What Are Those Pipes Made Of? A Homeowner’s Guide to Plumbing Pipe Types

What Are Those Pipes Made Of? A Homeowner’s Guide to Plumbing Pipe Types

If you own a home, sooner or later somebody is going to ask you what your pipes are made of. The home inspector before you bought it. The contractor quoting a remodel. Your insurance agent asking about polybutylene. A plumber on a service call. And honestly, you should know — because pipe material is one of the strongest predictors of what plumbing problems you’re likely to face, how much they’ll cost to fix, and whether you should be planning a repipe.

Here’s the short version. Modern homes use copper or PEX for supply lines and PVC for drains — these are the good ones. Older homes might have galvanized steel (slowly failing, replace eventually), polybutylene (failing fast, replace soon), or in rare cases lead (replace immediately). Cast iron is common in older drain lines and works fine until it doesn’t. Knowing what you have changes how worried you should be.

We’ve worked on every type of plumbing across Canton, Cherokee County, and North Georgia for over 25 years — from new construction with shiny PEX manifolds to 80-year-old farmhouses with cast iron and galvanized lines that are still hanging on. The walkthrough below covers what each pipe type looks like, how it ages, what to expect from it, and when to worry. If you want a real assessment of what you’ve got, give us a call at (678) 658-3170.

Why Pipe Material Matters

Three reasons every homeowner should know what their pipes are made of:

• Lifespan and failure mode. Different materials fail in different ways and on different timelines. Some fail loudly with a single burst pipe; others fail quietly with decades of slow leaks and corrosion. Knowing what you have tells you what to watch for.

• Insurance and resale. Some pipe types (polybutylene, lead, sometimes old galvanized) can affect home insurance premiums, lender approval, or resale value. Buyers ask. Inspectors flag them. Insurance companies have specific exclusions for some of them.

• Repair vs. repipe decisions. Patching a single leak in good copper or PEX is straightforward. Patching one in failing polybutylene is a delaying tactic on a system that’s going to fail repeatedly. Different materials get different treatment.

You don’t need to be an expert. You just need to know what you’ve got.

How to Identify What You Have

The fastest way: look under sinks, in basements, in crawl spaces, and at the water heater. You’ll see the pipes running. A few things to look for:

• Color. Copper is bronze/orange/green-tinted. PEX is bright red, blue, or white. PVC is white. CPVC is cream or beige. Galvanized is dull silvery-gray. Polybutylene is gray or blue.

• Diameter. Most residential supply lines are 1/2-inch or 3/4-inch. Drain lines are wider — 1.5 to 4 inches.

• Connection type. Threaded (screwed) joints suggest galvanized. Soldered (smooth metal with a thin ring) suggest copper. Crimped rings suggest PEX. Glued white joints suggest PVC.

• Flexibility. Rigid metal = copper or galvanized. Flexible plastic = PEX. Rigid plastic = PVC/CPVC.

Older homes often have a mix — the original galvanized supply lines, copper added in a 70s renovation, PEX from a 2010 remodel, all coexisting. That’s normal and we see it constantly. Just identify what serves which area.

Copper Pipes

The gold standard of residential plumbing for most of the 20th century, and still widely used today.

What it looks like

Smooth, rigid pipe in a bronze or orange color when new. Over time, copper develops a green or blue-green patina from oxidation, especially in humid environments. Joints are typically soldered — a thin smooth ring of solder around the connection.

Lifespan

50–70+ years in most water conditions, sometimes 100+. Copper is genuinely one of the most durable materials in residential plumbing.

Failure mode

Two things kill copper. First: pinhole leaks from electrolytic or acidic water corrosion — small holes that develop over decades. Second: physical damage from freezing or impact. Copper is rigid and doesn’t expand when frozen, so a hard freeze can split it.

Should you worry?

Generally, no. Copper is a strong material. If you have pinhole leaks happening repeatedly (not just one), that suggests acidic water and you might consider a water treatment system. Otherwise, fix individual leaks as they come up and don’t panic.

PEX (Cross-Linked Polyethylene)

The newcomer that took over residential plumbing in the 2000s and 2010s. Almost every new home built since 2015 uses PEX for supply lines.

What it looks like

Flexible plastic tubing in bright red (hot), blue (cold), or white (either). Joints are crimped with metal rings or use special push-fit connectors. The flexibility is the giveaway — PEX bends easily, metal pipes don’t.

Lifespan

Estimated 40–50+ years based on testing, though the material has only been in widespread use since the 2000s, so real-world data on full lifespan is still building.

Failure mode

PEX is more failure-resistant than most materials. It tolerates freezing (expands slightly instead of bursting), resists corrosion entirely, and handles minor impacts without breaking. The main failure modes are: bad crimp connections (installer error), UV degradation if exposed to sunlight, and chewing damage from rodents in some installations.

Should you worry?

No. PEX is excellent. If you’re building or repiping, this is what to use for supply lines unless you have a specific reason to choose copper.

PVC and CPVC

Rigid white plastic. PVC is used almost exclusively for drain lines, vent stacks, and irrigation. CPVC (chlorinated PVC) is a higher-temperature version that’s also used for hot and cold supply lines, particularly in homes built in the 80s and 90s.

