What repiping means and why homeowners do it
Repiping replaces old water supply lines with new pipe. It is not about drains. You do it when pipes keep leaking, water looks rusty, pressure has dropped, or the plumber finds the material at the end of its life.
A repipe is planned work, unlike burst pipe repair, which is a one-time emergency fix. If you already have a leak under a slab, slab leak repair covers rerouting that line.
Signs your supply lines need replacing
A single leak is a repair. A pattern is a repipe.
- Repeated pinhole leaksTwo or more leaks in a year point to pipe that is failing along its length.
- Rusty or discolored waterGalvanized steel corrodes from the inside and can turn water brown.
- Falling pressureMineral and rust buildup narrows old pipe.
- Visible corrosionGreen or white crust on copper, orange rust on steel.
- Age of the plumbingPipes installed in the 1950s to 1970s may now be at the end of their service life.
PEX or copper
Both are good materials with different strengths.
| Material | Strengths | Trade-offs |
|---|---|---|
| PEX | Flexible, fewer fittings, quicker install | Needs protection from sunlight and some chemicals |
| Copper | Long track record, heat tolerance | More labor, more cost, can pinhole in some water |
| CPVC | Rigid plastic, low cost | Brittle with age, less common now |
The plumber recommends one after looking at access, water chemistry and budget.
Santee housing age and a repipe decision
Santee grew from under 2,000 people in 1950 to 25,750 in 1970, and the city incorporated in 1980. That growth window produced a lot of housing, which means supply pipe in many homes is now fifty years old or more. If you have copper that has leaked more than once, a repipe may be cheaper than patching.
The City of Santee says replacing a failed concealed water pipe is new work that requires a permit. Ask Planning and Building what your repipe needs.
Sources: City of Santee history page, City of Santee, Work Not Requiring a Building Permit.
How a repipe is done
A careful plan keeps living space usable.
- 1
Survey and plan
The plumber maps the existing lines, fixtures and shutoffs, and picks a material.
- 2
Set a work schedule
You learn how long water will be off and which rooms are affected.
- 3
Run the new lines
New pipe goes through walls and attic or crawlspace, with minimal openings.
- 4
Test, patch and restore
The system is pressure tested before any wall is closed.
What to expect during a repipe
A repipe disturbs a house for a short, planned window. Water is shut off in the home while the old lines are removed and the new ones are connected, and the plumber tells you ahead of time how long that will be. Most of the pipe runs through attics, crawlspaces and walls, and access holes are kept small and patched afterward.
You should plan for a few things before the crew arrives. Clear space around the water heater, the main shutoff and the fixtures. Move items off the walls where openings will be made. Keep children and pets away from the work area. After the lines are in, the system is pressure tested, flushed and inspected, and any permit inspection is scheduled with the city.
Standards for pipe and fittings in a repipe
Repipe materials should be listed for potable water. PEX tubing is made to ASTM F876, and plumbing materials that touch drinking water are certified to NSF/ANSI 61. Copper is made to ASTM B88. The California Plumbing Code, based on the Uniform Plumbing Code (UPC), sets approved materials and installation methods.
Ask to see the markings on the pipe and the fitting system the plumber plans to use. A clear answer shows the work is planned against recognized standards.
What affects the cost of repiping
Price follows the size and access of the house.
Repiping questions
Yes. If a pipe has burst, call the 24/7 line. See burst pipe repair. We can plan the repipe afterward.
Many homes take a few days. Larger or two-story homes take longer.
Water is off during the work. The plumber plans around your schedule.
The plumber uses attic and access points where possible to minimize openings.
PEX is widely used for home water systems. It needs proper fittings and protection from sunlight.
The City of Santee considers replacing a failed concealed water pipe new work that needs a permit. Ask the department about your project.