The Nation’s Insurance Laboratory: What Liability Trends in California Mean for the Rest of the Country

For claims executives and insurance company leaders, one jurisdiction consistently demands disproportionate attention: California.

The Golden State has long functioned as the nation’s bellwether for the liability trends, regulatory frameworks and legal doctrines that eventually ripple across the rest of the country. Understanding why California occupies this role, what signals it is currently sending, and which other states have emerged as trendsetters in their own right is essential for staying ahead of loss cost development and rate adequacy challenges.

Why California Leads

California is the largest insurance market in the United States, with nearly 40 million residents and an economy that would rank among the world’s top five nations. When liability trends shift here, they affect national and global carrier portfolios immediately.

The state has been a proving ground for expansive liability doctrines for more than 60 years. Its courts have consistently originated legal theories that reshape the property/casualty landscape nationwide.

For example, the California Supreme Court’s landmark Greenman v. Yuba Power Products decision (1963) established strict products liability in tort — a doctrine that spread to courts across the country and was formalized in the Restatement (Second) of Torts. California also pioneered MICRA (the Medical Injury Compensation Reform Act) in 1975, imposing a cap on noneconomic damages in medical malpractice — a reform more than half of U.S. states eventually adopted in some form.

More recently, the state’s courts and legislature have been at the forefront of expanding theories of recovery in areas ranging from consumer protection to premises liability, and California consistently ranks among the most frequent venues for nuclear verdicts — jury awards of $10 million or more.

Beyond the courtroom, California’s regulatory environment has profoundly shaped insurer behavior.

Related: California Commissioner Advances Proposal to Overhaul Intervenor Process

In California, Proposition 103 set forth a prior-approval rate system that some would argue contributed to the artificial suppression of rates, prolonged approval timelines, and constraints on market innovation — conditions that arguably led to presented day market instability and insurance availability issues. For instance, until recently, the prior approval regime did not consider forward-looking catastrophe models for wildfire risk, forcing reliance on historical loss data alone. The consequences have been significant: beginning in 2022, many major national and specialty carriers have stopped or curtailed writing new business in the state since at least 2022. No surprise, the FAIR Plan, the state’s residual market insurer, has seen its policy count surge in recent years.

California’s wildfire-driven market dislocation is not a localized phenomenon. Insurer nonrenewal rates have surged nationally, and the pattern of carrier withdrawal, residual market overload, and regulatory crisis seen in California is emerging in other catastrophe-exposed states. For claims executives, California’s experience today foreshadows challenges the broader industry will confront as climate patterns shift, wildland-urban interface development expands, and aging infrastructure increases vulnerability.

How California Drives National Loss and Rate Trends

Social inflation — claims costs outpacing general economic inflation due to litigation trends, shifting jury attitudes and third-party litigation funding — has hit P/C insurers hardest in plaintiff-friendly states, with California consistently among the most affected.

Swiss Re Institute research has identified social inflation as a significant factor pushing U.S. liability claims costs well above the pace of general price increases over the past decade. The incidence and size of outsized jury awards have also escalated sharply. An ILR analysis of 1,288 verdicts of $10 million or more between 2013 and 2022 found that four states — California, Florida, New York, and Texas — accounted for roughly half of all such awards, despite representing only about one-third of the U.S. population. Separately, a joint Insurance Information Institute and Casualty Actuarial Society study estimated that increasing inflation — both economic and litigation-driven — added between $42.7 billion and $55.8 billion in excess losses to the commercial auto liability line alone over a recent 10-year period.

Critically, what begins in California frequently migrates. Plaintiff strategies tested and refined in California courts — including the so-called “reptile theory” that frames defendants as threats to community safety, aggressive use of third-party litigation funding, and anchoring techniques for noneconomic damages — have proliferated to jurisdictions nationwide.

While details remain murky, litigation funding has reportedly grown into a multi-billion-dollar global industry by the early 2020s, with the majority deployed in the United States. California’s regulatory experiments similarly spread: the California Consumer Privacy Act (CCPA), enacted in 2018, prompted at least 20 states to follow with their own data privacy laws, according to Bloomberg Law’s state privacy legislation tracker. Even when California’s regulatory choices prove problematic — as Prop 103’s rate suppression has — they frame the policy debates that other states undertake about the proper balance between consumer protection and market stability.

What This Means for Claims Executives

California (as well as other notable states, such as Florida, New York, and Texas) collectively produce a disproportionate share of the nation’s nuclear verdicts, making jurisdictional risk scoring for these states a foundational element of any underwriting and reserving strategy. But the key insight is that reform is cyclical, not permanent. Claims organizations should invest in county-level jurisdictional analytics, track tort reform developments across key states, prepare for regulatory contagion as other states look to replicate or avoid California’s regulatory choices, and engage proactively on litigation funding transparency.

California’s role as the nation’s insurance laboratory is the product of its size, legal culture, regulatory ambition and catastrophe exposure converging in ways that stress-test every assumption insurers hold about loss costs and market viability. But it does not act alone. Florida has shaped property insurance litigation trends. Texas and Georgia have demonstrated how quickly nuclear verdict culture can metastasize — and how rapidly reform can respond.

For claims executives, the imperative is clear: what happens in California and these other trendsetting jurisdictions today will define your loss ratios, reserve adequacy, and strategic positioning tomorrow.

Kook is a partner in charge of Los Angeles at Hinshaw & Culbertson LLC. He is an experienced insurance regulatory and litigation attorney, who advises carriers, producers, and other regulated entities on rating and regulatory compliance, including licensing, underwriting and forms.