San Jose, CA · Answering 24/7
Main water line leak repair in San Jose, found first and fixed at the spot
A wet patch in the front lawn that never dries, a meter spinning with every tap off, pressure that dropped at every fixture at once. The line between the meter and the house has sprung a leak, and we find it and repair it without replacing the whole run when a repair will do.
Main water line repair in San Jose fixes a leak on the service pipe between the water meter and the house. A meter that moves with every fixture off, a wet patch in the yard, or low pressure everywhere points to it. We locate the leak, excavate at that spot and replace the damaged length with new pipe and couplings.
Warning signs
Signs of a leak on the main water line
- A wet spot that never dries
Water surfacing along the line.
- Meter moving, taps off
Water leaving the system.
- Low pressure everywhere
A leak or a restricted line.
- Running-water sound
Heard at the meter box or house entry.
- Sinking soil or a cracked walk
Soil washed out by a leak.
- A sudden bill jump
A steady leak running all month.
- Muddy or rusty water
Soil or corrosion entering the line.
What happens after you call
How a main line repair runs
- 1
Meter test
Confirm the leak is outside.
- 2
Locate
Listen along the route.
- 3
Excavate
One hole at the leak.
- 4
Repair
New length spliced in.
- 5
Test
Pressure-tested before backfill.
- 6
Restore
Backfill and surface patched.
The job
Repair or replace the line
One leak on an otherwise sound line is a repair: dig at the leak, cut out the bad length, splice in new pipe. When the line is old galvanized rusted thin, has already leaked more than once, or is too small for the house, repairing it again only postpones the next leak, and replacement is the better value.
Hidden leaks inside the house are covered under leak detection.
Meter-to-house leak
The service line runs underground from the meter box to where the water enters the house, and a leak anywhere along it wastes water you pay for. Closing the house shutoff tells us which side of the wall the leak is on: if the meter keeps turning with the house valve closed, the leak is on the service line outside. We then locate it by listening along the route and at both ends, so we dig one hole at the leak rather than trenching the yard to find it.
Service line leak repair
Once the leak is found, we excavate to the pipe, cut out the damaged section and splice in new copper or polyethylene with couplings rated for the pipe on either side. On galvanized lines we look closely at the pipe at the cut, because a thin wall on both sides of the leak says the next one is close. The repair is pressure-tested with the hole still open, then backfilled and compacted. If the line needs replacing instead, that is covered under water main replacement.
Curb-stop and shutoff
The valve in the meter box belongs to the water supplier, and many older homes have no working shutoff of their own where the line enters the house. A leak on the service line is a good moment to fix that: we add or replace the main shutoff at the house, so the next emergency does not depend on finding a meter key. If the supplier's valve at the meter is itself leaking or will not close, that repair is the supplier's, and we tell you who to call.
Low pressure at every fixture
When every tap in the house loses pressure at the same time, the cause is upstream of the fixtures: a leak on the service line, a failing pressure regulator, a partly closed valve, or old galvanized pipe rusted down to a narrow channel. We read the pressure at a hose bib, check the regulator and valves, and run the meter test. Each cause has a different fix, and the gauge readings tell us which one you have before anything is dug up or replaced.
Local context
What sits between the meter and the house
San Jose service lines typically run from a meter box near the street to a shutoff where the line enters the house, and the stretch between them is the owner's to maintain. On older lots that pipe may be galvanized steel laid when the house was built, while remodeled homes often have copper or plastic spliced in along the way. The locate before any digging tells us what material we are looking for, which decides the fittings we bring to the repair.
Ready when you are
Yard wet and meter spinning?
Close the house shutoff and call. A dispatcher answers any hour.
Cost factors
What changes the price of a main line repair
Planning range, not a quote: $140 to $220 per hour for plumbers in Santa Clara County. Source: proplumbersanjose.com, 2026-07-26.
- Locating Finding the leak before digging.
- Depth and surface Deeper pipe or concrete above it adds work.
- Pipe material Galvanized, copper and plastic need different couplings.
- Time of call After-hours is billed differently; you hear how first.
- Shutoff at the house Added while the water is off.
Every job is priced after we see it; any published range is for planning only.
FAQ
Main water line questions
If the meter turns with the house shutoff closed, the leak is on the service line.
Usually the owner; the supplier handles the meter.
We dig one hole at the located leak.
Repair a single leak; replace a line that keeps leaking or is too small.
Not always; irrigation and drains can cause it, so we test first.
Yes, while the water is already off.
Yes. We answer 24/7 for active leaks.
Related work
Other Emergency & Leaks jobs we handle
Main line leak in San Jose? Call any hour
We find it before we dig.
Updated September 2026