Polybutylene systems were used for underground water mains and as interior water distribution piping. Industry experts believe it was installed in at least 6 million homes, and some experts indicate it may have been used in as many as 10 million homes. Most probably, the piping was installed in about one in every four or five homes built during the years in which the pipe was manufactured.

How to Tell If You Have Poly
Exterior - Polybutylene underground water mains are usually blue, but may be gray or black (do not confuse black poly with polyethelene pipe). It is usually 3/4" or 1" in diameter, and it may be found entering your home through the basement wall or floor, concrete slab or coming up through your crawlspace; often it enters your home near the water heater. Your main shutoff valve is attached to the end of the water main. Also, you should check at the water meter that is located at the street, near the city water main. It is wise to check at both ends of the pipe because we have found cases where copper pipe enters the home, and poly pipe is at the water meter. Obviously, both pipes were used and connected somewhere underground.

Interior - Polybutylene used inside your home can be found near the water heater, running across the ceiling in unfinished basements, and coming out of the walls to feed sinks and toilets. Warning: In some regions of the country plumbers used copper "stub outs" where the pipe exits a wall to feed a fixture, so seeing copper here does not mean that you do not have poly.

Will the Pipes Fail?
While scientific evidence is scarce, it is believed that oxidants in the public water supplies, such as chlorine, react with the polybutylene piping and acetal fittings causing them to scale and flake and become brittle. Micro-fractures result, and the basic structural integrity of the system is reduced. Thus, the system becomes weak and may fail without warning causing damage to the building structure and personal property. It is believed that other factors may also contribute to the failure of polybutylene systems, such as improper installation, but it is virtually impossible to detect installation problems throughout an entire system.

Throughout the 1980's lawsuits were filed complaining of allegedly defective manufacturing and defective installation causing hundreds of millions of dollars in damages. Although the manufacturers have never admitted that poly is defective, they have agreed to fund the Class Action settlement with an initial and minimum amount of $950 million. You'll have to contact the appropriate settlement claim company to find out if you qualify under this settlement.

With regard to elastomers, the study showed that with few exceptions, solutions of chloramines (either monochloramine or dichloramine) produced greater material swelling, deeper and more dense surface cracking, a more rapid loss of elasticity, and greater loss of tensile strength than equivalent concentrations of free chlorine."
----Steven Reiber, HDR Engineering, American Water Works Association Research Foundation----

• Polybutylene pipe is grey, black or blue. Interior polybutylene plumbing is almost always grey and exterior polybutylene plumbing is mostly blue.
• Polybutylene pipe was installed and manufactured from the late 1970's till the mid-1990's, however, stockpiles of polybutylene pipe at supply vendors, such as supply risers were still known to be available up to 1999.
• The most common sizes for polybutylene pipe are 3/8", ½", ¾" and 1".
• Polybutylene piping was used for both residential and commercial water distribution piping.
• Polybutylene pipe connectors can be copper, brass, or plastic. The connector types are barbed with a crimp ring or compression with a plastic or metal ferrule.
  

What are the details of the Polybutylene Lawsuit and resulting Polybutylene Class Action Settlement?
The polybutylene class action lawsuit applied to houses with polybutylene pipe installed between 1978 and 1995. The following pages are excerpts from the Consumer Protection Recovery Center that was formed to disperse funds for elgible homeowners and businesses. There are strict guidelines for reimbursement and the following pages should be read carefully to determine whether or not to spend time filing a claim.