Note to readers: This post was updated on July 20, 2026 to reflect current PEX piping standards and certifications, and add links to our repiping comparison guides. We refreshed the details below so the advice reflects how we approach this work today.
If you’ve had a plumber recommend repiping your home, there’s a good chance PEX came up. PEX (cross-linked polyethylene) has become one of the most common piping materials for residential water lines in California over the last decade, and for good reason — it’s flexible, durable, and typically faster and less expensive to install than rigid copper.
What Is PEX Piping?
PEX is a flexible plastic tubing used for both hot and cold water supply lines. Unlike copper, which comes in rigid straight lengths that need soldered joints at every turn, PEX can bend around corners and snake through walls and framing with far fewer fittings. Fewer fittings means fewer potential leak points down the road.
Our technicians use certified PEX piping systems from major manufacturers, and we’ve completed factory training and certification on proper installation methods, fitting standards, and expansion techniques so every repipe is installed to spec.
PEX vs. Copper: The Real Differences
- Cost: PEX material and labor typically run less than copper, since installation is faster and requires less soldering.
- Freeze resistance: PEX has some flexibility to expand slightly under freezing conditions without splitting, unlike rigid copper.
- Corrosion: PEX doesn’t corrode or pit the way copper can in areas with aggressive water chemistry.
- Lifespan: Both materials can last decades when installed correctly; copper has a longer track record, but PEX has performed well since becoming code-approved in most California jurisdictions.
- Where it can’t go: PEX isn’t rated for exterior exposure to direct sunlight (UV breaks it down) and isn’t used for gas lines.
We cover this in more detail in our comparison of PEX vs. copper pipes in California and our guide to copper repiping vs. PEX for San Gabriel Valley homes.
Signs Your Home May Need Repiping
- Discolored or rusty-looking water, especially right after the water’s been off for a while
- Noticeably low water pressure throughout the house, not just at one fixture
- Frequent pinhole leaks or repeated pipe repairs in different spots
- Visible corrosion or green staining on exposed copper pipes
- A home built before the 1980s that still has its original galvanized or copper supply lines
If you’re seeing more than one of these, it’s worth having a plumber take a look before a small leak becomes a wall full of water damage. Our guide on plumbing problems to avoid covers more early warning signs.
What a Repipe Involves
A full home repipe means running new supply lines to every fixture — sinks, showers, toilets, water heater, washing machine. Depending on your home’s layout, that can mean opening some drywall to route new lines, though experienced crews minimize the damage and patch as they go. Most residential repipes take one to a few days depending on the size of the home and number of fixtures.
When to Call a Pro
Repiping isn’t a DIY project — it involves shutting down your home’s water supply, working inside walls, and making sure every joint and fitting meets code. A botched repipe can mean leaks you don’t discover until there’s already damage behind a wall. If you’re noticing pressure problems, discolored water, or you know your home still has its original 1960s-70s copper or galvanized lines, it’s worth getting a professional assessment. We offer repipe specialist visits across Pasadena, Arcadia, and the surrounding San Gabriel Valley to evaluate what’s actually going on and give you options — PEX, copper, or a mix — based on your home and budget.
