Open-Trench Sewer Replacement: What Digging Involves

When digging is still the right call

Trenchless methods get a lot of attention, but open-trench replacement remains the most direct way to fix certain problems. When a line has collapsed, has a long belly that needs regrading, runs at the wrong slope or has to be rerouted, excavating and laying new pipe gives the contractor full control over position and grade.

It is also the method where you can see exactly what goes into the ground. New pipe, usually ABS or PVC, is laid on proper bedding at a consistent slope, connected at both ends and, where required, inspected while the trench is still open.

Stages of an open-trench replacement

Inspect, locate and plan.Camera footage and a locator establish the line's path and depth. The contractor plans the trench route and any access points.
Mark utilities and check permits.Underground utilities are marked before digging, and permit and inspection requirements are confirmed with the City of Fullerton.
Excavate.The trench is dug by hand or machine along the line. Deeper trenches may need shoring for safety.
Remove and lay.Old pipe is removed and new pipe is set on bedding at the correct slope, with proper fittings at transitions and connections.
Inspect and test.Where an inspection applies, it usually happens before backfill. The contractor may also test or scope the new line.
Backfill and restore.The trench is filled and compacted, and the surface is restored as agreed in the estimate.

What shapes an open-trench job

Depth: Deeper lines mean more excavation and possibly shoring
Length: The distance from the house to the connection point
Surface: Lawn, concrete, pavers or landscaping along the route
Obstacles: Trees, other utilities, walls and structures near the path
Restoration: What is rebuilt afterward and who does it

What the estimate should spell out

The trench route, approximate depth and length of pipe being replaced.
The pipe material and size being installed.
How the new pipe connects at the house and at the street end.
Who obtains any permit and schedules the inspection.
What surface restoration is included, such as concrete, pavers, sod or plants.
What happens if they find more damage or unexpected obstacles once they dig.

Questions to ask before digging starts

How long will the trench be open, and how long will drains be unusable?
Will any trees or roots near the trench be cut, and could that harm the tree?
How will the site be secured overnight?
Will I see the new pipe in the trench or on camera before it is covered?

Common questions

Is open-trench replacement outdated?

No. It is still the most direct fix for collapsed lines, bellies and lines that need rerouting. Trenchless methods suit some lines better, but not all.

Can the trench avoid my driveway?

Sometimes the route can be adjusted, and sometimes a combination of trenching and a trenchless section works. Ask the contractor what options exist for your layout.

Who fixes the lawn and concrete afterward?

It varies. Some estimates include full restoration and some only backfill. Get the scope of restoration in writing before work starts.

General information for Fullerton, not a quote or professional advice. In an emergency, call 911.