Copper vs. PEX: Is It Time to Repipe Your Older Mountain Cabin?

Many of the cabins we work on in Lake Arrowhead, Cedar Glen, and Twin Peaks are 50 to 80 years old—and a surprising number still run on their original water supply pipes. If your home has galvanized steel pipe, or aging copper that’s developed pinhole leaks, a whole-home repipe is somewhere in your future. The good news: today’s options are excellent, and the right choice depends on your home and your priorities.

O’Brien Plumbing installs both copper and PEX repipes throughout the mountain communities. Here’s the honest comparison we give our customers.

Signs Your Cabin Needs Repiping

• Rusty or discolored water: Brown or yellow water, especially first thing in the morning, points to corroding galvanized pipe.
• Low water pressure: Corrosion narrows galvanized pipe from the inside until a shower turns into a trickle.
• Repeated pinhole leaks: One pinhole in copper is a repair. The third one in two years is a pattern—and a warning.
• Visible corrosion at joints: White, green, or rusty crust on exposed pipes in the crawl space means the system is failing from the outside too.

The Case for Copper

Copper has been the premium standard for decades, and for good reason. It’s durable, naturally resistant to bacteria, unaffected by UV light, and rodents don’t chew it—a real consideration in mountain crawl spaces. A quality copper repipe can last 50 years or more. The tradeoffs: it costs more in both material and labor, and as a rigid metal pipe, it’s more vulnerable to bursting if it freezes—something every mountain homeowner has to think about.

The Case for PEX

PEX (cross-linked polyethylene) is flexible tubing that has become the most popular repiping material in the country. It costs less, installs faster with fewer fittings buried in walls, and—critically for homes up here—its flexibility lets it expand rather than split when water freezes inside it. That doesn’t make it freeze-proof, but it survives cold snaps that burst rigid pipe. The tradeoffs: it can’t be exposed to sunlight, and rodents can occasionally gnaw it, so smart routing and protection matter—details an experienced mountain plumber plans for.

Which One for a Mountain Home?

There’s no single right answer. For many cabins in freeze-prone areas like Green Valley Lake and Arrowbear, PEX’s freeze tolerance and lower cost make it the practical favorite. For exposed runs, rodent-prone crawl spaces, or homeowners who simply want the premium option, copper—or a hybrid of the two—makes sense. When we quote a repipe, we look at your home’s layout, insulation, and history and recommend accordingly, with pricing for each option.

What a Repipe Actually Involves

A whole-home repipe sounds disruptive, but a practiced crew keeps it contained: most homes are done in two to five days, water is typically back on each evening, and drywall access openings are kept small and mapped for easy patching. Compared to years of chasing leaks through a failing system, it’s a one-time reset that also tends to pay off in water pressure you’ll notice the first day.

Get a Straight Answer on Your Pipes

Not sure whether your cabin needs a repipe now or in five years? We’ll tell you honestly—we’ve been serving Lake Arrowhead, Crestline, and the surrounding mountain communities for over 25 years, and repiping a home before it fails is always cheaper than after. Call O’Brien Plumbing at (909) 337-3743 or schedule an appointment online for a free estimate on copper or PEX repiping.

Frequently Asked Questions About Repiping