Chicago's older clay and cast-iron sewer lines are durable, but tree roots, ground shift, and decades of use take a toll. Here are the signs worth taking seriously.
The 7 warning signs
- Multiple drains slow or back up at once. One slow sink is a clog; several at once points to the main line.
- Gurgling toilets or drains. Air escaping a blocked line makes that telltale bubbling.
- Sewage smell inside or in the yard — a crack or break letting gas escape.
- Backups in tubs, showers, or basement floor drains, especially after heavy rain.
- Soggy, sunken, or unusually green patches in the yard along the sewer's path.
- Frequent clogs that keep coming back no matter how often you snake them.
- An older clay or cast-iron line — prime candidates for root intrusion and collapse.
Don't dig first — scope first
The single most important step is a camera inspection. A scope shows the exact problem and location, so you never pay for guesswork or unnecessary excavation. Any company that wants to dig before they've seen inside the pipe is guessing.
Your options once you know
- Rodding / hydro-jetting — clears clogs, grease, and roots when the pipe is still sound.
- Spot repair — fixes a single break without replacing the whole line.
- Trenchless replacement — lining or bursting that renews the line with little to no digging, sparing your lawn and driveway.
- Traditional excavation — when a line is fully collapsed or misaligned.
What it costs
- Camera inspection: $250–$500
- Hydro-jetting: $500–$1,200
- Trenchless replacement: $8,000–$25,000
The right fix is often far cheaper than the worst case — which is exactly why scoping early pays off.