Short answer: a service line replacement follows the same order whether the pipe carries water or sewage. Confirm the existing pipe, get the utilities marked, secure the permits, choose the method, dig, install, connect, inspect before the trench is closed, then restore the ground. Most problems start when a step is skipped or done out of order.
1. Confirm the existing pipe and its route
Before anything is planned, we need to know what is in the ground: the pipe material, its approximate route, and where both ends are. For sewer that often means a camera inspection from the house. For water it can mean a leak locate. The material matters for the method, which is why the copper versus polyethylene question comes up early.
2. Get everything marked
Call 811 before any excavation and wait for the marks. Utilities paint and flag their lines, and the rules for hand digging near those marks apply. See how NJ mark-outs work.
3. Secure the permits and approvals
Municipal permits, road opening permits and any water utility approval for the connection need to be in place before the ground opens. The permits and inspections post covers who issues each one.
4. Choose the method
The main options are open trench, pipe bursting, and pulling the new line through an existing or bored path. The choice depends on the route, the ground, what sits on top of it, and what the pipe is made of. Pipe bursting, pulling in place, or open trench compares them.
5. Excavate and expose the line
Open the ground along the marked route and hand dig near marked utilities. Expose both ends so the connection points are known before the new pipe is cut in. Our post on the 24-inch rule near utility marks explains the hand-digging zone.
6. Install the new line
Lay the new pipe in its bedding at the depth and grade the job calls for. Sewer depends on slope, so grade is checked as the pipe goes in. Water lines are set at a depth that keeps them out of the frost, and the bedding protects the pipe from the rock and fill around it.
7. Connect at both ends
Make the connection at the house and at the main or the sewer connection point. A water connection at the main is often the purveyor's work or needs its approval, so confirm who makes that connection before the day arrives.
8. Inspect before backfill
The inspector sees the trench open, before it is covered. This is the last point where a problem can be found without digging the work back up. Ask in advance when the inspection will happen, so the trench stays open for it.
9. Backfill, compact and restore
Backfill in layers, compact it, and restore the surface: lawn, driveway, sidewalk or pavement, to the standard the permit sets. What the yard looks like afterward is covered in yard restoration after underground work.
Where lead or galvanized pipe changes the plan
If the existing service is lead or galvanized, the replacement may be tied to a town or water utility program, and that can change who pays and when the work happens. Our lead service line page covers that side of it.
The order is the same from job to job. The details of each phase, and the permits behind them, depend on the town and the route.
