Whole-House Repiping in Poway

What is whole-house repiping?

Whole-house repiping replaces the water supply lines throughout a home, from the main line to every fixture, with new pipe, usually PEX or copper.

It's the long-term fix when the pipes themselves are the problem. Galvanized steel, once standard in American homes, rusts from the inside until the opening is a fraction of its original size. Polybutylene, a gray plastic used in many homes built in the 1980s and early 1990s, is known for sudden failures. Even copper can thin out and develop pinholes over decades.

When old pipe narrows, pressure fades slowly. No single fixture is to blame, and cleaning aerators or replacing valves only helps briefly. If a plumber's tests show the restriction is in the lines, a repipe is often the most reliable form of water pressure repair Poway CA homeowners can invest in, because it fixes pressure, water quality and leak risk at the same time.

How does a whole-house repipe work?

A repipe is a planned project rather than a repair. Done well, it's methodical and less disruptive than most people expect.

Planning the routes

The plumber maps where each fixture is and decides how new lines will reach them, usually through the attic or crawl space and down interior walls. In single-story slab homes, overhead routing avoids running new pipe under the foundation at all.

Running new lines

New supply lines are run alongside the old ones before anything is disconnected. PEX can be pulled through walls in long, continuous runs, sometimes from a central manifold that feeds each fixture separately. Copper is cut and joined in sections. Small openings are made at each fixture to connect the new pipe.

Switching over and testing

Once the new system is in place, it's connected at the main and each fixture, typically with new shutoff valves. The lines are pressure tested for leaks, then inspected if a permit was pulled. The old pipe is usually abandoned in place, and wall openings are patched.

What are the signs a house needs repiping?

Pipes rarely fail all at once. These eight signs, especially in combination, suggest the system is near the end of its life:

1. Pressure that has faded over yearsNo single day when it dropped, just a slow slide from strong to disappointing at most fixtures.
2. Brown or rusty waterDiscolored water, especially first thing in the morning or after a trip, points to corroding steel pipe.
3. Pinhole leaks in more than one placeSmall leaks appearing in different walls or ceilings suggest the pipe is thinning throughout.
4. Visible galvanized or gray plastic pipeDull silver threaded steel or gray polybutylene under sinks or at the heater are materials known to fail.
5. Good static pressure, poor flowA gauge reads fine with nothing running but pressure collapses when a fixture opens, showing restriction inside the pipes.
6. Repeated slab leaksA second or third leak under the foundation on the same line means the line itself is wearing out.
7. Corrosion at fittingsGreen crust on copper joints or rust and weeping where steel meets copper signals ongoing deterioration.
8. Metallic taste or sedimentA metallic taste or particles in water that clear after running suggest material breaking down inside the lines.

If rust and grit are showing up mainly in faucet screens, cleaning them is a reasonable first step. Our guide to aerator and supply line cleaning covers that, but if the debris keeps coming back, the source is the pipe.

What causes household pipes to fail?

Pipe failure comes down to material, age and the conditions the pipe lives in.

• Galvanized corrosion. The zinc coating on steel pipe wears away over decades, and rust builds up inside until flow is choked off.
• Polybutylene breakdown. This plastic can become brittle and crack, often at fittings, with little warning.
• Galvanic corrosion. Where copper connects directly to steel without a proper dielectric fitting, the joint corrodes faster.
• Water chemistry and velocity. Aggressive water or very fast flow in undersized pipe can thin copper from the inside.
• High pressure. Pressure above the safe range stresses every joint and accelerates leaks.

Older homes in areas like Old Poway are the most likely to still have original steel pipe. Homes that have had more than one under-slab failure, a topic covered in our slab leak detection guide, are also strong candidates for rerouting or repiping.

How can I check my pipes before calling?

You can learn a lot about your plumbing in a few minutes with a magnet and a flashlight.

• Look at exposed pipe under sinks, at the water heater and where the main enters the house. Note whether it's copper, dull gray threaded steel, gray plastic or colored PEX.
• Hold a magnet to any gray metal pipe. A magnet sticks to galvanized steel but not to copper or plastic.
• Run a cold tap first thing in the morning into a white cup and look for discoloration.
• Take a static and a flow gauge reading at an outdoor hose bib. A big gap between them suggests restriction inside the pipes.
• List any past leaks, where they were and when, for your plumber.

What does a professional repipe involve, step by step?

Here's how a typical repipe project unfolds.

1. Assessment

   Pipe materials, pressure readings and leak history are reviewed to confirm a repipe is the right fix.

2. Plan and estimate

   Routes, material, number of openings, permits and schedule are explained in a written estimate.

3. Protect and prepare

   Floors and furniture are covered, and access points in walls and ceilings are marked.

4. Install new lines

   New pipe is run to each fixture while the old system stays in service as long as possible.

5. Connect and test

   Fixtures are connected with new shutoffs, and the system is pressure tested for leaks.

6. Inspect and patch

   The work is inspected if permitted, wall openings are patched, and pressure is checked at the taps.

Before the crew leaves, ask them to walk you through the new shutoff valves and where the main line now enters. Knowing your system makes future maintenance easier.

What affects the cost of whole-house repiping?

A repipe is a significant project, and estimates can differ for good reasons. These factors account for most of the difference.

When is a pipe problem an emergency?

A burst pipe, water running inside a wall, a ceiling stain that grows by the hour, or water near electrical panels all need immediate action. Old pipes that have been leaking in one place are more likely to fail nearby too.

Close the main shutoff right away and turn off power to any wet area if you can do so safely. Then call. Planned repiping can be scheduled once the emergency is under control.

Whole-house repiping FAQs

Not sure whether pipes are the culprit? Learn the other ways to restore strong water pressure before committing to a repipe.