If your stormwater drain is overflowing, draining slowly, or backing up every time it rains, tree roots might be the culprit. It’s a common problem in many Australian homes, especially in older suburbs with mature trees and ageing pipes. Left untreated, it can lead to serious flooding, property damage, and costly repairs.

Here’s what you need to know about stormwater drain tree root issues and the steps you can take to fix them.

Why Tree Roots Invade Stormwater Drains

Tree roots are naturally drawn to moisture. If your stormwater pipes have even a tiny crack or loose joint, roots will find their way inside to access water and nutrients. Over time, they grow thicker, creating a tangled blockage that stops water from flowing freely.

This is particularly common in:

• Clay or concrete pipes with worn joints or cracks
• Older properties where pipes have never been replaced
• Gardens with large trees planted close to the drainage system

Signs You Have a Tree Root Problem in Your Stormwater Drain

Look out for these warning signs:

• Water pooling around downpipes after rain
• Stormwater pit or gutter water draining slowly
• Overflowing grates or gullies during heavy rainfall
• Gurgling or bubbling sounds from stormwater drains
• Frequent blockages that clear but keep coming back

What to Do if You Suspect Tree Roots in Your Stormwater Drain

1. Stop Using the Drain (If Possible)

If you keep allowing water into a blocked stormwater system, you risk flooding your yard or damaging nearby structures. Limit water flow until the blockage is cleared.

2. Call a Licensed Plumber with a Drain Camera

Stormwater drains are different from sewer pipes and require the right tools to inspect and clear. A professional plumber can:

• Use a CCTV drain camera to confirm if roots are the problem
• Pinpoint the exact location of the blockage
• Check the overall condition of the pipe to see if repairs are needed

3. Remove the Roots with a Drain Machine or Hydro Jet

For small root intrusions, plumbers often use:

• Mechanical drain cleaning machines to cut roots away
• High-pressure hydro jetting to flush roots and debris out of the pipe

This restores water flow, but it’s usually only a temporary fix unless the damaged section of pipe is repaired.

4. Repair or Replace the Damaged Pipe

Once roots have made their way into your stormwater system, they will come back unless the entry point is sealed. Permanent solutions include:

• Pipe relining: Creates a new, smooth pipe inside the old one without digging
• Pipe replacement: Removes the damaged section entirely
• Joint sealing: Prevents roots from entering through small gaps

5. Prevent Future Root Problems

After fixing the damage, you can reduce the risk of a repeat problem by:

• Avoiding planting large trees near stormwater lines
• Choosing slow-growing, non-invasive plants for garden beds above pipes
• Scheduling annual drain inspections to catch early signs of root intrusion

When to Call a Plumber Immediately

You should get professional help straight away if:

• Your stormwater drain backs up during light rain
• There’s flooding near your home or structures
• Water is seeping into your house or garage
• You hear gurgling from multiple drainage points

Final Thoughts

Tree roots in stormwater drains are a common but serious issue. While you might be able to temporarily improve water flow with a DIY clean, the only way to prevent it from happening again is to have a plumber inspect, clear, and repair the damage. Acting early will save you from more costly repairs and keep your property safe during heavy rainfall.