In Re: Methyl Tertiary Butyl Ether Products Liability Litigation

Background

This action is part of a multidistrict litigation concerning groundwater contamination caused by releases of gasoline containing methyl tertiary butyl ether, or MTBE. The Commonwealth of Pennsylvania’s remaining claim is negligence. It alleges that numerous gasoline manufacturers, distributors, and sellers are responsible for actual or threatened MTBE contamination in Pennsylvania drinking water.

The parties identified 75 Focus Sites for discovery and the first trial from more than 5,000 contaminated sites. Certain refiner and local-terminal defendants moved for partial summary judgment, arguing that the Commonwealth lacked evidence connecting them to particular Focus Sites. The Commonwealth did not oppose the motion for approximately 41 sites. It opposed the motion for 28 sites, relying either on a theory involving commingled gasoline or on specific documents it said connected defendants to the contamination.

Legal standard

The court applied the summary-judgment standard under Federal Rule of Civil Procedure 56. Summary judgment is appropriate when the evidence shows no genuine dispute about a fact that could affect the case and the moving party is entitled to judgment under the law. The court does not decide disputed facts at this stage; it asks whether a reasonable jury could find for the nonmoving party.

Under Pennsylvania negligence law, the plaintiff must prove a legally recognized duty, a breach, and a causal connection between the breach and the plaintiff’s damages. In this products-liability setting, the Commonwealth also had to show that the contamination was caused by the product of a particular manufacturer or supplier.

Commingled-product theory

For 18 Focus Sites, the Commonwealth had no evidence linking a named defendant to an MTBE release at the site. It argued that gasoline from multiple suppliers was commingled in Pennsylvania’s distribution system, so it should only have to show that a defendant stored or sold MTBE-containing gasoline at a terminal within about 100 miles of a Focus Site, or somewhere in Pennsylvania generally.

The court rejected that theory. It explained that the commingled-product theory can help prove causation when products from multiple suppliers were shown to be completely commingled at the time and place of the injury. It does not eliminate the need to show that a defendant’s product reached the relevant contaminated site. A terminal where gasoline was commingled was not necessarily the place where the contamination occurred.

The court also rejected the Commonwealth’s argument that the passage of time and missing records made the usual proof effectively impossible. According to the court, it may be impossible to identify which particular molecules caused a release when multiple products were present, but it was not impossible to gather evidence about which defendants supplied gasoline to a particular site. The Commonwealth therefore still had to produce evidence connecting the moving defendants’ gasoline to the Focus Sites.

Evidence concerning individual Focus Sites

The Commonwealth relied on documents concerning 10 additional Focus Sites. The court concluded that the evidence was insufficient for nine of them. For Focus Sites 3, 17, and 35, spreadsheets showed sales or deliveries involving certain defendants but did not show that the gasoline contained MTBE. At Focus Site 35, some of the cited deliveries also occurred after the period when the Commonwealth’s expert identified MTBE releases.

For Focus Site 45, records referring to “Texaco” did not connect the moving defendants to the deliveries because the relevant transactions occurred after the defendants had stopped marketing or distributing gasoline in Pennsylvania. At Focus Site 47, the cited transaction was dated after the latest year in which the Commonwealth’s expert identified a possible release. At Focus Site 18, the evidence referred to a different location.

At Focus Sites 11 and 23, the evidence showed corporate ownership or trademark relationships, but the court found those relationships insufficient by themselves to establish that the moving defendants caused the contamination. At Focus Site 57, the evidence likewise did not show that the moving defendants supplied MTBE-containing gasoline to the site during the relevant period. The court found that these documents would require a jury to speculate rather than establish a genuine factual dispute.

Focus Site 69 and disposition

Focus Site 69 included a refinery owned and operated by United. The moving Sunoco defendants admitted that Sunoco, Inc. (R&M) stored MTBE at the site. The court held that this admission supplied enough evidence of a connection to the site for purposes of this motion. The defendants did not argue that the timing or type of stored product made it incapable of causing the contamination.

The court emphasized that the motion did not address whether the stored MTBE actually entered the releases. The defendants may make that argument at trial, but the court found that their motion did not identify a lack of evidence on that remaining causal link.

Ruling

Judge Denise Cote concluded that the moving defendants’ May 2, 2025 motion for partial summary judgment was granted in part and denied as to Focus Site 69. The opinion’s conclusion describes Focus Site 69 as the single exception to the grant of the motion.