Tree Roots in the Sewer Line: Why It Happens & What To Do

How Roots Get Into a Sewer Pipe in the First Place

Tree roots don't smash their way into pipes. They're guided in. A sewer lateral — the buried pipe carrying wastewater from your house to the city main — is warm, wet, and full of nutrients, and tiny amounts of moisture vapor escape through any joint or hairline crack. Roots grow toward that vapor trail with remarkable precision. A root tip the width of a hair slips into a joint, finds everything a tree could want, and thickens. As it grows, it wedges the joint open wider, letting in more roots.

Inside the pipe, roots spread into a fibrous mat that works like a net across the flow. The net catches paper, grease, and solids, and a pipe that flowed fine for decades starts backing up. Meanwhile the mechanical damage compounds: expanding roots crack pipe walls, shift sections out of alignment, and in advanced cases crush or collapse the line entirely. What began as a hairline entry ends as a structural failure.

Why Glendale & Burbank Homes Get Hit So Often

Two local facts collide underground here. First, the housing: most of Glendale and Burbank was built between the 1920s and the 1960s, when sewer laterals were made of vitrified clay in short segments — meaning a joint every few feet, and every joint a potential doorway. Clay pipe itself can last a century, but its joints were sealed with materials that have long since deteriorated.

Second, the trees. The camphors, ficus, and oaks lining streets in Verdugo Woodlands, Rossmoyne, Magnolia Park, and the Rancho Equestrian District are one of the region's great charms — and among the thirstiest, most aggressive root systems commonly planted. A mature ficus can send feeder roots far beyond its canopy. Put 60-to-100-year-old clay joints within reach of those roots, and intrusion isn't a risk; it's close to a schedule. It's the signature sewer problem of both cities, and the reason camera inspections here so often find the same story a few feet down.

Warning Signs: The Typical Timeline

Root intrusion announces itself gradually. Most homeowners we meet have seen the early stages without recognizing them:

1. An Occasional Slow Drain

   The lowest drains in the house — a tub or shower — drain sluggishly now and then, then seem to recover. The root mat is small and water still finds its way through.

2. Gurgling & Odors

   Toilets gurgle when the washing machine drains; a faint sewage smell appears in the yard or bathroom. Air is trapping behind a growing obstruction.

3. Seasonal Backups

   Backups arrive with rain or with spring growth, then respond to clearing — for a while. Roots regrow from the cut ends every time, usually faster than before.

4. Full Stoppage

   Nothing drains, and wastewater rises in the tub or floor drain. At this stage the mat spans the pipe, and there's often structural damage behind it.

The earlier in this timeline you act, the more options you have — and the cheaper they are.

Your Options, From Quick Fix to Permanent Fix

There's a ladder of treatments for roots in a sewer line, and an honest plumber will tell you what each rung actually accomplishes.

Mechanical root cutting

A cutting head on a sewer machine slices through the root mat and restores flow, usually the same day. Understand what it is: mowing the lawn. The roots are cut, not removed, and the openings they entered through are untouched. Regrowth typically brings the problem back within months to a couple of years. It's the right call for restoring service fast and buying time to decide.

Hydro jetting

High-pressure water scours roots off the pipe wall far more thoroughly than a blade, clearing fine root hairs and buildup a cutter leaves behind. As part of our drain cleaning service, jetting delivers the deepest reset short of repair — but it's still a reset, not a cure, and in fragile pipe it must be used judiciously. A camera check first tells us whether the pipe can take it.

Chemical root treatments

Foaming herbicides can kill root tissue inside the pipe and slow regrowth when applied properly after clearing. They won't dissolve an established mat, do nothing for the pipe's structure, and their effect fades. Think of them as a supplement to clearing, never a substitute for repair.

Spot repair

When the camera shows damage confined to one or two sections, excavating and replacing just those sections can be the proportionate fix. It's real repair at a fraction of full-replacement cost — the caveat is that the rest of the old clay line keeps aging, joint by joint.

Full lateral replacement

The permanent answer: replace the clay line with modern, joint-minimal pipe that gives roots no way in. Trenchless methods — pulling a new pipe through the path of the old one — often make this possible without digging up the whole yard, which matters on established landscaping and hillside lots. Our sewer and main line replacement page covers the methods in detail. This is the busiest category of major work we do: sewer line replacement in Glendale leans heavily trenchless because of hillside laterals in Adams Hill and Chevy Chase Canyon, while sewer line replacement in Burbank is dominated by root-riddled postwar laterals under mature street trees.

The Camera Inspection: How You Decide

Every option above depends on facts you can't see from the surface: where the roots enter, how many joints are compromised, whether the pipe is cracked, bellied, or collapsed. A sewer camera answers all of it in under an hour, with footage you watch yourself. That's why we run a camera before recommending anything beyond a basic clearing — it's the difference between choosing a repair and gambling on one. If a plumber proposes replacing your lateral without showing you camera footage, get a second opinion.

Can You Prevent Root Intrusion? Some Honesty

Partially. You can avoid planting thirsty, aggressive species near the lateral's path, water deeply but less often so roots grow down instead of sideways, and schedule preventive clearing or jetting if you know your line has minor intrusion. What you can't control: the city-owned street trees doing most of the damage, the 80-year-old joints already in your yard, or a neighbor's ficus. Prevention delays the reckoning for an old clay lateral — it rarely cancels it. The good news is that once a line is properly replaced, the problem is genuinely over; modern materials give roots nothing to exploit.

Backing up right now, or tired of the annual clearing ritual? Call (818) 242-7878 — we'll clear the line, camera it, and lay out your options with flat, upfront pricing and zero pressure.