Root pruning, replacement of old dilapidated pipes, concrete encasing or use of root barriers may solve the problem where tree roots have caused a blocked pipe.
If the damage is serious and recurring, the tree may be supported for removal. You will need to apply for a Tree Permit to remove the roots surrounding the pipe, or if necessary, the entire tree.
Evidence would need to be provided with a tree permit application. A sewer diagram and a comprehensive report prepared by a licensed plumber will enable Council's assessment process to be expedited.
Note: You may prune or remove a Populus sp. (Poplar), Salix sp. (Willow), Cinnamomum camphora (Camphor Laurel) and Liquidambar styraciflua (Liquidambar) without consent where the trunk of such a tree is located within 5m of any sewer.