Can you do a water line replacement without digging up the whole yard?

Usually, yes. A trenchless pull needs a pit at each end of the run and leaves everything between them alone. Open trench is the better call when the old line changes direction underground, runs too shallow, or has collapsed too badly to pull through. We'll say which fits once we've located the pipe.

Should I replace a line that has only leaked once?

Not necessarily. One leak in a line that's otherwise sound and holds pressure once patched is a fair case for main water line repair , and we'll tell you so. Replacement earns its keep when the pipe is galvanized steel, when this is the second leak, or when the rest of the run is as corroded as the failed spot.

What if the leak is on the street side of the meter?

Then it's the City's pipe, and water main repair in the street is their work, not yours. Call the City's water utility. If you're unsure which side it's on, your local Mr. Rooter team in Sunnyvale and Mountain View can confirm it at the meter before you call.

Does a main water line replacement in Mountain View need a permit?

Yes. The City issues a Water Service Line Replacement Permit for the run between the house and the City meter, with a rough inspection before the pipe is covered and a final inspection when the work is finished. We handle the permit and both inspections as part of the job.

Is the leak in the main water line or inside the house?

Close the main shutoff at the house with every fixture off. If the meter dial still turns, water is escaping between the meter and the house, so the service line is leaking. If it stops, the leak is indoors. If it's unclear, leak detection settles it before anyone digs.

Main Water Line Replacement in Mountain View, CA

Replace It Once, Not Repair It Twice

The pipe from the meter to your house is the one line you never see, and the City doesn't own it. Nearly half of Mountain View's housing units were built between 1950 and 1979, by Census Bureau ACS figures, so many service lines are on their second or third leak. Mr. Rooter Plumbing® of Sunnyvale - Mountain View handles the full water line replacement, priced upfront.

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When Replacing the Main Water Line Beats Another Repair

A single pinhole in an otherwise sound service line is a fair case for a spot repair, and that's a different job we handle as water line repair. The second leak changes the question. A buried line fails for reasons that apply along its whole length: the same pipe material, the same soil, the same decades of pressure, the same ground movement. Patch the spot that gave way and you've fixed one foot of a line that has the same thing coming elsewhere. Each repair means another hole in the yard, another day without water, and another bill, and the next one tends to arrive sooner than the last. Public mains in the street wear out the same way. The ASCE 2025 Infrastructure Report Card counts roughly 240,000 water main breaks a year across the country and puts nearly 20% of installed mains past their useful life. Your service line was tapped into one of those mains, usually the year the house went up. Once it has leaked twice, main water line replacement is the repair that doesn't need repeating.
The material under your lawn depends mostly on when the house was built. Homes from the 1950s and early 1960s were often plumbed with galvanized steel, which rusts from the inside until the bore closes up and the pressure at your taps drops away. Copper took over through the 1960s and 1970s, and a copper service line lasts a long time, but it develops pinholes where the pressure runs high or the pipe was bedded against a rock. Some 1980s and 1990s homes got polybutylene, a grey plastic that was pulled from the market after widespread failures. Lead is one thing you don't need to worry about here. The City of Mountain View's 2024 water service line inventory found no lead service lines in its system, which matched the City's earlier checks of the same records. When we replace a main water line we dig to the old pipe at both ends, so you'll see exactly what was there. The new run is usually Type K copper or high-density polyethylene, both of which the City's permit allows for a residential service line.
There are two ways to run a water line replacement from the meter to the house, and the yard decides which. A trenchless pull needs one pit at the meter and one at the house wall. A cable goes through the old pipe, a bursting head splits it from the inside, and the new line follows behind it along the same path. Lawn, driveway, and mature roots above the run stay where they are, and the two pits get backfilled the same day. Open trench means a cut along the whole route, which makes sense when the old line runs under nothing worth protecting, when it changes direction underground, when it's too shallow or too collapsed to pull through, or when you want the new line moved to a better route. It also costs less per foot when there's nothing in the way. We locate the old pipe, check what sits above it, and tell you which method fits and why before you see a price. Either way the new line is sized for the house, buried at least 12 inches as the City requires, and tested under pressure before anything is covered.

Your Side of the Meter in Mountain View

The City of Mountain View owns the mains under the street and the meter at the curb. From the meter to your house, the pipe is yours, and so is any leak on it. The City's Water Service Line Replacement Permit covers exactly that stretch for a single-family home or duplex. It sets the approved materials and burial depth, requires grounding and bonding of the electrical service, and calls for a rough and a final inspection. We pull the permit and meet the inspector.

One of these jobs started with a call at midnight: a water leak on the service line, and the city had already turned the water off. Our plumbing service professionals made a small temporary repair that night to restore water, then came back to replace the entire water line from the house to the main. We recommended replacing the whole line rather than leaving the patch in place, because of the age of the property and because high water pressure made more pinhole leaks likely. We also recommended a pressure reducing valve, to help keep that pressure from damaging the new pipes, the fixtures, and the water heater.

Pressure decides how long the new line lasts. California's plumbing code calls for a regulator where static pressure runs above 80 psi, so we gauge it before we start and quote a pressure reducing valve with the replacement if the reading is high. If pinholes are showing inside the house too, pipe replacement for the interior runs is the next conversation.

Our Main Water Line Replacement Process

Nobody gets a price before we've seen the line. We confirm the leak is on your side of the meter, locate the old line, and check what sits above it, then put a gauge on the pressure. You get one written price for the whole job, trenchless or open trench, and that price is fixed before the first shovel goes in, however the ground turns out. We call in the utility locates, pull the City of Mountain View permit, and schedule the work so the water is off for hours rather than days. The new line goes in, gets pressure tested, and passes its rough inspection before anything is backfilled. Then we restore the surface, book the final inspection, and walk you through the new shutoff and the regulator if one went in. Our plumbing service professionals treat the yard like the inside of your house: protected while they work, tidy when they leave. The work is backed by the Neighborly Done Right Promise®, which ensures you'll be happy with the work. To get started, schedule service online with your local Mr. Rooter team.

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Our Main Water Line Replacement Process

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Before You Replace a Water Line in Mountain View

Close the main shutoff at the house with every fixture off. If the meter dial still turns, water is escaping between the meter and the house, so the service line is leaking. If it stops, the leak is indoors. If it's unclear, leak detection settles it before anyone digs.
Usually, yes. A trenchless pull needs a pit at each end of the run and leaves everything between them alone. Open trench is the better call when the old line changes direction underground, runs too shallow, or has collapsed too badly to pull through. We'll say which fits once we've located the pipe.
Yes. The City issues a Water Service Line Replacement Permit for the run between the house and the City meter, with a rough inspection before the pipe is covered and a final inspection when the work is finished. We handle the permit and both inspections as part of the job.
Then it's the City's pipe, and water main repair in the street is their work, not yours. Call the City's water utility. If you're unsure which side it's on, your local Mr. Rooter team in Sunnyvale and Mountain View can confirm it at the meter before you call.
Not necessarily. One leak in a line that's otherwise sound and holds pressure once patched is a fair case for main water line repair, and we'll tell you so. Replacement earns its keep when the pipe is galvanized steel, when this is the second leak, or when the rest of the run is as corroded as the failed spot.

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