Uponor PEX Lawsuit: Defects, Case Status, and Homeowner Options

Homeowners across at least ten states have filed federal class action lawsuits against Uponor, Inc. alleging that its AquaPEX plumbing pipes are defectively manufactured and crack or leak within a few years of installation rather than lasting the 50 to 100 years the company advertises. The Uponor PEX lawsuits focus on red, white, and blue pipes produced between roughly 2010 and 2021. No class has been certified yet, no multidistrict litigation has been established, and Uponor denies there is any systemic defect in its product.¹

What the Lawsuits Say Is Wrong With the Pipes

The complaints center on how Uponor makes its PEX-a pipe. The company uses the Engel method, a hot cross-linking technique that requires high heat, and the plaintiffs allege that heat prematurely burns off the antioxidant additives blended into the polyethylene. They also allege the antioxidants are not distributed evenly through the pipe wall, leaving some spots with little protection against oxidation.²

According to the complaints, oxygen then attacks the polyethylene from both the inside and outside surfaces of the pipe. The material grows brittle, microcracks form, and those cracks spread through the wall until water gets out. Two failure patterns are described. In one, cracks appear just outside the reinforcement rings at expansion fittings, where the pipe is most stressed during installation. In the other, long cracks run down the body of the pipe itself, well away from any fitting.²

Red and blue AquaPEX pipes carry an extra allegation. To apply their colored lacquer coatings, those pipes went through a flame treatment during manufacturing. Plaintiffs say that step destroyed antioxidants on the outer surface and left visible defects they describe as “mud cracking,” pitting, and crazing. Uponor discontinued its red and blue pipes in 2021 and replaced them with a white pipe that uses colored printing to mark hot and cold lines.³⁴

The complaints are direct on causation. They assert that faulty installation, high water pressure, and elevated water temperatures do not explain the failure pattern, and that even a properly installed system will eventually degrade because the defect is built into the pipe.⁵

Which Pipes and Homes the Cases Cover

The proposed class in the lead California case covers owners of single-family residential property containing Uponor red, white, or blue PEX piping manufactured from 2010 to 2021 and installed from 2010 to the present. The pipe was used in potable water distribution, hot water recirculation, fire protection, and radiant floor heating systems.³

An investigation by Atlanta News First identified affected homes in at least two different metro Atlanta neighborhoods built by different developers, all plumbed with Uponor PEX, and described complaints as widespread across multiple states.¹

How Fast Failures Are Happening

Uponor markets the pipe as lasting 50 to 100 years. The lawsuits allege failures within three to ten years of installation, and describe a pattern where one leak is followed by more leaks elsewhere in the same house, because the defect runs through the material rather than sitting at one weak point.²

Named plaintiffs in the California complaint reported first leaks between roughly four and thirteen years after they bought their homes. In a separate example, a California homeowner paid $9,000 in 2015 to replace copper piping with Uponor PEX and then had three separate leaks starting in October 2022. Uponor denied the warranty claim, attributing the failure to water pressure. The lawsuit disputes that, noting the home’s pressure ran below 80 PSI.³

Homeowners quoted in news reports describe cycles of recurring leaks and flooding, with damage to drywall, insulation, and flooring. Some have chosen to pull out their entire PEX systems and replumb in copper.¹

Where the Cases Stand

California: Binkley v. Uponor

The lead case, Larry Binkley, et al. v. Uponor, Inc., et al. (Case No. 3:25-cv-07080 EMC), was filed August 25, 2025 in the U.S. District Court for the Northern District of California. An amended complaint was filed May 12, 2026. The plaintiffs are represented by a coalition that includes Birka-White Law Offices, Sauder Schelkopf, and Girard Sharp.⁵

On March 19, 2026, Judge Edward M. Chen denied Uponor’s motion to compel arbitration. Uponor had argued that an online product warranty containing arbitration language bound homeowners. The court held that the company failed to prove homeowners had ever agreed to arbitrate, and that warranty language does not create a standalone arbitration contract. The judge also granted in part and denied in part Uponor’s motion to dismiss. A similar arbitration challenge had already failed in the Middle District of Tennessee.⁶

