Pipeline Safety Act Citizen Suits: The 60‑Day Notice-and-Delay Requirement Is a Mandatory Condition Precedent Requiring Dismissal

1. Introduction

Sunoco Pipeline LP v. Daniel La Hart (3d Cir. Aug. 18, 2026) arose from a January 31, 2025 leak in Sunoco’s Twin Oaks Pipeline in Upper Makefield Township, Pennsylvania, which allegedly contaminated groundwater, soil, and air. Local residents—led by Daniel and Katherine La Hart and other named plaintiffs—filed (and replicated across multiple filings) state-court actions seeking injunctive relief compelling Sunoco to undertake specified remedial measures.

Sunoco responded by filing a new federal action seeking emergency relief (a temporary restraining order and preliminary injunction), contending that the residents’ state-court injunction efforts amounted to impermissible state “regulation” of an interstate pipeline prohibited by the Pipeline Safety Act (“PSA”). The central issue on appeal, however, was not the merits of preemption, but whether Sunoco could bring this PSA-based federal action at all without first satisfying the PSA’s pre-suit notice-and-delay requirement in 49 U.S.C. § 60121(a)(1)(A).

The Third Circuit (in a nonprecedential disposition) vacated the district court’s order denying emergency relief and remanded with instructions to dismiss the case without prejudice, holding that Sunoco failed to comply with the PSA’s mandatory 60-day notice-and-delay requirement before commencing suit.

2. Summary of the Opinion

The court held that 49 U.S.C. § 60121(a)(1)(A) imposes a mandatory condition precedent: a person “may bring the action only after 60 days after” giving notice of the violation to the Secretary of Transportation (or appropriate state authority) and to the alleged violator. Sunoco sent a notice letter to the Department of Transportation on July 18, 2025, and filed its federal complaint the same day. Because Sunoco did not wait 60 days (and did not dispute the timing defect), its action was barred and had to be dismissed.

Relying chiefly on Hallstrom v. Tillamook County, 493 U.S. 20 (1989), the court rejected Sunoco’s request for a “flexible” construction or an equitable exception. The court vacated the order denying preliminary relief and remanded with instructions to dismiss the case without prejudice.

3. Analysis

A. Precedents Cited

• Hallstrom v. Tillamook County, 493 U.S. 20 (1989)
  

  This was the opinion’s controlling authority. Hallstrom construed the Resource Conservation and Recovery Act’s similar citizen-suit provision requiring 60 days’ notice and delay before filing. The Supreme Court held that the notice and delay requirements are “mandatory conditions precedent to commencing suit” that courts “may not disregard … at [their] discretion.” The Third Circuit imported Hallstrom’s reasoning directly: statutory text requiring a 60-day waiting period cannot be “flexibly” reinterpreted to permit immediate filing, even where a plaintiff claims urgency.

  The Third Circuit also invoked Hallstrom for a separation-of-powers point: courts are “not at liberty to create an exception where Congress has declined to do so.” That principle foreclosed Sunoco’s attempt to obtain equitable dispensation from the statutory waiting period.

• Laclede Gas. Co. v. St. Charles County, 713 F.3d 413 (8th Cir. 2013)
  

  The court cited Laclede Gas as persuasive confirmation that other circuits treat the PSA’s notice-and-delay rule as strict: “a PSA action cannot be filed until 60 days after proper notice is given.” This citation supported the Third Circuit’s rejection of Sunoco’s argument that no court had treated the PSA requirement as inflexible.

• SFPP, L.P. v. Union Pac. R.R. Co., 274 F. App’x 549 (9th Cir. 2008)
  

  Similarly, the court cited SFPP for the proposition that PSA-related claims fail where the plaintiff did not provide the requisite notice “60 days before filing.” The Third Circuit used this to reinforce that the strict approach is not novel and aligns with the broader citizen-suit jurisprudence derived from Hallstrom.

• Smith v. City of Atlantic City, 138 F.4th 759 (3d Cir. 2025)
  

  Cited for the standard of review: denials of preliminary injunctions are reviewed for abuse of discretion. Notably, the panel did not reach the injunction merits; the case was resolved at the threshold statutory-compliance level.

The opinion also noted Hallstrom’s observation that these notice provisions were modeled on the Clean Air Act’s citizen-suit notice rule (cited in the opinion as 42 U.S.C. § 7604), underscoring a common legislative design: advance notice and a waiting period to facilitate agency involvement and voluntary compliance before litigation.

