You can usually tell what kind of pipes your house has by looking at their color, how they are joined, and any printed markings. The best places to look are the basement, the utility room, and the area around the water heater and main shut-off valve.
Water Supply Pipes
- Copper: reddish-brown, or green where it has aged. Joints are soldered and look smooth.
- Galvanized steel: dull gray metal with threaded joints. A magnet will stick to it, but not to copper.
- PEX: flexible plastic tubing, often red, blue, or white, held with metal crimp rings.
- CPVC: rigid cream or tan plastic joined with glued fittings.
A simple trick is to scratch the pipe gently with a coin. Copper will show a shiny penny color. Galvanized steel will look silver-gray.
Drain Pipes
Drain pipes are larger than supply lines. Older homes often have heavy black cast iron drains. Newer drains are usually white PVC or black ABS plastic. You may see a mix of materials where parts of the system were updated over the years. Look for rubber couplings where old and new pipes meet.
Why Pipe Type Makes a Difference
Each material ages differently. Galvanized steel can rust inside and lower water pressure. Cast iron can crack or scale. Knowing what you have helps you understand which problems to watch for and what repairs might cost. It also helps when you talk with a plumber, since they can plan the right parts and tools. If you are buying or selling a home, the pipe type may come up during an inspection too.
Pipes inside walls may be different from the ones you can see, especially in homes that were partly remodeled.
If you spot green crust, rust, or damp spots while checking, stopping the leak early can save the surrounding wood and drywall.
For help identifying older pipes, you can ask a plumber to take a look. Call JPR Plumbing at (833) 603-1840.