Pipe bursting in Chicago, IL

Pipe bursting is the trenchless method for a sewer line that is past saving. Instead of curing a liner inside the old pipe, it destroys the old pipe and puts a new one where it was. A steel cable is run through the line, a splitting head is pulled back along it under hydraulic force, and the fragments of the old clay, cast iron or Orangeburg are pushed out into the surrounding soil while the replacement follows in behind.

The pipe going in is normally HDPE, heat-fused into a single continuous length before it leaves the surface. That matters more in this city than the method does. A fused line has no joints along its length, and joints are where a Chicago lateral fails.

Clay and Orangeburg, which is why this page exists separately

The two failures that most often rule out lining are the two that most often turn up here.

Vitrified clay was standard on Chicago laterals for the first half of the twentieth century. It is laid in short sections, and the mortared joints between them take root intrusion and settlement until the line is a series of steps. Where the offsets are bad enough, there is no round host pipe for a liner to be cured against.

Orangeburg is the post-war one. It is a rolled fiber pipe bound with hot pitch, cheap and quick to lay when the housing went up, and its failure mode is not a crack. It goes oval under the weight of the ground, slowly, until the top of the pipe meets the bottom. A liner needs a shape to take, and an Orangeburg line that has gone flat has not got one left to give it.

What the job costs you above ground

Two pits, not a trench. One at the building end, usually close to the foundation wall or an existing cleanout, and one at the far end near the parkway or the sidewalk. Everything between them stays undisturbed, which on a standard Chicago lot is most of the front garden and all of the walk.

That is the honest version of the trenchless claim. Nobody opens the whole run, but two holes still come out of the ground, and the saving only means something when the ground in between is expensive to put back. Under a finished basement slab, or beneath mature parkway trees, it usually is. Across an open lawn it is a closer call, and that is a conversation to have before the work is booked rather than after.

The Illinois rule most Chicago sewer pages never mention

Bursting displaces soil sideways along the whole run, so what else is buried next to the line stops being a detail. Illinois handles that through JULIE, the state's one-call service. The Underground Utility Facilities Damage Prevention Act requires the locate before the excavation, the Illinois Commerce Commission enforces it, and the penalties run to $5,000 per violation.

There is a second rule, newer, and it applies directly to what bursting does.

Illinois now requires that any service lateral which is completely replaced, or newly installed, be made locatable by electromagnetic or other equally effective means. Pipe bursting is a complete replacement. The new line should therefore go in with a tracer wire, marker tape or an equivalent along it.

A tracer wire is a requirement on the job rather than an upsell, and it is worth asking about by name, because the reason the rule exists is the situation you are already in. JULIE's own explanation says clay and Orangeburg laterals cannot be found with electromagnetic locating equipment at all. The pipe being replaced today is invisible to a locator, which is exactly why the one replacing it must not be.

Whether the line under your lot is a bursting job, a lining job or a repair of one section is decided by video, not by a method somebody prefers to sell. The full set of options is on the page about trenchless sewer repair in Chicago, and the cases where no trenchless method is the right one are set out in what trenchless repair cannot fix.