How to Prevent Tree Root Intrusion in Sewer Pipes

Tree roots are drawn to sewer lines. Warm water flowing inside the pipes releases moisture vapor, which leaks into the surrounding soil through small joints or cracks. Tree roots seek out these moisture sources and invade the pipe, causing clogs and collapses.

Root intrusion is the leading cause of residential sewer line failure. Fortunately, there are several steps you can take to prevent tree roots from destroying your plumbing:

1. Plant Trees Away from Sewer Lines

Before planting new trees or shrubs, locate your underground utility lines. Avoid planting deep-rooted trees within 10 feet of your sewer lateral. If you must plant near the sewer line, choose slow-growing, shallow-rooted species.

2. Use Chemical Root Inhibitors

Copper sulfate and foaming root killers can be flushed down your toilet once or twice a year. These chemicals kill roots inside the pipe without killing the tree itself. Always use environmentally safe, EPA-approved products.

3. Upgrade to Seamless Pipes

Older clay and cast iron pipes have joints every few feet, making it easy for roots to slip inside. Upgrading to modern seamless pipes, such as trenchless epoxy pipe liners or HDPE piping, eliminates joints entirely, making root intrusion virtually impossible.