Tree Root Removal from Sewer Lines in Chicago, IL

How Roots Actually Get Into a Sewer Line

Clay and cast-iron laterals are made of short sections joined together, and those joints are the weak point. Tree roots are drawn to the moisture and nutrients seeping from the pipe and find their way in through a joint that's shifted or a hairline gap, then spread and thicken inside the pipe once they're in - eventually forming a mass that catches paper and waste and blocks the line.

Why the Same Line Clogs Again After It's Cleared

Rodding or cutting removes the root mass that's blocking flow, but it doesn't remove the roots still present at and around the joint. Left alone, they regrow into the same space, often within a season or two - which is why some lines in older, tree-lined parts of Chicagoland seem to need clearing on a predictable cycle.

Root Cutting, Jetting, or Lining: What Each Achieves

A root-cutting head on a cable shears roots out of the pipe more thoroughly than a standard rodding cable. Jetting can clear smaller root growth along with general buildup. Neither seals the joint the roots are entering through - for a line with a persistent root problem, trenchless lining creates a new interior pipe surface that roots can't penetrate the same way, addressing the cause rather than the recurring symptom.

What Drives the Cost Up or Down

How established the root mass is, how many joints are affected along the line's length, and whether a camera inspection has already mapped where the problem sections are all affect the job. A single joint caught early is a simpler job than a line with root intrusion at multiple points.

Deciding Between Clearing It Again and Fixing It

If a line clogs from roots once every few years, repeat clearing is often the practical choice. If it's clogging annually or more, or backing up multiple fixtures each time, the cost of repeated emergency calls starts to outweigh the cost of a camera inspection and a real fix. There's no universal answer - it comes down to how often it's happening and what the camera shows.

Trees That Cause the Most Trouble

Any tree can send roots into a sewer line, but some species are more aggressive than others. Silver maples, willows, cottonwoods, poplars, and elms are known for fast-growing, water-seeking roots. Many Chicago-area parkways were planted with these species decades ago, and their roots often reach laterals running under the parkway and front yard.

Shrubs and smaller trees can cause problems too, especially when they are planted directly over a sewer line. Knowing where your lateral runs helps when choosing what to plant and where.

The Removal Process

The technician rods the line with a cutting head designed for roots, often starting with a smaller head to open the line and then following with a larger blade sized close to the pipe diameter. Multiple passes may be needed for heavy root masses. After cutting, the line is flushed and, when appropriate, inspected with a camera to confirm the roots have been cleared and to see where they are entering.

Chemical Root Treatments

Some contractors offer foaming root control products that are applied after mechanical cutting. These treatments are designed to kill roots inside the pipe and slow regrowth. They can extend the time between cleanings but are not a substitute for mechanical removal or repair. Local regulations on chemical use in sewers vary.

Long-Term Options

Routine rodding every one to two years keeps root growth in check for many homes. When roots are entering through a single joint, a spot repair or sectional liner can seal that joint. When roots are entering along much of the line, full lining or replacement provides the most lasting solution.

Removing the tree is sometimes suggested, but it is not always practical or necessary, and trees on the parkway are usually owned by the municipality.

How Roots Get Into Sewer Lines

Roots do not break into sound pipe. They find their way in through existing gaps: joints in clay tile where the original seal has deteriorated, hairline cracks, and connections where two different pipe materials meet. Warm, moist air and a trickle of water escaping from those openings attract fine feeder roots, which slip inside and begin to grow. Inside the pipe, they have everything they need, water, nutrients, and oxygen, and they can fill a section of line surprisingly quickly.

As roots grow, they catch toilet paper and waste, which builds into a dense plug. They also expand the gaps they came through, loosening joints and eventually cracking or displacing sections of pipe. That is why a root problem that starts as an occasional slow drain can, over years, become a structural failure.

Signs of Root Intrusion

The earliest sign is often a basement floor drain that drains slowly or gurgles, especially after heavy water use. Toilets may need more than one flush, and the problem often gets worse in spring and summer when trees are actively growing. Eventually, the line may back up entirely. When the line is rodded, the cable brings back root material, anything from fine hair-like strands to thick, fibrous clumps.

In the yard, an unusually lush strip of grass along the route of the lateral can sometimes indicate a leak that is feeding roots. A camera inspection confirms whether roots are present and shows where they are entering.

Parkway Trees and Responsibility

In Chicago and many suburbs, the tree on the parkway between the sidewalk and the street belongs to the municipality, while the lateral beneath it belongs to the property owner. That means roots from a city tree can enter your lateral, and the cost of clearing and repairing it is usually still yours. Some municipalities have policies on tree removal or root pruning near sewers, but they vary widely.

If roots are coming from a parkway tree, it is worth contacting your municipality’s forestry department to ask about their policies. In many cases, the practical answer is still routine rodding or repairing the lateral so roots cannot enter.

Setting a Maintenance Interval

Once roots have entered a line, they will grow back after cutting. How fast depends on the tree species, the size of the entry points, and the season. For many homes with clay laterals and mature trees, rodding every twelve to twenty-four months keeps roots from building into a full blockage. Some lines need more frequent service, and some can go longer.

The best way to set the interval is to track when problems occur and what the cable brings back. If the line starts slowing down eleven months after each cleaning, scheduling rodding at ten months keeps you ahead of it.

Frequently Asked Questions