Dealing with Tree Roots in Drains
Tree roots near sewer pipes
Tree roots search out sources of water, the fine filaments of root can easily grow in to the joints of your drainage system. As the roots continue to grow the joint fails, which can lead to infiltration of your system by surface water and the loss of carrying capacity in your drain as the roots expand in to the space. Blockages and surcharging can then occur. Ultimately roots can cause the fracture of the drains.
Cutting of the roots can temporarily re-establish carrying capacity but roots will always grow back in to the voids created by the earlier root invasion. We re-line or relay affected sewers to stop the problem recurring.
If you want to plant some trees near your drainage system remember that tree roots tend to grow towards sources of water such as drains and sewer pipes. If you are landscaping near sewers you can save yourself future problems and money by choosing trees with deep root systems.
Try to dig a hole deep enough to get below heavy clay soils. If the hole is too shallow the tree's roots will spread horizontally. The tree won't be healthy, and neither will your sewer system.
Water 
Sewerage 
