Causes of Blocked Sewers: Identifying and Fixing Sewer Blockages

Blocked sewers can cause significant inconvenience and damage if not addressed promptly. Understanding the causes and knowing how to identify and fix these blockages is essential for maintaining a healthy plumbing system. This article will guide you through the common causes of blocked sewers, signs to watch for, practical solutions, and the costs involved in unblocking sewer pipes.

Common Causes of Blocked Sewers

Blocked sewers occur when the flow of wastewater is obstructed, leading to backups and potential damage. Several factors contribute to these blockages:

• Tree Roots Intrusion: Tree roots naturally seek out moisture and can infiltrate sewer pipes through small cracks or joints. Over time, roots grow inside the pipes, causing blockages and even pipe damage.

• Grease and Fat Build-up: Pouring cooking grease or fat down the drain causes it to solidify inside the pipes. This sticky residue traps other debris, gradually narrowing the pipe and causing blockages.

• Foreign Objects: Items like sanitary products, wipes, toys, and excessive toilet paper can clog sewer lines. These objects do not break down easily and can cause severe blockages.

• Collapsed or Damaged Pipes: Old or poorly installed pipes may collapse or crack, leading to blockages. Soil movement, heavy traffic above ground, or corrosion can cause pipe damage.

• Flushing Non-Flushable Items: Many people flush items that should not be flushed, such as wet wipes, cotton buds, or dental floss. These materials accumulate and block the sewer system.

  
  

Understanding these causes helps in preventing blockages and maintaining a smooth flow in your sewer system.

Tree roots causing sewer pipe blockage

Signs You Have a Blocked Sewer

Recognising the signs of a blocked sewer early can save you from costly repairs and health hazards. Here are some common indicators:

• Slow Draining Fixtures: If sinks, bathtubs, or toilets drain slowly, it may indicate a blockage in the sewer line.

• Gurgling Sounds: Strange noises coming from drains or toilets often suggest trapped air caused by a blockage.

• Unpleasant Odours: Foul smells around drains or in the yard can indicate sewage backing up due to a blockage.

• Water Backing Up: Sewage or wastewater backing up into sinks, toilets, or outdoor drains is a clear sign of a serious blockage.

• Lush Patches in the Yard: Excess moisture from leaking or blocked pipes can cause unusually green or soggy patches in your garden.

  
  

If you notice any of these signs, it is important to act quickly to diagnose and fix the problem.

How much does it cost to unblock a sewer pipe?

The cost to unblock a sewer pipe varies depending on the severity of the blockage, the method used, and your location. Here are some typical cost factors:

• Inspection Fees: A professional inspection using a CCTV camera to locate the blockage can cost between $150 and $400.

• Simple Blockage Removal: Clearing minor blockages with a drain snake or high-pressure water jetting usually costs between $200 and $600.

• Severe Blockages or Repairs: If the pipe is damaged or collapsed, repairs or replacement can cost from $1,000 to several thousand dollars.

• Emergency Services: Calling a plumber outside regular hours may incur additional fees.

  
  

To keep costs down, regular maintenance and early detection are key. Avoid flushing inappropriate items and dispose of grease properly to prevent blockages.

Professional sewer pipe inspection with CCTV camera

Practical Steps to Fix a Blocked Sewer

Fixing a blocked sewer requires the right tools and approach. Here are some practical steps you can take:

1. Identify the Blockage Location

   Use a drain inspection camera or hire a professional to pinpoint the blockage. This helps avoid unnecessary digging or damage.

   
   

2. Use a Drain Snake or Auger

   For minor blockages, a drain snake can be inserted into the pipe to break up or pull out the obstruction.

   
   

3. High-Pressure Water Jetting

   This method uses a powerful water jet to clear grease, roots, and debris from pipes. It is effective for stubborn blockages.

   
   

4. Chemical Drain Cleaners

   Use with caution. Some chemicals can damage pipes or harm the environment. Always follow manufacturer instructions.

   
   

5. Professional Help

   For severe blockages or damaged pipes, contact a licensed plumber. They have the expertise and equipment to safely resolve the issue.

   
   

6. Preventive Maintenance

   Regularly clean drains, avoid flushing non-flushable items, and schedule inspections to prevent future blockages.

   
   

By following these steps, you can effectively manage and fix sewer blockages before they escalate.

Preventing Future Sewer Blockages

Prevention is always better than cure. Here are some tips to keep your sewer system clear:

• Dispose of Grease Properly: Collect cooking fats and oils in a container and dispose of them in the trash.

• Avoid Flushing Non-Flushable Items: Only flush toilet paper and human waste.

• Install Drain Screens: Use screens to catch hair, food particles, and other debris.

• Regular Inspections: Schedule professional inspections every few years to detect early signs of damage or blockages.

• Tree Root Management: Plant trees away from sewer lines or use root barriers to prevent intrusion.

  
  

Implementing these practices will reduce the risk of blockages and extend the life of your sewer system.

When to Call a Professional Plumber

While some blockages can be fixed with DIY methods, certain situations require professional intervention:

• Persistent or recurring blockages

• Sewage backing up into your home

• Visible damage to sewer pipes

• Blockages caused by tree roots or collapsed pipes

• Lack of proper tools or expertise

  
  

Professional plumbers have specialised equipment like CCTV cameras, high-pressure jetters, and pipe repair tools to handle complex sewer issues safely and efficiently.

Taking timely action can prevent costly repairs and health risks associated with untreated sewer problems.

By understanding the causes of blocked sewers and knowing how to identify and fix them, you can maintain a healthy plumbing system and avoid the headaches of sewer blockages. Remember, early detection and proper maintenance are your best defence against costly repairs and unpleasant disruptions.

For more detailed information on dealing with a sewer blockage, consult a licensed professional or trusted plumbing service.