A Common Problem, Often Blamed on the Wrong Thing
Root intrusion into underground pipes is one of the most common calls plumbers get in established neighborhoods. It's also one of the most common reasons people call a tree service wanting a tree removed — believing the tree caused the problem and that removing it will fix it.
The reality is more complicated. Root intrusion typically involves both tree roots and pre-existing pipe vulnerability. Understanding which is which matters for figuring out what to actually do.
How Root Intrusion Happens
Tree roots don't seek out pipes and attack them. They grow opportunistically toward water and nutrients — which means they grow toward any available moisture source.
The typical sequence:
A pipe develops a leak or crack. This happens naturally with age — clay and cast iron pipes (common in older Tallahassee neighborhoods) degrade over decades. PVC pipes installed poorly or shifting in soil can develop gaps at joints.
Moisture and nutrients from the leak attract fine feeder roots. These small roots can enter through very small openings — hairline cracks, imperfect joints, degraded seals.
Roots inside the pipe grow. Once inside, roots continue growing, eventually filling the pipe and causing clogs or complete blockage.
The blockage is discovered and roots are blamed. The tree is often targeted, but the root cause (pun intended) was the pipe failure that created the entry point.
In intact, sound pipes, roots generally don't intrude. The root/pipe problem is usually a pipe maintenance problem and a root management problem together.
Which Trees Are Most Problematic
Trees with aggressive, moisture-seeking root systems that spread broadly pose higher risk to nearby pipes:
Water oak: Very common in Tallahassee, highly water-seeking root system, spreads extensively. One of the more problematic species near sewer lines.
Silver maple: Aggressive surface roots, common ornamental in residential yards. Its root system actively seeks water.
Willow species: Extremely aggressive water-seeking roots — willow near any water line is a known risk.
Sweetgum: Large, spreading root system, common in North Florida.
Poplars and cottonwoods: Less common in North Florida but notorious for root aggressiveness.
In contrast, deep-rooted trees with less aggressive surface root spread (live oak on well-drained sandy soil, most pines) are lower risk to lateral sewer lines at standard installation depths.
Proximity Matters More Than Species
The single biggest factor isn't species — it's how close the tree is to the pipe. A water oak 40 feet from your sewer lateral is a different risk profile than a water oak 8 feet from it.
Plumbing codes have setback recommendations for trees near water and sewer lines for this reason. When planting trees near your house, knowing where your lateral runs from the house to the street connection is useful information.
Diagnosing the Problem
If you're having recurring sewer clogs or getting reports of root intrusion, a sewer camera inspection gives you the actual picture:
- Where exactly in the line the intrusion is
- How severe the root mass is
- The condition of the pipe itself — cracks, collapse, joint failures
- Whether the intrusion is coming from one location or multiple points
This matters because the fix for a small root intrusion into a pipe that's otherwise sound is different from the fix for root intrusion into a collapsed or completely degraded pipe.
What Tree Removal Does and Doesn't Do
Removing the offending tree stops new root growth from that tree. The existing roots in the pipe — and the pipe damage itself — remain. A plumber still needs to clear the intrusion and address the pipe.
More importantly: if the underlying pipe is degraded and leaking, other roots from other trees (or the same species' neighbors) will eventually find the same entry points.
Tree removal makes sense when:
- The tree is close to the line
- The species has a particularly aggressive root system
- The tree itself has other problems (hazard, disease, excessive size for the location)
- Pipe repair is being done and the goal is to reduce future recurrence
Tree removal doesn't make sense as the primary fix when:
- The pipe itself is sound and the intrusion was through a single crack that gets repaired
- The tree is far enough away that roots reaching the pipe suggests an unusually aggressive incursion
- The pipe needs to be replaced anyway (in which case the tree's location becomes moot)
The Plumber + Arborist Approach
For a root intrusion situation, the most effective path involves both:
- Plumber: Camera inspection → root clearing → pipe repair or replacement as needed
- Arborist: Assessment of the tree, its species, proximity, root system, and overall condition → recommendation on whether removal makes sense given the pipe situation
We regularly work alongside plumbers on situations like this. An arborist assessment can help you make an informed decision about whether tree removal is warranted, rather than removing a significant tree as a reflexive first step only to find the pipe problem persists.
Questions about a tree near your pipes or utilities in Tallahassee? Call (850) 570-4074 or request an assessment online.