Tree Roots in Your Sewer Line: How They Get In and What to Do
Tree roots are the single most common cause of recurring sewer backups in older Bay Area neighborhoods. They are not random — roots actively seek the moisture and nutrients inside a sewer line, and aging pipe gives them a way in.
How Roots Get In
Roots do not bore through solid pipe. They enter through existing openings — the joints between clay sections, small cracks, or offset connections. Once a root finds moisture, it grows into a mass that traps debris, restricts flow, and eventually blocks the line completely. On a long lateral with many joints, the opportunities multiply.
Warning Signs
- Slow drains that clear temporarily and come back within weeks
- Gurgling from toilets or tubs
- Recurring backups that need repeated clearing
- A lush, unusually green patch of lawn over the lateral
The Problem with Just Clearing It
Snaking or hydro jetting cuts the roots out and restores flow — but it does not seal the crack or joint they came through. Without fixing that opening, the roots return. That is why clearing alone becomes a recurring expense.
The Lasting Fix
After we clear the line, a camera inspection shows whether the pipe is still structurally sound. If it is cracked but round, CIPP lining seals the interior and eliminates root entry points without digging. If the line is collapsed or deformed, pipe bursting replaces it entirely. Either way, you stop treating the symptom and fix the cause.