My neighbor's tree roots are in my sewer line. Who pays?
By Michael Schuck, ISA Certified Arborist WE-15750A · Last reviewed 2026-10-23
What is actually happening
Older Bay Area sewer laterals are clay or Orangeburg with joints every few feet. Joints shift, gaskets fail, and the pipe starts leaking water and nutrients into the soil. Roots from any tree within reach, often several trees, find the moisture and follow it into the pipe, where they grow into a mat that catches paper and causes the backup you noticed. The root did not break the pipe; the broken pipe recruited the root.
Two things follow. First, the roots in your lateral may come from your own tree, the street tree, or a neighbor's; the only way to know is to trace them, and plumbers rarely do. Second, cutting the roots is temporary. They regrow within a year or two unless the pipe is lined or replaced. That is why the real cost question is the pipe, not the roots.
What California law says
- Ownership. Civil Code 833: the tree belongs to the owner of the land the trunk stands on, wherever the roots go.
- Nuisance and negligence. Encroaching roots that cause actual damage can be a private nuisance (Civil Code 3479), and an owner who knows their tree is damaging a neighbor's property and does nothing can be negligent (Civil Code 1714). Courts have been reluctant to find either for sewer intrusion where the pipe was already defective, which is the usual case.
- Self-help. You may remove roots inside your pipe and cut encroaching roots on your side, within the Booska v. Patel limit of not injuring the tree.
- Lateral responsibility. Many Bay Area cities and EBMUD's service area place the whole lateral, including the segment under the street, on the property owner, and require inspection or certification at sale. That shapes who pays regardless of the tree.
What your city adds
Two things to check: whether the tree is a protected street tree or a protected private tree (removal is not on the table either way for a sewer problem), and whether your city has a private sewer lateral ordinance that defines your responsibility and may require a compliance certificate. Protected-tree rules by city →
What the report does for you
- Reviews the camera footage with you and identifies where the roots entered and whether a pipe defect preceded them.
- Identifies the roots to species and, where excavation on your side allows, to the specific tree, by following them from the pipe toward the trunk.
- States whether the tree is plausibly causing damage to a sound pipe, or whether a failed pipe is the cause and the roots are the symptom.
- Recommends a repair approach that will not recur: lining, replacement with gasketed pipe, a root barrier where it will actually work, and which roots can be cut safely.
- Cites the Civil Code sections and your city's lateral and tree rules.
Dispute Assessment Report, from $850. A desk review of the camera footage and plumber's report alone is $250 and often enough to tell you whether a claim exists. Pricing →
What to do this week
- Get the camera footage, not just the plumber's summary. Ask for the recording and the footage counter where the roots appear.
- Do not send a demand yet. If the pipe failed first, the demand goes nowhere and the neighbor relationship is spent.
- Text the footage and a photo of the tree to (415) 881-0124 for a free read on whether a desk review or a site visit makes sense. Intake →
Sources
- Civil Code § 833, § 1714, § 3479.
- Booska v. Patel (1994) 24 Cal.App.4th 1786.
Questions people ask
The plumber said it's the neighbor's tree. Isn't that enough?
A plumber can tell you there are roots in the pipe. Identifying which tree they came from, and whether the pipe failed first, is a different question. Roots enter laterals through joints and cracks that were already open; a camera shows roots, not cause. The arborist report and the camera footage together make the case, or show there isn't one.
Can I make the neighbor pay for the repair?
Only if you can show their tree's roots caused actual damage to a sound pipe, or that they knew of a problem and ignored it. Most sewer-root cases end with each owner paying for their own side of the lateral, which is why documenting the facts before paying matters.
Can I cut the roots?
Roots inside your pipe on your land, yes, by cutting or hydro-jetting. Cutting large roots in the ground near the trunk is governed by Booska v. Patel and can make you liable for the tree.
Is the sewer lateral mine or the city's?
In most Bay Area cities the lower lateral from the property line to the main is the property owner's responsibility too, and some cities require a lateral inspection at sale. Check your city's sewer lateral ordinance; several (Berkeley, Oakland, Albany, EBMUD service area) have one.
Will the report fix the pipe?
No. It establishes cause and responsibility so the repair cost lands in the right place and so a replacement pipe is routed or lined to avoid a repeat. A plumber lines or replaces the pipe.
When you need a lawyer instead of (or as well as) an arborist
Call a California attorney first if a lawsuit has already been filed, if the damage is over the small claims limit and the other side will not negotiate, or if the dispute is really about where the property line is. We work alongside attorneys every week and the report is written to be used in that setting, but we do not give legal advice and we do not opine on property lines. How we work with attorneys →