How to tell if my sewer line is partially blocked?

 
Signs of a Partially Blocked Sewer Line
 

• Slow draining water in sinks, bathtubs, and showers that persists even after clearing traps or drains.
• Gurgling or bubbling sounds coming from drains as water attempts to flow through an obstructed pipe.
• Unpleasant odors around drains or in the basement, often indicating that sewer gases are not venting properly.
• Water backup in one fixture when using another, suggesting that the exit path is impeded.

 
DIY Diagnostic Methods
 

• Conduct a simple water flow test by running water in several fixtures simultaneously to check if water backs up in one area.
• Use a drain snake or plunger on your sinks and tubs to see if you can temporarily clear the blockage, which might confirm a partial obstruction if symptoms improve.
• Observe any unusual sounds or odors when fixtures drain. These signs can indicate a slow buildup due to a blockage that is allowing only partial water flow.
• Check for wet spots or sinkholes in your yard near the sewer line; such surface problems can be caused by a backed-up sewer line leaking water underground.

 
Professional Inspection Methods
 

• Have a professional perform a video inspection of your sewer line. A small camera is threaded through the pipe, making it easier to pinpoint the location and severity of the blockage.
• Consult a plumbing specialist to conduct a smoke test, where harmless smoke is pushed through the sewer system to reveal leaks or blockages by watching where it escapes.
• Request a pressure test to assess water flow and to determine if the blockage is partial rather than complete, which helps in planning the appropriate repair method.

 
Additional Considerations
 

• Keep a record of when and where the issues occur to provide useful information for a professional diagnosis.
• Note that recurring minor blockages can eventually lead to more significant problems, so early detection and repairs are key.
• Be aware of tree root intrusions, as roots can infiltrate and gradually narrow the sewer line.
• Consider routine maintenance or cleaning if your sewer system is prone to partial blockages. This preventive approach can help avoid major clogs and costly repairs.

Homeowners in St. Louis and Nashville who notice these issues may find that periodic inspections help maintain efficient sewer system performance.