Main Water Line Replacement in Sunnyvale, CA
Underground Runs From the Meter to the House. Replacements, New Service Lines, and ADU Connections.
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Main Water Line Options for South Bay Properties
One pipe carries everything from the municipal meter to the house. Its size, material, and route set the pressure and flow every fixture on the property will ever see.
Aging Main Line Replacement
Full replacement of galvanized, polybutylene, or corroded service lines behind low pressure, discolored water, and leaks that keep returning. Trench or trenchless, depending on what sits above the route.
Underground copper service line from the municipal meter to a new home or a property that has never had one. Sized for the structure from the start.
ADU Service Line
A dedicated main line for an ADU that needs its own meter and its own connection. Coordinated with the utility and permitted through the city.
Replacing the Line That Feeds Everything Else
The service line is the only pipe on the property with no backup. When it corrodes, pressure drops at every fixture at once, and no amount of work inside the walls changes that. Replacing it is an underground job with consequences measured in decades, which is why the route and the diameter get decided before anyone breaks ground.
Copper is our default material. It holds up in local soil, resists the scale that hard water leaves behind at 7 to 19 grains per gallon, and meets code across Santa Clara County. PEX goes in where site conditions call for it.
The ground here is not uniform. Expansive clay swells and shifts with the seasons, hillside lots turn rocky a foot down, and setbacks decide where a line can legally run. We locate utilities, confirm the diameter, and route around what is already buried.
Where a driveway or mature landscaping sits over the route, pneumatic moling pulls the new line through without opening a trench across it.
The scope stays with our own crew: locating, permits, excavation or boring, the connection at the meter, inspection, and site restoration.
Main Water Line Replacement
New Service Line Installation
Pressure and Flow Assessment
Full Permit and Inspection Handling
Connection to the Municipal Supply
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Underground Work Requires the Right Experience
Connecting a property to the municipal supply has little in common with fixing a leak inside the house. It takes utility coordination, excavation, soil judgment, and a municipal inspection at the end. We have done this work across South Bay ground: expansive clay, sandy fill in low-lying areas, and rocky hillside lots.
Our licensed plumbers pull the permits, coordinate with the utility, run the underground work with our own crew and equipment, and walk the inspection. One point of contact from the first dig to the final sign-off.
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Replacing a Line or Running a New One?
Both jobs end with a new service line in the ground. What differs is everything that has to happen before that.
Feature
Replacing an Existing Line
New Service Line
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What Our Customers Say
Permits and Utility Coordination
Main water line work requires coordination with the local water utility and a permit from the city. We manage this process on your behalf so the new connection is approved and properly documented.
Product & Labor Warranty
Licensed, Bonded & Insured (C-36 #1139033)
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Fast Callback Times
Free, No-Obligation Estimates
Same-Day Service and Flat-Rate Pricing
Many main water line projects can be started the same day they’re scheduled, with a flat-rate quote provided after a free site assessment, so you know the full cost before any digging begins.
Signs Your Main Line Needs Replacing
A handful of warning signs suggest a main water line may be nearing the end of its life rather than just having an off day. Noticeably lower water pressure throughout the entire house, water that runs discolored right after the meter, an unexplained spike in your water bill, or a damp or soggy patch in the yard near the service line can all point to a failing main. Because this line is buried and easy to overlook, many homeowners don’t catch the problem until pressure has dropped significantly or a section has already failed.
Service Areas
Main Water Line Work Across the South Bay
We replace and install service lines in:
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Call us at (650) 495-4570 and there is a good chance we cover it.
Serving Sunnyvale and the South Bay
We install main water lines throughout Sunnyvale and nearby Redwood City, Santa Clara, San Jose, and Fremont. Contact us to schedule a free assessment for a new or replacement main line.
GALLERY
Recent Main Line Work Across the South Bay
Service lines replaced, connected at the meter, and backfilled
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Frequently Asked Questions
Where does my responsibility for the water line begin?
In most South Bay cities the utility owns the meter and everything on the street side of it. From the meter to the house, the line belongs to the property owner, and so does the repair bill. That split is why a leak between the meter and the foundation shows up on your water bill rather than the utility’s.
Can the line be replaced without digging up the driveway?
Often yes. Pneumatic moling drives a new line under a driveway or a lawn from a pit at each end, so the surface between them stays intact. Whether it works on your property depends on the soil and on what else is buried along the route, which is what the site assessment is for.
What are the signs that a service line is failing?
Pressure that has dropped everywhere at once rather than at one fixture. Water that runs discolored at every tap after the house has been quiet. A meter that keeps turning with every fixture closed. Wet ground or unusually green grass along the line between the meter and the house.