Water Service Line Installation
Service line installation is project work, not rescue work: a new building, an ADU getting its own connection, an addition that moved the demand math, a route that must relocate. Nothing is leaking; something is being built, and the line from meter to structure is part of its foundation infrastructure.
This page covers designing and installing that new run on the private side. Replacing a failed existing line is its own page with its own logic; interior piping belongs to repiping. The boundary that matters here is the meter, where utility work ends and this project begins.
How a Plumber Diagnoses the Problem
What gets decided before the first foot of pipe:
- The connection point. Where the utility hands off (existing meter, new tap, curb stop) and what the utility itself must perform versus what the plumbing scope covers. That split is locality-specific and settled first.
- Size from demand, not habit. Fixture count, building distance and pressure at the street size the line per code, the calculation that decides whether the new building gets strong showers or a lifetime of apologies.
- Route, depth and frost. The path chosen around trees, structures and other utilities, buried below local frost depth with proper bedding: geography written into the design before anything is dug.
- Trench or bore. Open trench where the route is clear; directional boring under driveways, walks and established landscaping. The site plan, not preference, picks the method.
- The code furniture. Shutoff placement, sleeve requirements at crossings and the foundation, backflow and pressure-regulation provisions where rules require them: the details inspectors actually check.
Service Details & What's Included
The projects this page serves:
- New construction. First service to a new building, coordinated with the utility's tap schedule and the site's other trades. The line arrives before the drywall ever could.
- ADUs and additions. A second dwelling or major addition either shares the existing line, if sizing allows, or earns its own; the demand calculation makes that call honestly.
- Reroutes. A line moved out of a planned foundation, pool or garage footprint: installation logic applied to a property that already has service.
- Capacity upgrades. An undersized old run replaced by design as part of a renovation, the project cousin of replacement, planned rather than forced.
Frequently Asked Questions
What is involved in installing a new water service line?
Design first (connection point, route, depth, size, material), then permits, then the build: excavation or boring, pipe laid on proper bedding, shutoffs and code items set, pressure test, inspection, backfill. The digging is the visible half; the design and paperwork are what make it pass.
Who connects at the meter or curb?
Typically the utility handles its side, the tap and the meter itself, and the private scope runs from that handoff to the building. Where exactly the line of ownership sits varies by locality, which is why the first project step is confirming it rather than assuming it.
Can a new line serve an ADU or addition?
Yes, two ways: a dedicated new service where the utility allows a second connection, or an upsized shared line feeding both structures. Fixture-count math and local policy decide between them; the wrong guess shows up later as two buildings sharing one weak shower.
Trench or directional boring: which will it be?
Whichever the route argues for: open trench is economical across clear ground; boring earns its keep under driveways, hardscape and root zones. Many projects mix both. It is a per-site calculation made during design, with restoration costs counted on both sides of the ledger.
What materials are used for new service lines?
Locally approved pressure pipe. Continuous plastic runs dominate for their jointless lengths, with copper in some jurisdictions and specifications. The material list is ultimately the local code's to write; the design step confirms it rather than importing habits from elsewhere.
What affects installation cost?
Run length and required depth, trench versus boring, what the route crosses, the utility's connection requirements, permit and inspection fees, and surface restoration. New-construction sites with open ground sit at one end of the range; occupied properties with hardscape at the other.
Plan the New Service
Describe the project (new build, ADU, addition or reroute), plus the distance from meter to structure and the property's plans. The design conversation with the utility's requirements comes first and shapes everything after.
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