The hardest leaks are the ones you can't see. Your main water line can be buried a foot or more down, under lawn, a walkway or a driveway, and a break there can run for weeks before anything shows on the surface. Underground water line repair is about finding that hidden break accurately, opening the ground only where it is, and fixing it without tearing up the whole yard.
Guessing is expensive. Digging in the wrong spot means extra holes, extra restoration and extra cost. That's why underground repairs start with locating, not shovels.
What's included
- Tracing the route of the buried line from the meter to the house.
- Pinpointing the leak using listening equipment and other non-invasive methods before any digging.
- Utility marking through 811 (DigAlert in Southern California) so gas, power and cable lines are identified first.
- Targeted excavation at the leak point, including saw-cutting concrete or lifting pavers if the line runs underneath.
- The repair itself, from a new coupling to a replaced length of pipe.
- Compacted backfill so the ground doesn't sink later, with surface patching discussed in your quote.
How a buried leak gets fixed
- Confirm there's a leak. With every tap and appliance off, the water meter is checked. If it keeps moving, water is escaping somewhere.
- Rule out the house. Toilets, irrigation and fixtures are checked so you don't dig for a leak that's actually indoors.
- Locate the line and the leak. Pressurized water escaping from a pipe makes a sound that can be picked up through the ground with specialist equipment. The spot where it's loudest narrows the dig area. You can read more about this on the leak detection page.
- Free quote. Once the location and depth are known, you get a price that reflects what's actually on top of the pipe.
- Dig, repair, test. The opening is made at the marked point, the damage is repaired, and the line is tested under pressure.
- Backfill and restore. Soil is replaced in layers and compacted, then the surface is put back as agreed.
Common causes of underground leaks
Shifting and settling soil. Ground that moves with heavy loads, compaction or nearby construction can stress a buried pipe until a joint opens or the pipe cracks.
Tree roots. Roots seek out moisture. A tiny weep from a joint attracts them, and as they grow they can squeeze or displace the pipe.
Corrosion from the outside. Metal pipe sitting in damp or aggressive soil can corrode from the outside in, eventually leaving a pinhole.
Weight on top of the line. Vehicles parking over a shallow line, or a driveway poured without enough cover, can crack pipe that was never meant to carry that load.
Watch for these surface clues: a strip of lawn that stays greener than the rest, a patch that's always soft or muddy, a small sinkhole or settling over the line's path, or a hissing or running-water sound near the meter when nothing is on.
When to call
Call if your meter moves with everything off, if your bill has climbed without a reason, or if any of the surface clues above appear. Don't wait for it to get worse: water running underground can wash soil away from under slabs, steps and driveways, turning a pipe repair into a concrete repair too. If the ground is visibly flooding, call right away, at any hour.
Underground repairs are available in Colton and nearby cities, including Bloomington, San Bernardino and Fontana. When a buried line has failed in several places, a trenchless water line replacement can replace it with far less digging than an open trench.
Think there's a leak underground?
Get it located before anyone starts digging. Free quotes, available 24/7.
Underground water line questions
How do I know the leak is underground and not inside the house?
Turn off every tap and water-using appliance and watch the meter. If it still moves, close your home's main shutoff valve. If the meter keeps moving with the house shut off, the leak is most likely on the buried line between the meter and the house.
Will my whole yard be dug up?
No. The point of locating the leak first is to dig only where it is. Most underground repairs need one opening at the leak point rather than a trench along the whole line.
What if the leak is under my driveway?
The concrete can be saw-cut to make a neat opening, the pipe repaired, and the area patched. In some cases rerouting the line around the driveway or replacing it by trenchless method is the better option. Your quote will cover the choices.
Can a small underground leak wait?
It's best not to wait. Even a slow leak wastes water you pay for, and the escaping water can soften and wash away the soil around the pipe and under nearby concrete, making the eventual repair bigger.