Understanding what's in your walls helps you make an informed repiping decision. Here is every supply pipe material you are likely to encounter in a Los Angeles home.
SUPPLY PIPE
Copper Type M
Thin-wall · Most common new install
The standard for most residential new construction and repiping in LA. Type M has the thinnest wall of the copper types — adequate for household water pressure but more susceptible to pinhole leaks in LA's hard water over time. Cost-effective and code-compliant.
Lifespan: 40–70 years · Best for: Standard residential repiping
SUPPLY PIPE
Copper Type L
Medium-wall · Commercial & premium residential
Thicker wall than Type M — more durable, longer lasting, and better suited for LA's corrosive hard water. Type L is our recommendation when copper is the material of choice, particularly for water heater connections and high-pressure applications.
Lifespan: 50–80 years · Best for: Water heaters, high-pressure runs, premium repiping
SUPPLY PIPE
Copper Type K
Thick-wall · Underground & commercial
The heaviest-duty copper pipe — used for underground service lines, commercial applications, and any run requiring maximum durability. Rarely used inside walls for residential repiping due to cost, but the right choice for water service entry lines.
Lifespan: 60–100 years · Best for: Underground runs, commercial, water service entry
⭐ OUR TOP RECOMMENDATION
PEX-A (Expansion PEX)
Flexible · Most durable PEX · Uponor / Rehau
The highest-quality PEX pipe, manufactured using the Engel (peroxide) method. PEX-A has the most flexible cross-linking, meaning it can be expanded for connections (no crimp rings), has excellent freeze resistance, and has the best long-term performance of any PEX type. This is what we use when we repipe with PEX.
Lifespan: 50+ years · Best for: Whole-home repiping — our preferred material
SUPPLY PIPE
PEX-B (Silane PEX)
Flexible · More common · Good value
Manufactured using the silane (moisture cure) method. PEX-B is slightly stiffer than PEX-A and uses crimp or clamp connections instead of expansion fittings. Widely available and cost-effective. Good performance in most residential applications — just a step below PEX-A in long-term flexibility and fitting security.
Lifespan: 50+ years · Best for: Residential repiping where PEX-A is not specified
SUPPLY PIPE
CPVC
Chlorinated PVC · Hot & cold water
CPVC (Chlorinated Polyvinyl Chloride) handles hot water — unlike standard PVC which is drain pipe only. Used in some residential repiping in the 1980s-90s. CPVC is rigid, connects with solvent cement, and performs well — but can become brittle with age and is being replaced by PEX in most new installs due to PEX's superior flexibility and connection security.
Lifespan: 50–75 years · Status: Still code-compliant, less common in new installs
⚠️ END-OF-LIFE PIPE
Galvanized Steel
Steel with zinc coating · Pre-1960s homes
Galvanized pipe was standard in homes built before the 1960s. The zinc coating that protects it from rust eventually wears away — after which the steel corrodes from the inside out, narrowing the pipe diameter and releasing rust and scale into the water. Brown hot water, persistent low pressure, and frequent leaks are the classic signs. If your home has galvanized supply lines, repiping is not optional — it's overdue.
Lifespan: 40–70 years · Action: Replacement strongly recommended if original
SPECIALTY PIPE
Brass
Durable · Fittings & valves
Brass pipe itself is extremely durable and corrosion-resistant — but it is rarely used for main supply runs due to cost. Where you will encounter brass is at fittings, shut-off valves, hose bibs, and angle stops. Quality brass fittings are what we use at connections in PEX and copper systems. Lead-free brass (California code requirement) contains less than 0.25% lead.
Lifespan: 50–100 years at fittings · Requirement: Lead-free brass per CA code
Our Recommendation for LA Homes
For most whole-home repiping jobs in Los Angeles, PEX-A is our top recommendation. It handles LA's hard water without the pinhole leak issues copper develops over decades, installs faster (reducing labor cost), is rated 50+ years, and is code-approved throughout California. Expansion fittings create a more secure connection than crimp rings.
For customers who prefer copper — or where building HOA rules, buyer preference, or local code variants require it — we recommend Copper Type L for its thicker wall and better longevity in our hard water environment.
We will never tell you there is only one right answer — we will assess your home, explain the tradeoffs, and give you an honest recommendation for your specific situation and budget.
