Two ways to get a new pipe in the ground
Open-trench replacement digs a continuous trench along the route, lays new pipe, and backfills. It is straightforward, lets the installer see the whole run, and works on almost any lot, but it opens every surface the line crosses.
Trenchless replacement uses small access pits at each end. The new line is either pulled through the path of the old one, sometimes splitting the old pipe as it goes, or pushed along a new route with a boring tool. Lawns, walkways and driveway sections between the pits are usually left undisturbed. Whether it fits your property depends on soil, obstacles, the old pipe and the route.
Side by side
Open trench
- Continuous dig along the full route
- Every crossing of lawn, walk or driveway must be restored
- Installer can inspect and bed the whole pipe
- Works with most materials and soil types
Trenchless
- Small pits at the meter side and the house
- Less surface damage between the pits
- Usually uses flexible pipe such as polyethylene
- Needs a route free of obstacles the tool cannot pass
Which method suits which lot
| Situation | Leans toward | Why |
|---|---|---|
| Short, straight run under lawn | Either | Both are practical; restoration is simple |
| Line runs under a driveway or patio | Trenchless | Avoids cutting and replacing concrete |
| Mature tree near the route | Trenchless or reroute | Limits damage to the root zone |
| Many unknown utilities crossing the route | Open trench | Crossings can be seen and protected |
| Very rocky or debris-filled soil | Open trench | Boring tools may not pass easily |
| Old line in a poor location, such as under the slab | New route, either method | Abandon the old path entirely |
How a trenchless replacement typically runs
- Mark utilities.Underground utilities are marked through 811 before any digging.
- Dig access pits.One near the meter connection, one where the line meets the house.
- Pull or bore.The new line is pulled through the old path or bored along a new one.
- Connect both ends.The new pipe is joined at the meter side and to the house, often with a new shutoff.
- Test and close.The line is pressure tested, any inspection is completed, and the pits are backfilled.
Questions before choosing a method
- Is my route suitable for trenchless work, and what could stop it?
- Which pipe material does each method use?
- Exactly which surfaces will be disturbed and restored?
- What happens if the tool hits an obstacle partway?
- Is restoration of lawn, concrete or pavers included in the price?
Common questions
Is trenchless always less disruptive?
Usually on the surface, yes. But it still needs access pits, and if the route is unsuitable an open trench may be the more reliable choice.
Can every contractor do trenchless water lines?
No. It takes specific equipment and experience. Ask how often they do it and confirm their CSLB license at cslb.ca.gov.
Does the method affect permits?
The permit is typically tied to the replacement itself, not the method. Check with the City of Fullerton about what your job needs.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.