The most effective way of identifying polybutylene pipe (waterline) is to have your plumbing inspected by a licensed professional. While inspectors generally cannot determine if there is deterioration in poly piping, licensed plumbers can confirm if you have poly piping installed in your home. Typical characteristics of polybutylene piping include:
- Blue, gray, or black color
- ½” to 1″ diameter
Poly piping can be used anywhere in the home’s plumbing system – usually its presence can be ascertained by checking the attachments under household sinks, near hot water heaters, or leading into toilets. Following is a list of common places you may inspect for the presence of poly piping:
Interior
- Entering the water heater
- Crossing basement ceilings
- Feeding sinks, toilets, and bathtubs
Exterior
- Entering the home through basement walls, etc.
- Attached to your home’s main water shutoff valve
- Attached to your home’s water meter (often a copper pipe at a water meter will be attached to poly pipe somewhere underground, so it is wise to check both ends of the pipe)
Note: Not all polybutylene piping systems use polybutylene fittings; some use copper. Therefore, if you see copper fittings on a pipe, it does not indicate that you do not have poly piping.
Another important area where poly piping may have been installed is the incoming water supply line to you house. If this incoming pipe is a light blue plastic pipe, it is likely that you have a type of poly pipe informally called “Big Blue”. This pipe is extremely prone to failure and unexpected bursting. If you have this type of pipe as an incoming water supply line, it is recommended that you have it replaced as soon as possible.