Ficus Roots and Your Sewer Lateral: Why Los Angeles Homeowners Pay for City Tree Damage

There is a tree growing along tens of thousands of Los Angeles parkways that causes more sewer lateral damage than any other species in California. It is the Indian laurel fig, planted in enormous numbers across the city and its neighbours for its dense evergreen canopy and its tolerance of heat and neglect. It is a good street tree in almost every respect except one: its roots are relentless, and they will find your sewer pipe.

Roots do not break into sound pipe

This is the most important thing to understand, because it changes what you should do about it. A root cannot drill through intact vitrified clay or sound cast iron. What it does is locate an existing opening and exploit it. On a Los Angeles lateral that opening is almost always a clay bell joint that ground movement has worked slightly apart, or a crack from corrosion, settlement or seismic displacement.

Once a fine root finds that gap it enters the pipe, discovers a reliable supply of water and nutrients, and thickens. Over a few seasons a hair-thin root becomes a dense mat across the bore, catching everything that passes. The blockage you eventually experience is the end of a long process that began when the joint opened. That sequence tells you what cutting the roots actually achieves: it restores flow, often dramatically, but it does not close the opening they came through. They will return, because the door is still open and the tree is still thirsty.

Why California regrowth is faster than you would expect

Plumbers in Pennsylvania or Ohio can cut a root mass and reasonably expect several years of quiet. California does not work that way, because nothing here goes properly dormant. The growing season is effectively continuous, irrigation keeps gardens watered through a five or six month rainless summer, and a sewer lateral is frequently the most dependable moisture source in the ground. With a mature ficus or eucalyptus close to the line, a twelve to twenty-four month interval between cuts is realistic rather than pessimistic.

The other species worth knowing

Ficus leads, but it has company. Eucalyptus, imported to California in enormous quantities over a century ago and now found from the Berkeley Hills to San Diego, carries a vast water demand and will send roots a long way to meet it. California pepper, liquidambar, jacaranda, magnolia and willow all turn up regularly in our camera footage. In the Central Valley, almond and fruit tree roots reach laterals on rural-edge properties. In the Coachella Valley it is tamarisk, planted as windbreaks, and date palms.

The part that surprises people: you pay

Here is the fact that changes the economics. The City of Los Angeles does not maintain or reimburse private sewer laterals damaged by parkway trees. If a ficus the city planted in the strip of grass in front of your house has crushed or infiltrated your lateral, the repair is yours to pay for. That position has been tested and it has held. Burbank takes the same line, and its city council has examined the tree root and sewer lateral question directly without shifting the burden onto the city. Other California cities take similar positions, though details vary, so check with your own jurisdiction rather than assuming.

What this means practically is that there is no authority who will fix this for you, and gradual root intrusion is unlikely to be covered by insurance. The decision is entirely yours, and it comes down to arithmetic.

Cutting versus repairing: do the arithmetic

If you are paying for root cutting every eighteen months because a city tree keeps finding the same opened joint, add up five years of that cost and compare it with a single spot repair of that joint. In most cases the repair wins comfortably, and you stop having the problem rather than managing it indefinitely.

The question that decides it is how many entry points there are, and that is a camera question rather than a judgement call. If the footage shows roots entering at one joint, a short excavation and a replaced section ends the problem permanently, tree and all. If it shows them entering at six joints along the run, the pipe has reached the end of its service life and cutting is buying time at a recurring cost, in which case lining or replacing is the honest answer.

Chemical treatments and tree removal

Foaming root treatments have a legitimate place. They can slow regrowth inside the pipe and are worth using between cuts, particularly here where there is no dormant season working in your favour. What they will not do is clear an established mass, and they certainly do not repair the joint. Treat them as a way of stretching an interval, not a substitute for fixing the pipe.

As for removing the tree, almost never, and usually you should not want to. The intrusion happens because your pipe has an opening, not because a tree exists nearby. Repair the opening and the tree stops being a plumbing problem while remaining a mature shade tree worth having. Many LA street trees are city property in any case, so removal is not your decision to make.

If roots keep coming back in your line, the useful next step is finding out how many joints they are using. Call (866) 811-8305 and we will survey the run and tell you whether you are looking at a repair or an interval.