is struggling:
- Multiple slow drains in your home (not just one)
- Gurgling or bubbling sounds from sinks or toilets
- Foul smells from basement drains or tubs
- Water backing up when you flush or do laundry
- Soggy spots or unusually green grass in your yard
If you’ve noticed one or more of these signs, it’s time to act fast. Sewer backups don’t get better on their own – and the longer you wait, the higher the risk to your home and health.
What Should You Do If Your Sewer Is Backed Up?
If you suspect a sewer backup, here’s what you should do immediately:
1. Stop Using Water In The House
Running water will only add to the problem. Avoid flushing toilets, using sinks, running the dishwasher, or doing laundry.
2. Call A Professional Plumber Immediately
At Mattioni, we use advanced diagnostic tools like video camera inspections to locate the blockage and determine whether it’s a clog, root intrusion, or pipe failure. This allows us to recommend the right solution – whether it’s hydro jetting, root removal, or pipe repair.
3. Avoid DIY Chemical Cleaners
Store-bought drain cleaners won’t solve a main line problem and could actually damage your pipes or worsen the clog.
4. Protect Your Home
If sewage has entered your home, avoid the affected area and don’t attempt to clean it with household products – raw sewage is a biohazard. A professional remediation service may be necessary.
How to Prevent Sewer Backups in the Future
You don’t have to wait for another disaster. Here’s how to keep your sewer line clear and flowing:
- Schedule annual sewer inspections using video cameras – especially if your home is over 40 years old
- Don’t flush wipes, paper towels, or feminine products – even if they’re labeled “flushable”
- Keep grease, oil, and food scraps out of your drains
- Install a backwater valve to block municipal backups from entering your home
- Consider pipe replacement or relining if your existing pipes are aging or damaged
We offer preventative sewer maintenance services designed to spot and correct problems – early before they turn into emergencies.
You Deserve Peace of Mind – Let Mattioni Be Your Guide
Your home should be a place of comfort, not stress. If your sewer line is backing up, you need more than a quick fix. You need a long-term solution from a team you can trust.
At Mattioni, we bring over seven decades of local experience, top-tier equipment, and a homeowner-first approach to every job. We’re not just here to fix pipes – we’re here to give you answers, protect your home, and prevent future issues.
Key Takeaways:
- Sewer backups are often caused by clogs, roots, damaged pipes, or storm overloads
- Warning signs include slow drains, strange noises, foul smells, and water in places it shouldn’t be
- If your sewer is backed up, stop using water and call Mattioni for a camera inspection right away
- Prevent future problems with proactive inspections, smart drain habits, and expert help
Don’t wait for a full-blown emergency. Give us a call at (610) 400-8510 or schedule your sewer line inspection or drain cleaning with Mattioni and take the first step toward a cleaner, safer, and more reliable plumbing system.
