Tree Roots in a Sewer Line

Old clay laterals are magnets for tree roots. Once inside, they grow into a wet, warm buffet — and grow fast.

Common causes

• Cracked or offset clay tile
• Root-hungry species (silver maple, willow, poplar)
• Small gaps at pipe joints
• No annual maintenance schedule

Step-by-step

1. 01Camera-scope to confirm root intrusion and location
2. 02Cut and clear with a root-cutting head or hydro-jetter
3. 03Consider foaming root-killer as a stopgap
4. 04Plan pipe lining or spot replacement if damage is structural

When to call Northbridge

• Roots return within 6–12 months of clearing
• Camera shows offset or broken joints
• Sewer smell in the yard
• Large tree within 15 feet of the lateral