Signs You Have Tree Roots in Your Pipe & How to Remove Them
Tree roots enter your sewer pipe through small cracks or loose pipe joints, then continue to grow until they restrict or completely block the flow of wastewater. But identifying the warning signs early helps you address the root cause before it leads to major pipe damage, sewage backups, or more expensive repairs. In this guide, we’ll share with you the common signs of tree roots in pipes, how to confirm the problem, DIY and professional removal methods, and the best ways to prevent tree roots from growing back. TL;DR Signs You May Have Tree Roots in Your Pipes Indoor Warning Signs Outdoor Warning Signs How to Confirm Tree Roots in Pipes Tree roots grow inside underground pipes, so you can’t confirm the problem by looking at your drains or yard. A licensed plumber uses specialised equipment to locate the root intrusion, assess the pipe’s condition, and recommend the most suitable repair method. Here is what a plumber does: DIY Methods to Remove Tree Roots from Pipes Under the Queensland Plumbing and Drainage Act 2018, only a licensed plumber can repair, replace, alter, or dismantle sanitary drainage pipes. But you can use a few non-invasive DIY methods to control minor tree root growth inside the pipe. These methods don’t involve repairing or altering the pipe, so you stay within the law. Copper Sulphate Treatment Copper sulphate kills the fine feeder roots that have grown through cracks or pipe joints. As the roots die, they gradually break down and wash away with normal wastewater flow, improving drainage. How to use it: This method only works when wastewater can still flow through the pipe because a complete blockage prevents the treatment from reaching the tree roots. Commercial Foaming Root Killers Foaming root killers release a foam that expands to fill the pipe. The foam sticks to the pipe walls and joints, coating the roots growing from the top and sides, and the active ingredient then kills the fine roots. How to use them: Foaming root killers work best on early root intrusion. They won’t clear a pipe clogged with thick roots or fix cracks that let roots keep growing back. Household Drain Auger A household drain auger is a flexible steel cable with a corkscrew tip that breaks up or pulls out fine tree roots and loose root fibres from the pipe. It works best on small root intrusions close to an inspection opening but isn’t powerful enough to clear large root masses or collapsed pipes. How to use it: Stop immediately if the cable becomes stuck or you feel excessive resistance. Forcing the auger may crack older earthenware pipes or cause the cable to become trapped. Professional Methods to Remove Tree Roots From Pipes If wastewater is overflowing from your overflow relief gully (ORG) or inspection opening, or backing up into your home, the blockage is too severe for DIY chemical treatments. At this stage, a licensed plumber will use the following methods to remove the roots. Mechanical Root Cutting (Drain Eel/Snake) A plumber feeds a heavy-duty rotating steel cable into the sewer pipe using a powered drain machine. A specialised root-cutting blade or C-cutter attached to the cable spins through the tree roots, cutting them into smaller pieces and reopening the pipe. Mechanical root cutting typically costs $150 to $350 for a standard residential drain blockage. It works best for thick tree roots causing localised blockages in clay, cast-iron, or PVC sewer pipes. However, root cutting only removes the blockage. It doesn’t repair the cracks or separated pipe joints that allowed the roots to enter, so roots often grow back. The cutting blades can also damage old, brittle earthenware pipes. High-Pressure Hydro Jetting After mechanical root cutting, plumbers use hydro-jetting to remove any remaining root fibres, grease, sludge, and debris. A hydro-jetting machine pumps high-pressure water through a reinforced hose to clean the entire inside of the pipe. Hydro jetting typically costs $300 to $600 for a standard residential blockage, depending on the severity of the blockage and access to the pipe. Like root cutting, hydro jetting removes the blockage but doesn’t seal cracks or damaged pipe joints, allowing tree roots to return through the same openings. Our team at 1touch Plumbing uses professional equipment to clear blocked drains, remove tree roots, and restore normal wastewater flow. How to Prevent Tree Roots From Growing Back in Pipes To prevent future root intrusion, we recommend one of the following long-term solutions. Trenchless Pipe Relining After removing the tree roots, a plumber inserts a flexible liner coated with structural epoxy resin into the damaged pipe. The liner is inflated and cured in place, creating a seamless pipe inside the existing one that seals cracks and separated joints. Most residential pipe relining projects cost $4,000 to $12,000. It is the best option for pipes beneath driveways, buildings, patios, or landscaped areas where excavation would be costly or disruptive. To confirm relining suits the extent and type of damage, our team at 1Touch runs a CCTV inspection first, then carries out the trenchless pipe relining. Traditional Excavation and Pipe Replacement If the pipe has collapsed or tree roots have caused extensive damage, plumbers excavate the affected area, remove the damaged pipe and root mass, and install new PVC sewer pipe with watertight joints. Simple pipe replacements start from $1,000, while larger or more complex excavations cost significantly more. Excavation may also require repairs to lawns, gardens, paving, or driveways after the new pipe is installed. Although excavation and replacement is the most disruptive option, it permanently removes the damaged pipe and eliminates the entry points that allowed tree roots to invade. Root Barrier Installation A plumber installs a root barrier between the tree and the sewer pipe to redirect growing roots away from the drainage system and protect repaired or newly installed pipes. Professional installation typically costs $200 to $300 per linear metre, depending on the barrier type, trench length, and site conditions. They work best where large trees are close to underground sewer