Minnesota: Fitzpatrick v. Uponor

A second major case, John and Diane Fitzpatrick and John McKenzie v. Uponor, Inc. (Case No. 0:25-cv-04268 SRN-ECW), was filed November 7, 2025 in the District of Minnesota, where Uponor is headquartered. Uponor filed a motion to compel arbitration in January 2026, with a hearing reset to June 17, 2026.⁷

The Minnesota court is moving toward becoming a coordination hub. In March 2026, Judge Susan Richard Nelson consolidated Fitzpatrick with a related case (No. 26-cv-1140), and a magistrate judge ordered the parties to address whether five additional class actions filed in other districts should be transferred to Minnesota under the federal venue-transfer statute.⁷

Other Filings

Additional federal lawsuits have been filed elsewhere, including a February 2026 complaint naming plaintiffs Lindsey Harmon, Maribeth Borroughs, and Seunghun Kim, represented by Berger Montague.⁸ Homeowners and business owners in at least ten states have brought federal claims making essentially the same defect allegations.

An earlier, separate case in Colorado, Matzdorf et al. v. Uponor, Inc. et al. (Case No. 1:21-cv-02057), was filed in July 2021 on behalf of Colorado homeowners with red and blue Uponor PEX. It alleged the same flame-treatment defect theory. Senior U.S. District Judge Raymond P. Moore closed the case on October 15, 2024 following a private settlement whose terms were not disclosed. The named plaintiffs’ claims were dismissed with prejudice; claims of other potentially affected property owners were dismissed without prejudice, so those individuals kept the right to bring future claims.⁹

What Uponor Says

Uponor has consistently denied the allegations. In a statement to Atlanta News First, the company said its PEX piping has “a very low in-field failure rate across billions of feet installed worldwide” and is made under “strict quality controls,” and that “multiple independent experts have concluded there is no systemic issue with our PEX pipe.”¹

The company has also stated that “allegations in complaints do not equate to findings of liability or defect,” noted that earlier lawsuits “have resulted in dismissals,” and argued that PEX performance depends on operating conditions, environmental factors, and non-Uponor system components, so failure investigations should be assessed case by case.¹

Uponor offers a 25-year warranty when pipes are installed correctly and directs affected homeowners to its warranty claim process. Homeowners quoted in news reports say company inspectors have denied claims by attributing failures to high water pressure or temperature. The California complaint says the named plaintiffs never received an express warranty from Uponor and had no knowledge of one.²

What Affected Homeowners Can Do Now

The cases are still in their early phases. No class has been certified in any of them, which means there is no formal process yet for homeowners to join. If a case reaches certification or settlement, individuals who fall within the class definition would typically be notified directly with instructions on how to participate.²

Several of the plaintiffs’ firms have posted online forms where homeowners can report problems and receive updates. The complaints allege Uponor is aware of thousands of reported failures across millions of feet of pipe sold during the relevant years.²

There has been no Consumer Product Safety Commission recall of Uponor PEX products, and no government agency has issued a public statement about the alleged defects.³

1
Atlanta News First. Homeowners Say Defective Pipes Are Wrecking Their Homes
2
Sauder Schelkopf. Uponor Class Action Complaint
3
ClassAction.org. Uponor PEX Lawsuit Alleges Defective AquaPEX Pipes Can Crack, Leak
4
Uponor. Uponor PEX
5
Birka-White Law Offices. Uponor, Inc.
6
Hoodline. Leaky Pipe Showdown: San Francisco Judge Lets Homeowners Take PEX Fight Public
7
Justia Dockets. In Re: Uponor PEX Pipes Product Liability Litigation
8
Plastics News. Uponor PEX Pipe Lawsuits
9
ClassAction.org. Discontinued Red, Blue Uponor PEX Piping Plagued by Cracking Defect, Class Action Alleges