Plumbing · Property Services

Main Water Line Replacement

The main water line runs from the street to your house, and when it develops leaks or corrodes, the symptoms include low pressure, wet spots, unexplained bills and discolored water. Replacing it is a big job, but it avoids repeated repairs and damage. NorTech connects you with vetted licensed plumbers who set their own price, coordinate with the water utility and handle permits.

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Signs the main line is failing

Typical signs include sudden drops in pressure, a wet or sunken spot between the meter and the house, a water meter that spins when everything is off, unexplained increases in your bill and rusty or brown water. Galvanized steel and old copper lines are common culprits in older homes. A plumber can confirm a leak with a pressure test and a meter check, and may use a locator to find the line before recommending replacement. Mark irrigation heads, sprinkler lines and any buried items you know about before the crew arrives, so they can avoid damage during excavation.

Trenching, trenchless and surface restoration

The traditional method is an open trench from the meter to the house, which is fast and affordable in soil but disturbs landscaping, driveways and walkways. Trenchless methods such as pipe bursting or pulling dig small entry pits and pull new pipe through, which can save hardscape and plants. The right method depends on the soil, depth, obstacles and budget. Ask the plumber who restores concrete, pavers and landscaping, and whether that is included in the bid.

Pressure, valves, permits and utility coordination

A new line is the right time to install a main shutoff valve you can reach and a pressure regulator that protects fixtures from high street pressure. The plumber calls the dig-alert service before excavation, obtains permits and coordinates with the water utility for the meter connection. Expect water off for part of a day and a pressure test and inspection before backfill. Keep the permit record and ask for photographs of the new line for your files.

When to book main water line replacement

The old galvanized or copper main line is leaking or rusted.

Water pressure at the house has dropped without explanation.

There is a wet or sunken area between the street and the house.

Your water bill rose with no change in use.

You are remodeling and want a larger line for added fixtures.

A plumber recommended replacing the line instead of repairing.

90-Day Warranty

Backed by your provider’s warranty. If covered work fails, your provider makes it right — free.

Looking for a licensed plumber? Bigger jobs and anything that needs a permit go to a verified California C-36 contractor. See licensed plumber services.

Frequently asked

Main Water Line Replacement — common questions

Most projects take one to three days, including trenching, installation, testing and backfill. Hardscape restoration and inspection scheduling may extend the timeline.

Open trenching disturbs a strip of landscaping, while trenchless methods use small pits and cause less disruption. The bid should state what restoration is included.

In most places the owner is responsible from the meter to the house, and the utility handles the street side. Your plumber can confirm the boundary for your address.

Yes. The plumber pulls the permit, schedules the inspection and coordinates with the utility for shutoff and reconnection of the meter. Ask the plumber to schedule the shutoff with the utility.

Often yes, especially if street pressure is high. A regulator protects fixtures and appliances from damage, and it is easy to install while the line is open.

The plumber guarantees the pipe, joints and installation workmanship for 90 days. Landscaping and surface restoration are covered as agreed in the bid, and later ground movement from other causes is not included.

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