Tree Roots and Sewer Lines: Why Spring Can Bring Drain Problems
Spring rain and renewed plant growth can make underground sewer-line problems more noticeable. If a sewer pipe already has a crack, loose joint or other opening, nearby roots may enter the line and grow toward the moisture and nutrients inside.
Root intrusion usually develops gradually. Homeowners may first notice a recurring clog or slow drain before experiencing a complete sewer backup.
Why Do Tree Roots Enter Sewer Lines?
Roots generally cannot penetrate a sound, properly sealed sewer pipe. Instead, they take advantage of existing openings created by:
Cracked pipe walls
Separated or loose joints
Deteriorated pipe materials
Failed seals
Misaligned sections
Collapsed or sagging piping
Fine roots can enter through a small defect and continue growing inside the pipe. They then catch toilet paper, grease and other waste, gradually restricting wastewater flow.
A U.S. Forest Service study of roots and sewer infrastructure discusses how tree roots enter damaged sewer systems and contribute to blockages and maintenance problems.
Why Can Root Problems Become More Noticeable in Spring?
Trees and other plants enter an active growth period as temperatures rise. Spring rain also increases soil moisture and may reveal leaks or drainage problems that were less noticeable during drier conditions.
Heavy rain can further stress a damaged sewer system if groundwater enters through cracks or loose connections. When a pipe is already restricted by roots and debris, the additional water can make gurgling, slow drainage and backups more apparent.
Root intrusion is not limited to spring, however. Once roots are established inside a sewer line, they may continue creating problems throughout the year.
Warning Signs of Root Intrusion
Possible signs include:
Several drains slowing at the same time
Toilets gurgling when other fixtures drain
Recurring clogs after previous cleaning
Wastewater appearing in a bathtub or floor drain
Sewage odors inside or outside the home
Wet or unusually green areas over the sewer route
Drain problems that worsen during heavy rain
One slow sink is more likely to have a localized clog near that fixture. Multiple affected fixtures may indicate a blockage farther down the drainage system or in the main sewer line.
Why Are Sewer Backups Dangerous?
A sewer backup can expose occupants and building materials to wastewater containing bacteria, viruses and other contaminants. It can also damage flooring, walls, cabinetry and personal belongings.
The EPA explains that sanitary sewer overflows may discharge untreated sewage into homes, streets and the environment, creating public health and water-quality risks.
If sewage is entering your home:
Stop using water and plumbing fixtures
Keep children and pets away
Avoid direct contact with contaminated water
Do not use electrical devices near standing water
Contact a plumber promptly
Arrange professional cleanup when needed
How Are Tree Roots Found in a Sewer Line?
Because the sewer lateral is buried, symptoms alone cannot confirm root intrusion. A professional may begin by clearing enough of the obstruction to restore access and then use a sewer camera to inspect the pipe.
A camera inspection can help identify:
The location of root entry
Cracks or separated joints
Sagging pipe sections
Collapsed piping
Corrosion or deterioration
Objects or accumulated debris
The general condition of the sewer line
A camera does not solve the blockage, but it provides information needed to choose an appropriate repair.
How Are Roots Removed From Sewer Pipes?
The solution depends on the severity of the blockage and condition of the pipe.
Professional mechanical cleaning
Specialized cutting equipment may remove root masses and restore flow. This can be effective when the pipe remains structurally usable.
High-pressure water cleaning
Hydro jetting may remove roots, grease and accumulated debris in some sewer lines. It should only be used after evaluating the pipe because severely damaged or fragile piping may not be suitable.
Sectional pipe repair
A damaged portion of the line may need to be excavated and replaced when roots have entered through a localized crack, failed joint or collapse.
Trenchless repair
Some properties may qualify for pipe lining or pipe bursting, depending on the existing material, amount of damage, access and local requirements.
Removing roots restores flow, but it does not necessarily close the defect through which they entered. If the opening remains, roots may return.
Can Chemical Root Treatments Fix the Problem?
Root-control products may slow regrowth in some situations, but they do not repair a cracked, separated or collapsed sewer pipe. They also may not remove a large obstruction that is already trapping waste.
Do not pour random chemicals or herbicides into a drain. Product use may be restricted by the plumbing material, sewer provider or local regulations. A professional inspection can determine whether treatment is appropriate as part of a larger maintenance plan.
Can Root Intrusion Be Prevented?
Homeowners can reduce the risk by:
Addressing recurring clogs early
Having unexplained sewer problems professionally inspected
Locating sewer lines before planting trees
Choosing planting locations based on mature root spread
Repairing known pipe defects
Keeping grease, wipes and other clog-forming materials out of drains
Maintaining records of prior cleaning and repairs
There is no universal inspection schedule for every home. Properties with older sewer materials, mature trees or a history of root intrusion may benefit from periodic camera inspections based on a plumber’s findings and recommendations.
When Should You Schedule Drain or Sewer Service?
Schedule professional service if multiple drains are slow, clogs repeatedly return or fixtures begin reacting to one another. For example, a toilet that gurgles when the washing machine drains may indicate a shared-line or main-sewer problem.
RCI Mechanicals provides drain cleaning and plumbing services in Murfreesboro and Middle Tennessee for residential and commercial properties.
If you suspect roots or another obstruction inside your sewer line, contact RCI Mechanicals before a slow drain becomes a wastewater backup.