Buyers GuideUpdated June 20, 2026
Older homes in Cortland may still rely on clay-tile sewer lines that were commonly installed decades ago, especially before PVC became the standard. These pipes are known for their susceptibility to cracking, shifting, and infiltration from tree roots. With the region's freeze-thaw cycles and heavy clay soils, aging sewer lines can start showing serious problems before homeowners even realize there's an issue.
Why Older Alsip Homes Have Clay Sewer Lines
A lot of houses across northern Illinois, including Cortland, were originally built with clay-tile sewer pipes. Builders used clay tile because it was widely available, resistant to most chemicals, and seemed like a durable choice at the time. The trouble is, clay pipe is brittle. It doesn't flex or bounce back when the ground moves. Over the years, our team has seen how local soil, especially the dense, moisture-holding clay found under much of DeKalb County, can press and shift around buried pipes. When ground movement combines with root pressure from trees and freeze-thaw cycles, clay pipes start to give out.
Common Ways Clay Pipes Fail
With clay tile, there's no way to bend or reinforce a run once it's in the ground. These lines come in short sections joined by loose-fitting sleeves. Over decades, the joints can separate. Water seeps out and soil washes in. Tree roots sniff out any hint of moisture and make their way into the line, creating thick webs that block the pipe and break up the clay. Cracks and holes form, letting in even more roots, dirt, and debris.
Winter is hard on buried pipes. As the frost level drops, the soil contracts and expands. If you have a freeze-thaw cycle like we do in Cortland, little cracks can grow bigger each year. Sometimes, a heavy vehicle or new landscaping can finish the job, collapsing a fragile pipe completely.
Warning Signs Your Clay Sewer Line Is Failing
You won't always see a fully blocked sewer right away. Often, clay pipe problems show up in more subtle ways first. Watch for these common symptoms:
- Sewer odors coming from basement floor drains or outside the house
- Repeated drain backups or slow draining in multiple fixtures
- Unusually lush or sunken patches in the yard above the sewer route
- Standing water or seepage around the foundation during wet weather
- Gurgling sounds from toilets or main drains
The sooner you catch and address these problems, the less likely you'll face a full collapse or a messy backup. We handle thorough drain cleaning and have the right equipment to inspect pipe interiors and locate the trouble spots.
How We Diagnose and Fix Clay Sewer Pipe Issues
Our team uses modern sewer cameras to inspect the entire line from inside. We look for root balls, cracks, collapsed sections, and areas where the pipe has shifted or started to break apart. Once we know what's going on, we'll walk you through repair or replacement options that fit your home and budget.
Spot repairs are possible in some cases, but with clay tile, problems often show up along the whole length. Full replacement with PVC or HDPE pipe is the most reliable solution. These materials are watertight, resist roots, and won't break down from ground pressure or freeze-thaw stress. When we replace a line, we make sure to handle any necessary foundation sealing or sump pit work. If you have basement seepage or a high water table, our sump pump services help keep water away from your foundation and sewer tie-ins.
We also offer leak location and repairs for pipes under slabs and driveways. You can learn more about how we find hidden problems on our leak detection & repair page.
How Local Clay Soils Make Sewer Problems Worse
Cortland sits on heavy clay soils with a moderate water table. This soil doesn't drain as well as sand or loam, so it holds moisture and swells when wet. The pressure from swelling and shrinking around sewer lines can force clay pipes to crack or shift, especially after wet seasons or during freeze-thaw periods. That means even if your sewer line was installed by the book, local soil will still put it to the test.
This is also why you might notice yard sinkholes or patches of ground that stay wet long after rain. If these are near your sewer route, it could mean the line is leaking. In homes that already have water issues in the basement, our team often recommends both pipe repairs and checking that your waterproofing and pipe repair & repiping systems are up to date.
Your Options for Sewer Replacement
If your clay-tile sewer line is in bad shape, a full replacement gives you a reliable fix. We'll talk through trenchless options or open trench depending on your property, line depth, and any other buried utilities. Trenchless pipe bursting or lining works well in some cases and keeps yard damage minimal. For lines with multiple breaks or severe offset joints, digging may be needed to do the job right.
Once replaced with high-quality plastic piping, you can expect your new sewer line to last for decades. It's wise to maintain your drains and schedule periodic inspections, especially after big storms. For details on how we handle full sewer system work, see our sewer line services page.
If you're seeing signs of sewer trouble or want an inspection before buying a home, our team is ready to help. Call us at 779-217-8620 for straight answers and reliable service for your Cortland property. We know the local soil, codes, and plumbing systems inside and out.