What it looks like

White or cream-colored rigid plastic. Glued joints with a smooth bond, often with a faint purple primer residue near the connection. CPVC is usually marked with the letters "CPVC" on the pipe and is slightly off-white compared to PVC.

Lifespan

PVC drain lines: 50–100 years. CPVC supply lines: 30–50 years, sometimes less. CPVC gets brittle with age, especially in hot water lines.

Failure mode

PVC drains rarely fail unless physically damaged (root intrusion, settling, impact). CPVC supply lines get brittle and crack — typically at fittings or in spots that have been bumped or stressed. A common pattern: CPVC homes start seeing leaks at age 25–35.

Should you worry?

PVC for drains: no, it’s fine. CPVC for supply lines: depends on age. If you’re past 25 years and starting to see leaks at joints, it’s worth planning for a repipe before failures become frequent.

Galvanized Steel

Steel pipe coated with zinc, common in homes built before the late 1970s. Was the standard for water supply lines for decades before copper and plastic took over.

What it looks like

Dull silvery-gray metal pipe with threaded connections (screwed joints, not soldered). Often shows rust streaks, especially at joints. The internal diameter looks smaller than the external diameter suggests because of decades of internal buildup.

Lifespan

40–50 years on paper. In real-world Cherokee County conditions, most galvanized pipes installed before 1980 are now well past that threshold.

Failure mode

Galvanized pipes corrode from the inside. The zinc coating breaks down, the steel underneath rusts, and the interior diameter shrinks as rust and mineral deposits accumulate. Eventually you get: low water pressure, brown or rust-colored water (especially when you first turn on a faucet), and pinhole leaks at joints where the threading weakened the pipe walls.

Should you worry?

If your home was built before 1980 and still has galvanized supply lines, yes — these are at end of life. The failure is gradual: declining water pressure (we covered this in our low water pressure causes guide), occasional pinhole leaks, and eventually full pipe failures. Plan for a partial or full repipe. The good news: you don’t usually have to do it all at once, and individual sections can be replaced as they fail.

Polybutylene (The One You Really Want to Know About)

If there’s one pipe material every homeowner in Cherokee County should be able to identify, it’s this one. Polybutylene was used for residential water supply lines between roughly 1978 and 1995. It was cheap, flexible, and easy to install — and it turned out to be a disaster.

What it looks like

Gray or sometimes blue flexible plastic pipe, typically 1/2-inch diameter, with metal or plastic crimp fittings. Sometimes mistaken for PEX at a glance, but PEX is usually red/blue/white and brighter. Polybutylene is usually a flat dull gray. It’s often labeled with "PB2110" or similar stamped along the pipe.

Why it’s a problem

Polybutylene reacts with chlorine and oxidants in normal municipal water. The reaction degrades the plastic from the inside, making it brittle. After 10–20 years (sometimes less), it starts cracking and failing — usually at fittings, but eventually in straight runs as well. A class-action settlement in the 1990s covered some homeowners’ replacement costs, but that program has long since closed.

Lifespan

Originally rated for 50+ years. Actual real-world lifespan: 10–25 years before failures start, and most installations are now well past that threshold. If you have polybutylene in 2026, it is past due to fail.

Should you worry?

Yes. If your home has polybutylene supply lines, plan for a repipe. Many home insurance policies exclude water damage from polybutylene failures, and some insurers won’t write coverage at all on homes that still have it. It’s also a real issue at resale — buyers and their inspectors flag it.

The fix is a full repipe to PEX or copper. It’s a real project ($5,000–$15,000+ depending on house size and access) but it’s a permanent fix for one of the most predictable plumbing failures in modern housing.

Cast Iron (Drain Lines, Not Supply)

Heavy black or dark gray pipe used for drain lines, vent stacks, and sewer lines in homes built before the 1980s. Cast iron is one of the longest-lasting plumbing materials when intact, but eventually corrodes from the inside.

What it looks like

Heavy, rigid, dark-colored metal pipe. Usually larger diameter (2–4 inches) since it’s for drains, not supply. Joints are hub-and-spigot (one pipe slips into a bell-shaped end of the next) and sealed with lead and oakum in older homes, or compression couplings in newer.

Lifespan

75–100 years when undamaged. Many homes built in the 50s and 60s still have functional cast iron drains in 2026.

Failure mode

Cast iron corrodes from the inside, especially in horizontal sections where water sits longer. The interior wall thins, surface becomes pitted (which catches debris and accelerates clogs), and eventually the pipe gets thin enough to crack or fail. Joints can also fail if the lead-and-oakum seals dry out.

Should you worry?

Depends on age and symptoms. If your cast iron drains are working without recurring clogs and there are no signs of leaks at joints, leave them be — they can last decades more. If you’re seeing recurring slow drains in the same line, gurgling, or visible corrosion at joints, the line is heading toward end of life. Repair or replacement of failing sections is straightforward; we use trenchless methods where possible to avoid major demolition.

