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September 10, 2026

For California employers and insurance professionals, the Statute of Limitations (SOL) represents a critical line of defense. When successfully asserted, it provides complete finality, protecting defendants from liability for claims filed long after the legal window has closed. However, as two recent 2026 panel decisions demonstrate, the SOL defense depends on the defendant’s ability to prove specific “threshold” facts and navigate the complexities of Labor Code sections 5405 and 5412.

This article examines the critical nuances of a Status of Limitations defense through the lens of two recent cases: one involving a specific injury and the procedural duties of the employer, and the other involving a cumulative trauma (CT) claim filed years after retirement and the applicant’s constructive knowledge of that injury.

The primary issue in both of these cases lies in the burden of proof. Under Labor Code section 5409, the Statute of Limitations is an affirmative defense. The burden is entirely on the defendant to prove:

  1. The specific date of injury (per Section 5412).
  2. That the applicant failed to file within one year of that date.

Case #1: Petarra v. Azusa Unified School District (2026)

General Facts and Issues

In Petarra, the applicant, a food service worker, alleged a specific injury to her left ankle occurring on March 10, 2021. However, she did not file an Application for Adjudication until February 24, 2023—nearly two years later.

The defendant asserted the one-year statute of limitations under Labor Code section 5405. The defense argued that because the applicant was aware of the injury and the date of occurrence was certain, her claim was barred. The applicant countered that she had reported the injury immediately and that the defendant failed in its legal duty to provide a DWC-1 Claim Form, which should “estop” (prevent) the defense from asserting the SOL.

The Ruling

The Workers’ Compensation Administrative Law Judge (WCJ) found that the defendant failed to meet its burden of proving the claim was barred. On reconsideration, the WCAB panel affirmed this finding. The Board ruled that the defendant failed to prove it was relieved of the duty to provide a claim form and therefore could not benefit from the SOL defense. This failure to comply with section 5401 tolled the statute of limitations under section 5405 until the applicant learned of her workers’ compensation rights.

Case #2: Lowe v. San Mateo County Transit District (2026)

General Facts and Issues

Lowe involved a cumulative trauma claim for hearing loss filed by a former bus operator. The applicant retired in May 2015 but did not file his claim until January 2020—nearly five years after his last day of work.

The central issue here was determining the “date of injury” under Labor Code section 5412, which for CT cases requires both “disability” and “knowledge of industrial causation.” The defendant argued that the applicant knew his hearing loss was work-related long before he filed, citing his own testimony that he had requested earplugs “early on” in his career. The WCJ found that applicant was not credible with respect to his testimony related to the claim for hearing loss and issued a take nothing.

The Ruling

In a split decision, the WCAB overturned the WCJ’s “take nothing” order. The majority found that the applicant did not possess the “requisite skills or expertise” to self-diagnose industrial causation. The Board ruled the claim was timely because the “date of injury” did not occur until a medical professional (the QME) officially linked the hearing loss to his employment.

Discussion: Proving “Knowledge” and the Employer’s Duty

These two cases highlight the two different ways a Statute of Limitations defense can fail: through procedural oversight (Petarra) and through the high evidentiary bar of proving “knowledge” (Lowe).

The Trap of Labor Code § 5401 and Honeywell

The Petarra decision reinforces the strict requirements of Labor Code section 5401. When an employer has notice of an injury that results in lost time or medical treatment beyond first aid, they must provide a claim form within one working day.

In Petarra, the defense tried to argue the injury was “first aid only,” which would have relieved them of the duty to provide the form. However, the Board relied on Honeywell v. WCAB (Wagner) to clarify that if an employer fails to provide the form when required, they are often estopped from asserting the SOL defense later. For the defense, this means a “specific injury” that seems late is not necessarily an automatic win if the internal paper trail is lacking.

The Burden of Section 5412 in CT Claims

The Lowe decision is particularly challenging for the defense. It confirms that “suspicion” is not “knowledge.” Even though Mr. Lowe knew his ears rang and had asked for protection years prior, the Board held that he was not a medical expert.

This creates a “Knowledge Gap” that applicants frequently exploit. As long as an applicant claims they didn’t definitively know work caused the problem until they saw a lawyer or a doctor, the one-year clock may remain paused for years, or even decades, even after they have already stop working.

Comparing the Cases: Success vs. Failure for the Defense

Case Name Petarra v. Azusa USD Lowe v. San Mateo County Transit
Injury Type Specific Injury (Ankle) Cumulative Trauma (Hearing)
Primary Defense Labor Code § 5405 (1 year) Labor Code § 5412 (Date of Injury)
The “Weak Link” Failure to provide DWC-1 form Lack of medical evidence of “knowledge”

 

The common thread in both of these cases is the affirmative burden of proof. Under Labor Code section 5409, the defendant must prove the SOL applies. In both instances, the WCAB held the defendants to an exacting standard of evidence that was not met.

Defensive Action Items and Warnings

To avoid the outcomes seen in Petarra and Lowe, claims administrators and employers should implement the following “Action Items”:

  1. Immediate Provision of DWC-1: Even if an injury seems minor, if there is any doubt, provide the claim form. Documentation of the provision of this form is the best way to prevent an “estoppel” argument like the one that defeated the defense in Petarra.
    • Aggressive Discovery on “Knowledge”: In CT cases, do not rely on the filing date. Subpoena records from the applicant’s primary care physicians going back several years to look for any instance where the applicant told a doctor their complaints were work-related. This could be the “smoking gun” to establish that a date of injury under Section 5412. Use the subpoenaed records to find the very first date the applicant sought treatment for the body part(s) in question. If that date is more than a year old, then you may have the foundation for a Section 5405 defense.
  2. The “Expertise” Rebuttal: In response to the Lowe decision, the defense must argue that while an applicant isn’t a doctor, “reasonable diligence” (per Section 5412) requires them to investigate their symptoms. If an applicant is seeking treatment for a condition they believe is work-related but waits five years to file, the defense should push for a finding of “constructive knowledge.”

Final Perspective

The Statute of Limitations remains one of the most effective tools for closing files without significant costs or indemnity exposure. However, success depends on aggressive early discovery.

The decisions in Petarra and Lowe are reminders that even a Statute of Limitations has its weaknesses. For the defense, meticulous record-keeping of industrially related injuries and aggressive early-stage discovery are pertinent to a positive outcome in litigation.

If an employer fails to provide the required notices, or if a claims professional fails to dig into the medical history and provide rebuttal testimony regarding the applicant’s knowledge of an injury, even this powerful legal shield can fail.

References:

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