Cast iron waste stacks and water lines roughed in behind metal studs on a commercial building floor

7 Common Types of Plumbing Pipes: A Homeowner’s Guide

By Court Lundberg

When it comes to your home’s plumbing system, the pipes behind the walls play a critical role in keeping everything running smoothly. From delivering clean water to removing waste, the materials used in your plumbing system directly affect durability, efficiency, and long-term performance.

Many homeowners don’t think much about their pipes until a leak or plumbing problem occurs. However, understanding the types of plumbing pipes used in residential systems can help you make informed decisions when repairing, remodeling, or upgrading your home. Let’s explore 7 different types of plumbing pipes, their uses, advantages, and how to determine which material may be present in your home.

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Why Pipe Materials Matter

Not all pipes serve the same purpose, and not every material works for every situation. Some pipes are designed to handle hot water and pressure, while others are intended for drainage systems. The materials chosen affect installation cost, corrosion resistance, and lifespan.

Older homes may contain materials that are no longer commonly installed today, while newer houses typically use modern alternatives designed for efficiency and longevity. When plumbing systems are upgraded or repaired, the type of pipe used determines how long those improvements last. The best type of pipe for plumbing depends on several factors, including the location of the pipe, the type of water system it serves, and the age of the home.

7 Different Types of Plumbing Pipes Often Found in Homes

Several types of plumbing pipes are used in residential systems, each with unique strengths, applications, and lifespans. Some materials are designed for delivering drinking water, while others are intended for drainage and waste removal. Here are 7 different types of plumbing pipes commonly found in homes:

1. Copper Pipes

Copper pipes have been a trusted plumbing material for decades and remain one of the most recognizable pipe types in residential systems. These pipes are typically used for water supply lines that deliver clean drinking water throughout the home.

Copper is valued for its durability. It resists corrosion well, handles high water pressure, and can last for many decades when properly installed. Many homeowners also appreciate that copper is naturally resistant to bacterial growth, which makes it a safe option for drinking water systems.

However, copper pipes tend to be more expensive than many modern alternatives. Installation also requires specialized tools and techniques, which usually means professional installation is necessary. Over time, copper pipes may develop small pinhole leaks, especially in areas where water chemistry contributes to corrosion. Even with these considerations, copper remains one of the most respected types of plumbing pipes used in residential systems.

2. PEX Pipes

PEX piping has become extremely popular in modern plumbing installations. The material, which stands for cross-linked polyethylene, is flexible and relatively easy to install.

One of the biggest advantages of PEX is its flexibility. Unlike rigid pipes, PEX can bend around corners and obstacles, reducing the need for multiple fittings and joints. Fewer joints often mean fewer opportunities for leaks to develop. PEX is also resistant to freezing damage. When water inside the pipes freezes, the material can expand slightly rather than cracking immediately, which makes it especially useful in colder climates. Yet another reason PEX is commonly used in modern homes is cost efficiency. Compared with copper piping, PEX is typically more affordable and quicker to install.

Despite its advantages, PEX does have some limitations. It should not be installed in areas exposed to direct sunlight because ultraviolet rays can weaken the material. Even so, it remains one of the most widely used types of pipes for plumbing in newer homes and repiping projects.

3. PVC Pipes

PVC pipes, made from polyvinyl chloride, are commonly used in drainage systems rather than drinking supply lines. These pipes are lightweight, affordable, and easy to install, making them a standard choice for sewer and drain applications.

PVC pipes are particularly valued for their corrosion resistance. Unlike metal pipes, they will not rust over time. They also tend to have smooth interior surfaces that help prevent buildup inside the pipe. However, PVC pipes are not typically used for hot water systems because high temperatures can weaken the material. For that reason, they are most often found in residential drain, waste, and vent systems. Because of their affordability and ease of installation, PVC pipes remain one of the most common types of plumbing pipes used for wastewater systems.

4. CPVC Pipes

CPVC pipes are closely related to PVC pipes but are treated with additional chlorine during manufacturing. This extra processing allows the material to tolerate higher temperatures. Because of this improvement, CPVC can be used for both hot and cold water supply lines. Many homes built during the 1980s-early 2000s used CPVC as a cost-effective alternative to copper piping. Like PVC, CPVC resists corrosion and chemical attack, helping extend the life of the plumbing system. It is also lighter and easier to install than many metal pipe materials.

One drawback is that CPVC can become brittle with age or extreme temperature fluctuations. Over time, it may develop cracks or become more susceptible to damage. Even with these concerns, CPVC remains a practical choice among the different types of plumbing pipes used in residential water systems.

5. Galvanized Steel Pipes

Galvanized steel pipes were once a common feature in homes built before the 1960s. These pipes are coated with a protective zinc layer to prevent rust. When they were first introduced, galvanized pipes were considered extremely strong and reliable. However, over time, the protective zinc layer gradually wears away, allowing corrosion to develop inside the pipe.

As corrosion builds up internally, it can reduce water pressure and restrict flow. In some cases, rust particles may even find their way into household water. Because of these issues, many older homes eventually replace galvanized systems with modern materials like PEX or copper. If your home still has galvanized pipes, it may be worth having a professional inspect them to assess their condition.

6. ABS Pipes

ABS pipes, made from acrylonitrile butadiene styrene, are commonly used in residential drain, waste, and vent systems. These pipes are typically black and known for their durability and impact resistance.

Like PVC, ABS is lightweight and relatively easy to install, which makes it a practical option for many plumbing drainage systems. It also performs well in colder temperatures and can be more resistant to cracking in freezing conditions.

However, ABS pipes are less commonly used for water supply lines and are primarily found in drainage systems. In many newer plumbing installations, homeowners may see either ABS or PVC used for these purposes, depending on local building codes and installer preference.

