A decade after the 2015–2016 Aliso Canyon gas blowout, described as the largest methane leak in U.S. history, UCLA and NYU researchers report that residents of Porter Ranch and nearby communities are still experiencing lasting mental health effects. Drawing on six focus groups with people who lived within five miles of the wellhead, residents described ongoing emotional distress (e.g. anxiety, depression, PTSD symptoms, etc.) along with a deep sense of abandonment and lost trust in institutions.
Published Nov. 12, 2025 in Social Science & Medicine, the study introduces a new way to understand these long-term impacts: a “Disaster Invisibility Framework.” Lead author Katie Lynch said the blowout unfolded without the recognition and support that more visibly dramatic disasters often receive, leaving residents to carry hidden, compounding burdens long after the event. UCLA’s Center for Healthy Climate Solutions (C-Solutions) Dr. David Eisenman, a coauthor on the article, noted that resident perspectives have directly informed the project’s broader work, including its Resident Health Survey and clinical assessments.
Researchers identified four “invisible” dimensions shaping mental health outcomes: invisible risks (confusing, delayed official communication that forced residents to judge danger themselves), invisible harms (persistent health anxiety driven by uncertainty about exposure and future illness), invisible community (anger over perceived lack of accountability and feeling unseen by institutions and media), and invisible changes (altered life plans, reduced sense of safety, and an ongoing desire by some to relocate).
The authors argue that disaster recovery systems need to better address these unseen but real psychological and social consequences through expanded mental health services, transparent communication, and long-term monitoring.
Click here to access the UCLA article.
