How to tell if my main sewer line is clogged?

 
Common Signs of a Clogged Main Sewer Line
 

• Sewage backups in drains, especially in multiple fixtures like sinks, tubs, and toilets.
• Water draining very slowly from multiple fixtures.
• Unexplained sewage odors coming from floor drains, the yard, or near the cleanout.
• Gurgling sounds in the plumbing when water is used elsewhere in the home.
• Frequent clogs in interior drains that recur despite drain cleaning.

 
Observations Inside Your Home
 

• Check all fixtures; if most or all are showing signs of impatience with slow drainage or partial blockages, the issue might be in the main sewer line rather than in one specific branch.
• Examine your toilets for unusual flushing behavior. Overflowing or slow-flushing toilets can be a clear indicator of blockage deeper in the system.
• Monitor sinks, bathtubs, and dishwashers. If these fixtures are draining slowly at the same time, it suggests a potential clog where the lines converge.

 
External Signs and Yard Examination
 

• If you notice wet spots or soggy areas in your yard, especially in the vicinity of your sewer cleanout or where the line exits your house, this can be a sign that water is backing up and leaking out of a clogged pipeline.
• Examine the ground around the sewer cleanout for signs of erosion or unusual moisture, which may indicate a blockage causing pressure buildup in the line.

 

In some cases, homeowners in St. Louis and Nashville have observed similar drainage issues, which underscores the importance of regular plumbing inspections.

 
Using Diagnostic Tools and Techniques
 

• Perform a water flush test: Run a large volume of water from a bathtub or sink and observe whether the water drains normally or if it backs up into other fixtures.
• Consider using a plumbing snake or auger specifically designed for sewer lines to gently probe the pipe for blockages, though proceed with caution as this may require professional intervention if the clog is severe or deep.
• If available, a video inspection tool can be inserted into the cleanout to visually check for blockage, tree root intrusion, or structural damage in the main sewer line.

 
Professional Inspection and Assistance
 

• If your observations and simple tests point toward a clog in the main sewer line, it is advisable to contact a licensed plumber. They have specialized equipment, such as hydro-jetters and high-resolution cameras, to accurately diagnose and resolve the issue.
• A professional inspection can help determine if the clog is localized or if there's a more serious structural issue that might require pipe repair or replacement.
• Regular maintenance and preventive services by professionals can help avoid future clogging and potential damage to your home's plumbing system.