7. Cast Iron Pipes

Cast iron pipes are most commonly found in the older drainage and sewer systems. These pipes are extremely heavy and were originally favored for their strength and longevity. One of the lesser-known benefits of cast iron is its noise-reducing properties. Because the material is dense, it absorbs sound well, making it quieter when water flows through the system. This is one reason cast iron pipes were often installed in multi-story homes or apartment buildings.

However, cast iron pipes can eventually rust from the inside out. As corrosion develops, the pipe walls may weaken and crack, leading to leaks or blockages. For this reason, many modern plumbing systems have replaced cast iron with PVC or ABS piping. Even though they are less commonly installed today, cast iron remains one of the historically significant types of plumbing used in residential construction.

Two More Materials Worth Knowing About in an Older Utah Home

The seven above cover almost everything you will find in a Utah home. Two others are worth naming because they are the ones that turn a small job into a big one, and because a homeowner who knows the words can ask the right question before buying a house.

Orangeburg (bituminized fiber sewer pipe)

During World War II there was a metal shortage, so sewer pipe got made out of what is basically rolled-up tar paper, layers of wood fiber bonded with asphalt. It went into millions of homes, including plenty built here in the 1940s and 1950s. It does not corrode the way iron does. It deforms. The pipe slowly goes oval under the weight of the soil until it collapses.

The reason it matters more than any other material on this page: if you run a snake down an Orangeburg line, it will tear the pipe up and finish it off. A drain that could have been lined becomes a dig. So on any home from that era, put a camera down before anybody puts a tool down. A sewer camera inspection tells you what you have, and if the pipe is still round enough, pipe lining can often save you the excavation.

Polybutylene

Polybutylene supply pipe went in from the late 1970s through the mid 1990s. It is gray, flexible, and usually marked PB2110. It was cheap and fast to install, and then it started failing, because the chlorine and other disinfectants in treated municipal water attack the material and the old acetal fittings from the inside. The failure mode is the bad one: it does not weep first, it splits.

If your home was built in that window and you find gray flexible supply lines at the water heater or under a sink, that is the pipe to plan around. It is one of the few cases where whole-home repiping is the honest recommendation on material alone rather than on a pressure symptom.

How to Tell the Type of Plumbing Pipe in Your Home

Many homeowners wonder how to tell the type of plumbing pipe they have without opening walls. In many cases, you can identify pipe materials by examining exposed sections of the plumbing system. Basements, crawl spaces, and areas under the sink often reveal visible sections of pipe that can provide clues about the material used.

Copper pipes have a metallic orange or bronze appearance, while PEX pipes are typically red, blue, or white plastic tubing. PVC pipes are generally white or gray, and ABS pipes are black. Galvanized pipes often appear dull gray with threaded connections. Another helpful clue is the age of your home. Older homes built before the 1960s may have galvanized steel or cast-iron piping, homes from the late 1970s through the mid 1990s may have polybutylene supply lines, and homes built in recent decades often use PEX, CPVC, or copper. If you’re still unsure about your plumbing materials, a professional plumber can quickly identify the pipe type and assess its condition.

Get Expert Help from Rare Breed Plumbing, Heating, and Air

Understanding the different types of plumbing pipes in your home can help you make smarter decisions when repairs or upgrades are needed. However, identifying pipe materials is only part of the equation. Knowing when pipes need repair, replacement, or professional maintenance is just as important for protecting your plumbing system. The experienced team at Rare Breed Plumbing, Heating, and Air provides a wide range of plumbing services designed to keep residential plumbing systems working safely and efficiently. Whether you’re dealing with aging pipes, frequent clogs, or planning a renovation, our licensed professionals have the tools and expertise to help.

If your home is experiencing issues with water pressure, leaks, or older plumbing material, professional main water line services can help identify and resolve problems before they lead to costly damage. At Rare Breed Plumbing, Heating, and Air, we also specialize in plumbing remodel services, helping homeowners upgrade outdated systems during kitchen, bathroom, or whole-home renovation projects.

For homeowners dealing with recurring clogs or slow-moving drains, our team offers professional drain cleaning services that remove buildup and restore proper flow throughout the plumbing system. When pipes are damaged, but replacement isn’t ideal, pipe lining services can reinforce existing pipes from the inside, extending their lifespan while minimizing disruption to your home.

Working out of three shops, our main hub in Sandy at 8763 Sandy Pkwy, the Bountiful shop at 270 S Main St Ste 113 where the company got its start, and our Orem shop at 1197 S 1480 W, Rare Breed Plumbing, Heating, and Air serves homeowners throughout Salt Lake, Davis, Utah, Weber, Summit, Tooele, Wasatch, Cache, and Box Elder counties. No matter how big the project, Rare Breed Plumbing, Heating, and Air is ready to help. Contact our team today to schedule service and ensure your home’s plumbing system remains reliable for years to come.

FAQ

What pipe materials show up in a typical home?

The article covers seven common types: copper, PEX, PVC, CPVC, galvanized steel, ABS, and cast iron. Older Utah homes may also have Orangeburg sewer pipe or polybutylene supply lines.

How can I tell what pipe I have?

Look at exposed runs in the basement, crawl space, or under a sink. Copper is orange or bronze. PEX is red, blue, or white. PVC is white or gray. ABS is black. Galvanized is dull gray with threads.

Does the age of the house help?

Homes before the 1960s may have galvanized or cast iron. Late 1970s through mid 1990s may have polybutylene. Newer work is often PEX, CPVC, or copper.

Why does PEX show up in remodels?

It installs faster, costs less than copper in many layouts, and can expand a bit if water inside freezes instead of splitting right away. Keep it out of direct sun.

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