Lead Pipes (Rare but Critical)

Lead supply pipes were used in some homes before the 1950s, mostly for the line from the city main to the house. After health concerns emerged in the 1970s and 80s, lead was banned for new installations and most older lead lines have been replaced.

What it looks like

Dull gray, soft metal pipe that’s easy to scratch with a coin or key. Lead is denser than other metals — a lead pipe of the same size weighs noticeably more than copper or galvanized. It can also have a slightly bluish tint.

Should you worry?

Yes — if you find lead, replace it. Lead leaches into drinking water, particularly when water sits in the pipes overnight or when the water is acidic. There is no safe level of lead in drinking water. The EPA recommends immediate replacement of any lead service lines.

If you suspect lead and aren’t sure, water-testing kits can confirm. We can also pull the pipe at a junction to identify the material for certain. In Cherokee County, lead supply lines are uncommon but not unheard of, especially in homes from before 1960.

When to Consider a Repipe

A full repipe — replacing all the supply lines in a home with new copper or PEX — is one of the bigger plumbing projects. It’s rarely urgent, but here’s when it makes sense to plan one:

• Polybutylene supply lines, any age. Plan it. Not "if" but "when."

• Galvanized supply lines over 50 years old. Especially if you’re already seeing pressure drops, rust water, or pinhole leaks.

• CPVC supply lines over 30 years old, especially if failures are starting to repeat. Multiple CPVC leaks in a year usually mean more are coming.

• Lead supply lines, regardless of age or condition. Immediate replacement.

• Major renovation. If you’re opening up walls anyway, that’s the cheapest moment to repipe.

• Selling a home in the next 1–3 years. A repipe before listing turns a buyer objection into a selling point.

Repipes typically run $5,000–$15,000 for an average Cherokee County home, depending on size, accessibility, and whether you choose PEX (cheaper, faster) or copper (more expensive, traditional). We can usually do a typical home in 2–5 days with minimal demolition — modern PEX repipes can often be done by snaking new lines through existing wall cavities, leaving most drywall intact.

Frequently Asked Questions

How do I know if I have polybutylene pipes?

Look for gray (sometimes blue) flexible plastic pipe, usually 1/2-inch in diameter, with crimped fittings. The pipe is often labeled with markings like "PB2110" stamped along its length. Polybutylene was used between roughly 1978 and 1995, so if your home was built or replumbed in that window, it’s worth checking. The easiest place to look is under sinks or at the water heater. If you’re unsure, we can identify it on a quick service call.

Is PEX or copper better for a repipe?

Both are excellent, with different trade-offs. PEX is cheaper, faster to install, more freeze-resistant, and easier to retrofit through existing walls with minimal demolition. Copper is more traditional, perceived as higher-quality (which affects resale slightly), and lasts longer in pure-water conditions. For most Cherokee County homeowners, PEX is the smart practical choice. Copper makes more sense for high-end homes or in specific cases where appearance matters (exposed plumbing in finished basements, etc.).

Does galvanized pipe affect water quality?

Yes, somewhat. Old galvanized pipes shed rust and zinc into the water supply over time, which is why you often see rust-colored water from older galvanized homes when the water has been sitting. The zinc itself isn’t a major health concern, but the rust isn’t great and the diminished pressure from internal buildup affects daily life. Lead contamination is also possible in very old galvanized systems where lead solder was used at joints.

How long does a repipe take?

A typical Cherokee County home (2–4 bedrooms, single-story or two-story) takes 2–5 days for a PEX repipe, sometimes longer for copper or complex layouts. Water service is usually only off for a few hours each day, and most of the work happens behind walls without major demolition. We schedule it to minimize disruption — most homeowners can stay in the house during the project.

Will a repipe increase my home’s value?

A modern repipe (especially replacing polybutylene or aging galvanized) typically returns 60–80% of cost at resale, similar to other major systems upgrades. But the bigger value is removing a buyer objection. Homes with known-bad plumbing materials often sit longer on the market and get lower offers. Repiping turns "potential issue" into "already handled" — buyers and inspectors love that.

Do you do repipes in Canton and Cherokee County?

Yes — we do partial repipes (single sections, like replacing a galvanized run with PEX) and full whole-house repipes throughout Canton, Woodstock, Holly Springs, Ball Ground, and the surrounding area. We can typically inspect your existing system and quote a fixed price within 1–2 days of your initial call. Call (678) 658-3170 to schedule a no-pressure assessment.

Not Sure What You’ve Got? We’ll Tell You

Knowing what your pipes are made of is one of those background facts that ends up mattering more than you expect — when an insurance question comes up, when you’re planning a renovation, or when something starts to leak. If you’re not sure what you’ve got under your sinks and in your walls, that’s an easy thing for us to figure out on a service call, and worth knowing before you have a problem.

Precision Plumbing & Septic does pipe identification, partial and full repipes, water line repair, and full plumbing service across Canton, Woodstock, Holly Springs, Ball Ground, and the rest of Cherokee County. We’ll tell you straight what you have, whether it needs attention, and what a repipe would actually involve if it comes to that — no scare tactics. Call (678) 658-3170 or book online — we’re available 24/7.