Polybutylene Plumbing Lawsuit: The PB Pipe Settlement Closed in 2009
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If an inspector just flagged gray plastic pipe in a house you own or are buying, here is the short answer. The big polybutylene plumbing class action — Cox v. Shell Oil, a $950 million settlement approved in November 1995 — stopped taking claims on May 1, 2009. The separate DuPont settlement has closed too, as did the Canadian Shell claims period on June 18, 2005. As of October 2026 there is no open PB pipe class action, no claim form and no deadline to meet.
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Reviewed by Leonard Goldberg, Editor · Last updated
What the Polybutylene Lawsuits Claimed
Polybutylene (PB) is a flexible, usually gray plastic pipe installed in homes, mobile homes and apartments from 1978 into the mid-1990s — in up to 6 million housing units, per 1995 reporting. Homeowners claimed the pipes and their plastic (acetal) insert fittings leaked when exposed to chlorine and other chemicals in ordinary tap water.
Shell Oil made the resin for the pipe; Hoechst Celanese and DuPont made materials for the fittings. Every pb pipe lawsuit — and every class action lawsuit polybutylene plumbing owners brought against them — alleged a defective product. The companies denied the pipes were faulty and blamed poor installation and improper use. The defendants denied liability in the U.S. settlements.
Case Details
The main polybutylene plumbing class action lawsuit was Cox, et al. v. Shell Oil Co., et ano. in the Chancery Court for Obion County at Union City, Tennessee. State Judge Mike Maloan approved the $950 million settlement with Shell and Hoechst Celanese in November 1995. The Consumer Plumbing Recovery Center in Plano, Texas, ran the claims.
A second case, Spencer, et al. v. Shell Oil Co., et al. in the Circuit Court of Greene County, Alabama, produced a $120 million settlement with DuPont only, originally reached in 1995. In Canada, Shell settled for $20 million in 2004 (cases including Furlan v. Shell Oil Company, No. C967236, Supreme Court of British Columbia, and Gariepy v. Shell Oil Company, No. 307981/99, Ontario Superior Court of Justice).
Status: Every PB Pipe Settlement Is Closed
As of October 2026 we found no new polybutylene plumbing class action, settlement or claim form in the U.S. Remaining disputes are individual: claims against a seller, a builder or a homeowner’s insurer over a specific leak.
Who Was Covered — and Why It No Longer Matters
Cox covered current and former owners of property with PB plumbing installed between January 1, 1978 and July 31, 1995, plus PB yard service lines. The system needed at least one qualifying leak; first-year warranty leaks, abuse, leaks under sinks that could be fixed without opening a wall, and ice-maker lines did not count. Spencer covered PB pipe with acetal insert fittings only — not copper, brass or black plastic fittings, compression fittings, or blue PB supply pipe.
Today the class definitions are history. Owning a PB house in 2026 does not entitle you to anything from these funds. What matters now is your insurance policy, your purchase contract and your state’s deadlines for a defect or disclosure claim.
What the Settlements Paid — and What Is Left
If your PB pipe leaks now, the realistic money sources are your homeowner’s insurance (water damage is usually covered; replacing the whole system often is not) and, if a seller hid known problems, a disclosure claim under your state’s law. One home-inspection firm wrote in 2009 that fewer than ten percent of PB homes had leaked — gray pipe is a risk factor, not proof of damage.
Polybutylene Plumbing Class Action Timeline
- 1
1978 to Mid-1990s — PB Pipe Goes In
Polybutylene with plastic insert fittings is installed in homes, mobile homes and apartments; the Cox class later covers systems installed from January 1, 1978 to July 31, 1995.
- 2
October 1993 — Settlement Talks Begin
After a decade of leak lawsuits, plaintiffs’ lawyers and the manufacturers begin negotiating a nationwide deal.
- 3
November 1995 — $950 Million Cox Settlement Approved
Judge Mike Maloan in Union City, Tennessee approves the Shell and Hoechst Celanese fund. DuPont’s $120 million Spencer settlement was originally reached in 1995.
- 4
2000 to 2002 — Insurers Lose Class Bids
Insurers suing to recover leak payouts are denied class status in New Jersey federal court in 2000 and in Weakley County, Tennessee in 2002.
- 5
2004 to 2010 — Canadian Settlements
Shell settles in Canada for $20 million, approved in Ontario April 16, 2004; Hoechst Celanese settles there on June 14, 2010.
- 6
May 1, 2009 — Last Cox Claims Deadline
The final Cox filing window closes. As of October 2026 no polybutylene settlement is open anywhere in the U.S.
Three Things to Watch For
A famous $950 million settlement that most people never heard closed is easy to exploit:
“Unclaimed polybutylene settlement money” offers
The Cox and Spencer funds closed years ago. A letter or site offering to recover your “share” for an upfront fee is selling something that does not exist.
Repipe sales pitches citing the lawsuit
Some contractors imply a settlement or rebate will cover a whole-house repipe. Nothing pays for that today; get the quote on its own merits and check your insurance first.
“Join the new PB pipe class action lawsuit” ads
We found no new nationwide polybutylene case as of October 2026. Ads using the old case name to collect your address and phone number are lead generation, not a court notice.
Polybutylene Pipe Lawsuit — Questions People Actually Ask
Is there still a polybutylene plumbing class action I can join?
No. The Cox v. Shell settlement took its last claims on May 1, 2009, the Spencer (DuPont) benefits ended with the 15-year replumb limit, and the Canadian Shell claims deadline was June 18, 2005. As of October 2026 no open PB pipe class action exists.
How much was the polybutylene settlement?
Shell and Hoechst Celanese committed $950 million in Cox, approved in November 1995. DuPont separately committed $120 million in Spencer. In Canada, Shell paid $20 million and DuPont $30 million.
Which court handled the PB pipe lawsuit?
Cox was in the Chancery Court for Obion County in Union City, Tennessee. Spencer was in the Circuit Court of Greene County, Alabama. Both were state courts, not federal.
I just bought a house with polybutylene. Can I still sue?
Not through the old class actions. Individual claims may exist — for example against a seller who hid known leaks — but they depend on your state’s disclosure law and deadlines. A local real-estate attorney can tell you whether one applies.
Will homeowner’s insurance pay to replace polybutylene pipe?
Policies typically cover sudden water damage from a leak, but often not replacing pipe that has not failed. Insurers have litigated this; a federal class action against State Farm in Arizona, Guadiana v. State Farm Fire and Casualty Co. (No. CV 07-326), argued over it, and we could not confirm its final outcome.
How do I know if I have polybutylene pipe?
Look where pipe is exposed — near the water heater, in the attic or basement, at the main shutoff. PB is flexible and usually gray, sometimes black, often joined with gray or white plastic fittings and aluminum or copper crimp rings.
Is this the same as the Uponor PEX lawsuit?
No. PEX is a different plastic. The Uponor PEX lawsuit is a separate case over cracking PEX pipe; nothing from the polybutylene settlements carries over to it.
Did the manufacturers admit the pipe was defective?
No. Shell, Hoechst Celanese and DuPont denied the pipes were faulty and blamed installation and improper use. The U.S. settlements resolved claims without any admission of liability.
Separate from this case: were you injured in the last 2 years?
Class-action payouts are fixed amounts through an administrator. A personal injury claim is a different case — and often worth far more. Free estimate, no obligation.
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Home Insurance Claim Calculator
Estimate a water-damage claim when a PB pipe fails
Uponor PEX Lawsuit
A separate, newer case over plastic plumbing fittings
Open Class Action Settlements
Settlements you can still file a claim in today
Settlement Payout Calculator
How class settlement funds get divided per person