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Tree Roots in Your Sewer Line: Why the Clog Keeps Coming Back

If your main line backs up every year, roots are the usual suspect. Here's why they get in and how to stop them.

October 9, 2026
Illustration of tree roots growing down toward a buried sewer pipe

A drain that clears up and then backs up again a few months later is telling you something. In established Yuba City neighborhoods, that something is usually tree roots growing inside the sewer lateral.

Why roots get in

Older sewer laterals were built from short sections of clay or cast iron pipe joined every few feet. Over time those joints loosen, and a little moisture and warmth escape. Roots grow toward that water, slip through the gap and spread inside the pipe like a net. Paper and waste catch on the net and the line slows to a stop.

Warning signs

  • A gurgling or bubbling toilet when the washing machine drains
  • The lowest drain in the house backs up first
  • Backups that happen around the same time each year
  • A patch of lawn over the sewer line that stays greener than the rest

Clearing roots vs. fixing the pipe

Cutting the roots with a cable or jetter opens the line, often the same day. But the gap they came through is still there, so they grow back.

A camera inspection after cleaning shows how many joints are letting roots in and whether the pipe is cracked or sagging. If the line is otherwise sound, a trenchless liner can seal every joint at once. If it's broken or bellied, replacing that section is the permanent fix.

What you can do in the meantime

Avoid planting new trees right over the sewer line, keep wipes and grease out of the drains, and if your line has had roots before, schedule a cleaning before the season when your backups usually start.

Need help now? See our sewer line repair service in Yuba City.

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