B. Legal Reasoning

1. Textual trigger: “only after 60 days after” notice.
   

   The court treated the statutory text as dispositive. Section 60121(a)(1)(A) does not merely require notice; it requires a temporal buffer—suit may be brought “only after 60 days after” notice is given. Filing on the same day as the notice letter necessarily violates the command.

2. Hallstrom’s framework controls PSA citizen-suit timing.
   

   The panel applied Hallstrom’s holding to the PSA: where Congress conditions the right to sue on advance notice and delay, courts must enforce those prerequisites as written. The court rejected Sunoco’s characterization of Hallstrom as allowing “flexible construction,” noting that Hallstrom explicitly rejected “flexible or pragmatic” approaches as contradicting statutory language.

3. No equitable exception—urgency does not rewrite prerequisites.
   

   Sunoco sought an equitable exception given the emergency nature of pipeline leak litigation and the claimed need to stop state-court injunction efforts immediately. The panel held that such equitable tailoring is unavailable when Congress created no exception. The court’s reasoning reflects a structural point: if strict enforcement produces harsh results in urgent situations, that is for Congress to address by adding emergency carve-outs, not for courts to imply them.

4. Procedural consequence: dismissal without prejudice.
   

   Following Hallstrom’s “general rule” that statutorily barred actions “must be dismissed,” the court ordered dismissal without prejudice—preserving the possibility of refiling once the notice-and-wait period is satisfied.

C. Impact

Although designated “Not Precedential,” the decision is a clear signal of how the Third Circuit is likely to treat PSA citizen-suit timing arguments in future disputes:

• Strict compliance is required even in fast-moving emergency contexts. Parties seeking immediate federal injunctive relief under the PSA’s citizen-suit provision must plan around the 60-day delay. Filing first and litigating notice later is not an option.
• Strategic implications for pipeline operators and regulated entities. Sunoco—a regulated operator—used the PSA citizen-suit mechanism offensively to enjoin private litigants’ state-court requests. The decision warns that even when a party frames a claim as stopping unlawful “regulation” of interstate pipelines, the statutory pre-suit gatekeeping applies with full force if § 60121 is the vehicle.
• Forum and remedy selection will matter. Litigants may increasingly explore alternative procedural routes (e.g., administrative engagement, state-court defenses, or other federal causes of action where available) when immediate relief is sought—because § 60121’s built-in delay may be incompatible with emergency litigation needs.
• Encourages agency involvement. The notice-and-delay structure is designed to give the Department of Transportation (or state authorities) an opportunity to address safety issues before private litigation escalates—an objective reinforced by this decision’s refusal to shorten the window.

4. Complex Concepts Simplified

PSA “citizen suit” (49 U.S.C. § 60121)

A statutory authorization allowing “a person” to sue for an injunction to address violations of the PSA or related regulations/orders, but only if the person first gives notice and waits 60 days.

60-day notice-and-delay requirement

Two linked prerequisites: (1) send notice of the alleged violation to specified recipients (the Secretary of Transportation or appropriate state authority, and the alleged violator), and (2) wait at least 60 days before filing suit.

Condition precedent

A step that must occur before a lawsuit can be legally initiated. If it is not satisfied, the court must dismiss the case regardless of the underlying merits.

Equitable exception

A judge-made carve-out based on fairness (e.g., emergencies). The court held it could not create one here because Congress did not include it in the statute.

Dismissal without prejudice

The case is dismissed, but the plaintiff may file again later (here, potentially after properly giving notice and waiting 60 days).

Nonprecedential disposition

The panel’s decision does not bind future Third Circuit panels under the court’s internal operating procedures, though it may still be cited for persuasive value depending on applicable rules.

5. Conclusion

The Third Circuit’s decision establishes (at least as a strongly persuasive, nonprecedential application) a straightforward rule for PSA litigation: the 60-day notice-and-delay requirement in 49 U.S.C. § 60121(a)(1)(A) is a mandatory condition precedent, and failure to comply requires dismissal. By anchoring its reasoning in Hallstrom v. Tillamook County and aligned circuit authority, the court declined to adopt flexible construction or equitable exceptions—even where emergency relief was sought. The key takeaway for future litigants is practical and immediate: when invoking the PSA citizen-suit mechanism, timing is jurisdictionally fatal in effect, and statutory prerequisites must be satisfied before the courthouse door opens.