Warning Signs That Tree Roots Are Blocking Your Drains

Tree roots are one of the most common causes of serious drain blockages in older homes. In Burwood and across Melbourne’s eastern suburbs, we regularly inspect properties where tree roots have entered sewer lines through small cracks or loose pipe joints.

In this blog, our plumbers in Burwood explain the warning signs of tree roots blocking drains. Learn how root systems enter pipes, and what is involved in properly and safely clearing blocked drains and tree roots.

If you suspect tree roots are blocking your drains, speak with a trusted local plumber before it gets worse. Call 03 9877 5775 or submit an enquiry to book an inspection.

How tree roots enter sewer lines

Tree roots do not break into pipes for no reason. They are attracted to moisture and nutrients. Even a small crack in a sewer line or loose pipe joint can release vapour into the surrounding soil. Roots follow this moisture source and push through weak points.

Older earthenware pipes are particularly vulnerable. Over time, shifting soil and natural wear create gaps. Once roots enter the drain, the root system expands inside the pipe. It catches toilet paper, grease, and other debris. This quickly turns a minor issue into a blocked drain.

PVC pipes are more resistant, but if joins are poorly sealed or damaged, they are still at risk.

Early signs of tree roots blocking drains

Blocked drains caused by tree roots usually develop gradually. Common signs include:

• Slow-draining sinks, showers, or toilets
• Gurgling noises after flushing or running water
• Unpleasant smells from floor wastes or fixtures
• Water is backing up in multiple fixtures
• Recurring blockages that return after clearing
  

Unlike simple grease build-up or other items you should not put down your drains, root-related blockages often affect more than one fixture because they interfere with the main sewer lines.

Why home remedies will not fix root blockages

Many homeowners attempt boiling water, baking soda, or chemical drain cleaners. These methods may help with surface grease but will not remove an established root system inside a pipe.

In fact, repeated use of chemical drain cleaners can damage your pipes, especially in older plumbing systems.

Tree roots inside drains require mechanical removal. A professional drain machine is used to cut and clear the roots from drains without damaging the surrounding pipework.

What happens if tree roots are left untreated

If tree roots blocking drains are ignored, the blockage worsens. The root mass thickens, trapping more debris. Over time, pressure inside the pipe can increase.

This can lead to:

• Sewer backups inside the home
• Overflowing outdoor gullies
• Cracked or collapsed pipes
• Costly excavation work

In severe cases, pipe relining or full pipe replacement may be required.

Pipe relining is often a long-term solution. It creates a new internal lining inside the existing pipe, sealing entry points and preventing future root intrusion.

It is also worth noting that some DIY drain fixes can actually make root blockages worse, especially when harsh chemicals or unsuitable tools are used, which is why plumbers don’t recommend them.

How plumbers diagnose root intrusion

Professional diagnosis begins with assessing affected fixtures and checking available drain access points. In many cases, a blockage can be identified and cleared without advanced inspection.

CCTV drain camera inspections are more expensive and are usually recommended only if our drain machine is unable to clear the blockage or if the property has recurring drainage issues that require further investigation.

Blocked drains caused by tree roots are typically cleared using a professional drain machine fitted with a snake and cutting attachments. This allows us to cut through root intrusion and restore proper flow without unnecessary excavation.

If structural damage is identified, excavation and repair of the broken section may be required. Pipe relining is an option when sewer or stormwater drains are extensively damaged across multiple areas, but it is a significant investment and is only recommended when warranted.

In some situations, you can safely try a few basic steps before calling a blocked drain plumber, but tree root blockages usually require professional equipment to clear properly.

Can you prevent tree roots from entering drains?

You cannot control how a root system grows underground, but you can reduce risk:

• Avoid planting large trees close to sewer lines
• Repair damaged pipes promptly
• Schedule periodic inspections if your home has older plumbing
• Act quickly at the first sign of a blocked drain

Regular maintenance is more affordable than emergency excavation. 

Need help clearing blocked drains due to tree roots?

Book a professional drain inspection today. Tree roots blocking drains will not fix themselves. Early action prevents damage to your sewer lines and protects your home.

If you suspect root intrusion or have recurring blockages, speak with an experienced licensed plumber. Call 03 9877 5775 or submit an enquiry to arrange a professional drain inspection and root removal service.