Sewer line backup in your home is a clear sign of a clog in your main sewage system, and it is not something to leave unattended. Because household wastewater carries microorganisms, a clogged main line or sewer backup is a health and safety issue for you and your family, not just an inconvenience.
Shut Off the Main Water Line First
To keep a sewer line clog from becoming unmanageable, shut off the main water line to your property as soon as you notice standing water backing up. It will interrupt your day, but it is the fastest way to stop the problem from getting worse. Once the water is off, contact a licensed plumber — the sooner a technician diagnoses and treats the clog, the sooner things are back to normal.
Related reading: How to Unclog a Bathroom Sink Drain and How to Unclog a Kitchen Sink Drain.
Find the Main Water Shut-Off Valve
In residential homes, there is no single standard location for the main water shut-off valve. Start by locating your water meter — the shut-off valve is usually close to it. In colder climates, the water line typically enters through a hole in the foundation; follow the pipe from there to find the meter and valve, then close it tight.
In warmer climates, the meter is often installed outside near an exterior faucet. If shutting off the water inside your home does not help, try the shut-off valve at the street meter instead. You will need a crescent wrench and a screwdriver: lift the ground cover with the screwdriver, then close the main supply valve with the wrench.
Determine What Your Options Are
Before starting any repair, try to identify the actual cause. It might be something as minor as hair caught in a drain, or as significant as tree roots infiltrating your sewer line. Sometimes the issue is on the city’s side of the connection — for example, water flowing up from a manhole near your property is a sign to contact your city’s public works department rather than a plumber.
If you notice a clog while there is standing water present, avoid pouring in a liquid drain cleaner. These products are highly caustic and can be harmful to both your plumbing and to you. The EPA’s septic system care guidance covers what does and doesn’t belong in your drains, whether or not you’re on a septic system.
Get a Specialist to Solve the Problem
The 5 Star Plumbing’s licensed plumbers bring the right tools and experience to every sewer line backup call. When our technicians arrive, they typically start with a camera inspection to pinpoint the exact cause — a crushed pipe, a foreign object, or tree roots are all common culprits.
Once the cause is identified, the fix depends on severity. Minor clogs are often cleared with a cable that breaks through the obstruction and restores flow. More serious blockages may call for trenchless sewer line repair, which fixes or replaces damaged pipe without digging up your yard.
Frequently Asked Questions
How do I know if it’s a sewer backup and not just a clogged drain?
A single slow drain is usually a local clog. If multiple fixtures back up at once, or water surfaces from a floor drain or the lowest fixture in the house, that points to a main sewer line backup that needs professional attention.
Is a sewer line backup covered by insurance?
Coverage varies by policy. Many standard homeowners policies exclude sewer backups unless you’ve added a specific sewer/drain backup rider, so it’s worth checking your policy before you need it.
Can tree roots really cause a sewer backup?
Yes. Tree roots are drawn to the moisture and nutrients inside sewer pipes and can work their way into small cracks or joints, eventually causing major blockages or pipe damage.
At The 5 Star Plumbing, We Have the Experts You Need
The 5 Star Plumbing is dedicated to providing homeowners with high-quality plumbing services at a reasonable cost. We can diagnose a wide range of plumbing issues and fix most of them the same day.
If you’re having trouble with your main sewer line, contact us anytime or leave us a message online, and we’ll send an expert right away.
