Short answer
Tree roots in a sewer line usually enter through cracks or loose joints, because they follow moisture leaking from the pipe. Gurgling drains, slow drains and repeat backups are the common warning signs. A camera inspection confirms roots and shows the pipe condition. Cutting or jetting roots clears the line for now, while repair, lining or replacement deals with the opening.
If you suspect tree roots in your sewer line, you are probably dealing with slow drains, gurgling or a backup that keeps coming back. This guide explains how roots get in, how to tell whether roots are the cause, what the main fixes are in general terms and how to lower the chance of a repeat. It is written for homeowners in the US, with a note for Canadian readers.
One limit up front. This page gives no prices, because costs depend on your area, the depth of the pipe and what the camera finds. For cost drivers on cleaning work, see our guide to drain cleaning cost.
How do tree roots get into sewer lines
Roots usually need an opening that already exists, such as a crack or a loose joint. The City of Traverse City, Michigan explains on its tree root FAQ that warm water flowing through a sewer pipe releases water vapor into the cold soil around it. Roots follow that moisture trail to cracks or loose joints, then grow inside. The same page says this can continue in winter, even when trees look dormant.
Once a root has a foothold, it thickens inside the pipe. The page notes that root masses also collect grease and debris, which narrows the pipe further. Continued growth can crack or collapse the pipe, and that can mean replacement.
Why some pipes are more at risk
- Pipe material. Traverse City says clay tile pipe, common before the late 1980s, is especially vulnerable. It says concrete and PVC resist intrusion better, and that PVC's tight joints help most.
- Joints and defects. Any structural fault, such as a crack or a loose joint, gives roots a way in. Pipes with more joints have more places to fail.
- Trees nearby. The same page says roots can spread up to 2.5 times the height of the tree, and some species reach five to seven times. A tree can reach a pipe from farther away than most people expect.
Signs of tree roots in a sewer line
Roots rarely announce themselves on day one. The early signs look like an ordinary clog, which is why a camera is the only way to be sure. Traverse City lists gurgling toilets and wet areas near floor drains after laundry as signs of slow drainage. The City of Sioux Falls lists water not draining from below-ground floor drains, water rising through floor drains, showers or toilets, and slow draining below ground level as signs of a sewer blockage.
| What you notice | What it may point to | Sensible next step |
|---|---|---|
| One sink or tub drains slowly | Usually a local clog in that fixture's own drain | See clogged drain: what to try yourself and when to call a plumber |
| Several drains slow at once, or gurgling when water runs elsewhere | A partial blockage in the main line, which can be roots, buildup or damage | Book a plumber and ask for a camera look |
| A basement floor drain is wet or rises after laundry | A restriction in the line leaving the house | Stop using water, then call a plumber or your utility |
| The same backup returns after being cleared | Something is re-forming the blockage, possibly roots entering a defect | Ask for a camera inspection and the video |
| Wastewater in the yard or a wet, smelly patch over the line | A serious break or blockage | Call a licensed plumber and ask your health department about safety |
None of these signs proves roots. Grease, wipes, a sagging section of pipe and other causes look the same from inside the house. For the main line itself and where it runs, see main sewer line location: how to find it.
How a camera inspection confirms roots
A sewer camera is a small waterproof camera on a flexible cable that a plumber feeds into the line, usually through a cleanout. It lets you and the plumber see inside the pipe instead of guessing. Traverse City suggests having a sewer cleaning company video-inspect the line. The City of Fairfield, Ohio encourages a closed-circuit camera inspection of the lateral after a blockage is cleared, to find the cause and plan future maintenance.
What to ask for:
- The video itself, or a copy of it, so you can show it to a second company or your utility.
- Where roots are, how many entry points there are and roughly how far from the house.
- The pipe material and any cracks, offsets, low spots or collapsed sections.
- Whether the plumber thinks cleaning will be enough or the pipe needs repair.
A camera inspection may cost extra, and some companies credit it toward the work. Ask before the visit.
