Sewer Line Replacement

When a line has to be replaced

Lining and point repair rebuild a pipe that still holds its shape and its grade. Replacement is for the pipe that does not. Four conditions put a line in that category. A belly, a low section where the pipe has settled and holds standing water, which a liner copies exactly and which keeps collecting solids no matter what is cured inside it. Reverse grade, where settlement or a bad original installation has the pipe running uphill for a stretch. Collapse, where the camera stops at a wall of broken pipe and soil. And crushing or severe deformation, a lateral flattened under a driveway or an Orangeburg line gone so oval that a liner tube cannot pass. The camera inspection finds all four, and an installer who finds one and quotes a liner anyway is not doing you a favor.

Trenchless replacement: pipe bursting

Pipe bursting replaces the line along its existing route without a trench. A pit is opened at each end, a bursting head is pulled through the old pipe, fracturing it outward into the soil, and a new fused polyethylene pipe follows the head in. It handles collapse, crushing and deformation, it can upsize the line, and it leaves everything between the two pits untouched. What it cannot do is change the grade: the new pipe follows the old path, belly included. A belly can be addressed by bursting only when the installer can set the pull to pass above the low section and reconnect at corrected depth, which is sometimes possible on a short, shallow belly and more often is not. For most bellies and all reverse grades, the bad section comes out through an open cut.

Open-cut replacement

An open cut is the traditional method: a trench along the pipe's route, the old pipe removed, new pipe laid on compacted bedding at the correct grade, the trench backfilled and the surface restored. It is the only method that corrects grade, reroutes a line, or replaces pipe that is encased in concrete, tangled with other utilities or too shallow to burst. It is also the most expensive and disruptive, and the cost is rarely the pipe. It is the slab that has to be cut, the driveway or the patio over the line, the shoring on a deep lateral, the sidewalk restored to the city's standard, the traffic plan if the trench reaches the street, and the permits for every one of those surfaces. A well-scoped job uses an open cut only for the section that needs it, often a few feet at a belly, and lines or bursts the rest.

The combination most lines end up with

Real pipe rarely fails uniformly. A sixty-foot clay lateral with roots at every joint and one collapsed section under the sidewalk gets a small dig at the collapse and a full liner through the rest. A cast iron run under a slab that has rusted through in one spot and scaled everywhere else gets a short floor cut at the hole and a descaled, lined or coated line on either side. A main with a belly in one reach is dug there and lined from manhole to manhole elsewhere. The written scope should say which method applies to which feet of pipe and why, and the camera footage should be the reason.

Questions to ask before anyone digs

• Has the whole line been recorded on camera, and may I have the footage?
• Where exactly is the belly, collapse or crush, how long is it, and how deep?
• Can the rest of the line be lined or burst, so the dig is limited to the bad section?
• If a belly is the problem, is the fix a regrade of that section, or is the whole line being replaced?
• Whose pipe is it under the sidewalk and street, and who holds the permit for a pit there?
• What does the price include for restoring concrete, pavement, landscaping and the sidewalk?
• What is warrantied, by whom, and does it transfer to a buyer?

What drives the price

Replacement is priced by length, depth, the surfaces crossed, the permits required and the method: a burst costs more per foot than a liner and far less than an open cut on anything deep or paved; an open cut is priced largely by what it has to go through and put back. The honest comparison on most properties is not trenchless versus open-cut for the whole line but how few feet the open cut can be held to. A verified installer scopes it that way.

Whose pipe it is

In most of the country the owner is responsible for the lateral all the way to the public main, including the stretch under the sidewalk and street, and a replacement that reaches the main involves a street-opening permit, the utility's inspection of the connection, and sometimes the utility's own crew for the tap. A minority of cities take over at the property line or the curb. The state guides describe the common patterns, and the installer confirms the rule for the address before scoping.

Getting a straight answer

No installer listed on this site quotes a replacement, or a liner, without a camera through the line. Your state page says whether one is listed where you are; if none is, the national line locates a qualified contractor near you and makes the introduction at no charge.

Estimates are free. Call now. (855) 804-1434