Sewer line root removal and repair options
There are two jobs here: clearing roots that are in the pipe, and dealing with the opening that let them in. Cleaning alone does the first job. Roots can return if the defect remains, so it helps to know which job you are paying for.
| Option | What it does | What to know |
|---|---|---|
| Cutting roots | A cutting tool on a cable clears roots from the pipe | Traverse City names augers, root saws and high-pressure flushers as common tools. The opening remains, so roots can grow back. |
| Hydro jetting | High-pressure water flushes roots and buildup | Needs sound pipe. See hydro jetting explained and hydro jetting cost. |
| Spot repair | A damaged section is repaired or replaced | Suits a defect in one place. Needs access to that section, often by digging. |
| Lining | A resin-soaked liner is placed inside the old pipe and hardens, forming a pipe within a pipe | The City of Columbus, Ohio describes this method but says it is not always an option, citing the sewer's size and condition. Ask whether your pipe qualifies. |
| Replacement | The old line is replaced with new pipe | Often considered when the camera shows collapse, severe cracking or widespread joint failure. |
A reasonable plumber will explain which row fits what the camera showed, not recommend replacement or lining before looking. If you are quoted a major repair, get a second opinion and ask each company for the same video and a written scope. For help comparing quotes, see our method in drain cleaning near me: how to find and vet a company.
Preventing roots and what to plant where
You cannot make a pipe root-proof, but you can reduce the odds and catch problems early.
- Know where the line runs before planting. Traverse City advises homeowners to know where their sewer service runs and advises against planting certain trees and hedges near sewer lines. That page does not name species.
- Ask a local arborist or your utility which trees and shrubs suit your soil and how far from the line to plant them. Roots, soil and climate differ by region, so general lists can mislead.
- Remember how far roots travel. A mature tree standing well away from the pipe can still be the source, so include large trees in the yard and along the street when you look for the cause.
- Keep the pipe sound. Traverse City recommends regular cleaning of the sewer lateral and keeping it structurally sound, since any fault can admit roots.
- Schedule a camera check if you have an older clay pipe, a big tree near the line or a history of backups.
- Call 811 before you dig to plant, even a shrub. See the next guide, main sewer line location, for how that works.
Who is responsible for which part
Responsibility depends on where you live, so check before you pay for work. The cities we looked at draw the line in different places.
- The City of Fairfield, Ohio says the city is responsible for the public sewer main and the homeowner is responsible for the lateral, the line from the house to the main.
- The City of Sioux Falls, South Dakota says the city handles the sewer main and the homeowner is responsible for the private sewer line.
- The City of Olympia, Washington says the owner owns the cleanout, and the city owns the pipe from the main to a cleanout at the right-of-way line when one exists. It says the city does not remove roots or blockages from side sewers, though it may remove roots from its own sewer when they come from trees in the right-of-way.
Those are examples, not rules for your address. Ask your city, sewer district or utility where the public pipe ends and yours begins, and whether roots from a street tree change anything. Then ask your insurance company whether your policy covers sewer backup or line damage. Policies differ a lot, so read yours or ask the insurer before work starts.
What to look up where you live
- Your sewer utility, sewer district or city public works: where the public pipe ends and yours begins, and how to report a backup.
- State or provincial plumbing or contractor licensing board: to confirm a plumber's license and check complaints.
- County health department or environmental health office: for sewage in the house or yard.
- A local certified arborist or your county extension office: for trees that suit your soil and where to plant them.
For Canadian readers. Plumbing is regulated by each province or territory, and municipalities set their own rules for sewer connections and tree planting. Check your provincial regulator and your city. Costs are in Canadian dollars and cannot be compared directly with US figures.
When to call a plumber
- Several fixtures slow or backing up at once, or a basement drain overflowing.
- Sewage coming up through floor drains, tubs or toilets. Stop using water. The City of Sioux Falls notes that raw sewage carries bacteria, viruses and fungi, so avoid contact and ask your local health department about cleanup.
- The same backup returns after a cleaning.
- You are buying an older home with large trees near the line. A camera inspection before closing can show the pipe's condition.
Call the plumber first, then your insurer. Keep notes and photos, and keep the camera video.
For plumbing, drain and septic company owners
Tree roots in a sewer line and sewer line root removal are searches your customers make before they pick up the phone. If you want to be the company they find, read drain cleaning marketing and how to price drain cleaning and hydro jetting. You can also book a call with LiveLeadsLane. LiveLeadsLane is a marketing practice for contractors, not a directory, and it does not take jobs or refer homeowners.
