United Policyholders Amicus Briefs: California Cases

Montrose Chemical Corp. v. Superior Court (2025)

California Supreme Court

Issue:Whether extrinsic evidence can be used to interpret the pollution exclusion in a liability policy. UP argued that exclusions must be interpreted narrowly and that extrinsic evidence showing the parties' intent should be admissible when policy language is ambiguous.

Why it matters: The pollution exclusion is one of the most over-applied exclusions in property insurance. A ruling allowing extrinsic evidence prevents insurers from using an exclusion originally intended for industrial dumping to deny claims for common household conditions.

Gharibian v. Wawanesa General Insurance Co. (2025)

California Court of Appeal

Issue:The definition of “physical loss or damage” in a property policy. UP argued for a broad interpretation that does not require structural destruction — loss of use or functionality should qualify.

Why it matters:If “physical loss” requires visible structural damage, insurers can deny claims for contamination, smoke odor, toxic exposure, and other conditions that render property unusable without breaking it. A broad interpretation protects policyholders whose homes are uninhabitable even without visible destruction.

Nargizyan v. State Farm General Insurance Co. (2025)

California Court of Appeal

Issue: Application of the seepage/leakage exclusion to water damage claims. UP argued that the exclusion should not apply when the water intrusion was sudden or resulted from a covered peril, not gradual seepage.

Why it matters: Insurers routinely apply the seepage exclusion to deny water damage claims that involve plumbing failures, appliance malfunctions, or sudden pipe bursts. A ruling limiting the exclusion to truly gradual deterioration protects the most common type of homeowners claim.

The Inns By The Sea v. California Mutual Insurance Co. (2021)

California Court of Appeal

Issue:Whether government closure orders during COVID-19 constituted “physical loss or damage” triggering business interruption coverage. UP argued that loss of use constitutes physical loss.

Outcome:The court ruled against the policyholder, holding that physical loss requires actual physical alteration. This is one of many COVID business interruption cases where courts sided with insurers. However, UP's arguments about loss of use remain relevant for non-COVID property claims.

DeBruyn v. Superior Court (2007)

California Court of Appeal

Issue: Application of the efficient proximate cause doctrine. UP argued that when a covered peril (fire, wind) and an excluded peril (earth movement) combine to cause a loss, and the covered peril is the predominant cause, the loss should be covered.

Why it matters:The efficient proximate cause doctrine is one of California's most important policyholder protections. It prevents insurers from denying entire claims by pointing to one excluded contributing factor when the primary cause was a covered peril. This is especially relevant in wildfire, landslide, and multi-peril disaster claims.

Association of California Insurance Companies v. Dave Jones (Commissioner)

California Superior Court

Issue: Whether the Insurance Commissioner could require insurers to provide policyholders with replacement cost estimates at the time of policy sale or renewal. The insurance industry challenged the regulation; UP defended it.

Why it matters:Underinsurance is one of the biggest problems facing homeowners. If insurers must provide replacement cost estimates, policyholders can make informed coverage decisions. Without this requirement, policyholders discover they are underinsured only after a total loss — when it is too late.

Chateau Chamberay Homeowners Association v. Associated International Insurance Co. (2000)

California Court of Appeal

Issue:What constitutes a “genuine dispute” defense to bad faith. UP argued that an insurer cannot hide behind the genuine dispute doctrine when its investigation was biased or inadequate.

Why it matters:The genuine dispute doctrine allows insurers to avoid bad faith liability if their coverage position was “reasonable.” Without limits, insurers could conduct sham investigations to manufacture a “reasonable” basis for denial. This case helps establish that the investigation itself must be fair and thorough.

Baugh Construction Oregon v. Granite State Insurance Co. (1996)

California Court of Appeal

Issue: Bad faith claims handling in a construction defect context. UP briefed the case to support broader recognition of policyholder rights when insurers unreasonably delay or deny construction-related claims.

Why it matters: Construction defect claims often involve massive costs and complex coverage questions. Establishing bad faith standards in this context prevents insurers from using complexity as an excuse for unreasonable delays.

Anderson v. Allstate Insurance Co. (2000)

California Court of Appeal

Issue: Bad faith handling of a mold claim. UP argued that the insurer acted in bad faith by using delay tactics and inadequate investigation to avoid paying for mold remediation.

Why it matters: Mold claims are among the most frequently disputed and underpaid claim types. This case addresses insurer behavior when confronting a loss type they would prefer not to cover at all.

Myasnyankin v. Nationwide Insurance (2023)

California Court of Appeal

Issue:Claims handling standards and the insurer's duty to investigate fairly. UP briefed the court on the regulatory framework governing claims handling in California and why departures from those standards constitute bad faith.

Why it matters:Reinforces that the California Fair Claims Settlement Practices Regulations are not merely aspirational — violations can constitute evidence of bad faith in a civil lawsuit.

Cassim v. Allstate Insurance Co. (2003)

California Court of Appeal

Issue:Recovery of attorney's fees in a bad faith action. UP argued that policyholders who prevail in coverage disputes should be able to recover the fees they spent fighting the insurer.

Why it matters:Without fee recovery, the cost of litigation often exceeds the disputed amount — which is exactly why insurers underpay in the first place. Fee-shifting provisions level the playing field.

California FAIR Plan Association v. Ricardo Lara (Insurance Commissioner) (2022)

California Superior Court

Issue:The scope of the Insurance Commissioner's regulatory authority over the California FAIR Plan (insurer of last resort). UP defended the Commissioner's authority to regulate FAIR Plan rates and practices.

Why it matters: As private insurers exit the California market, more homeowners are forced into the FAIR Plan. Maintaining regulatory oversight prevents the FAIR Plan from becoming an unregulated insurer that can charge whatever it wants and deny claims without accountability.

American Insurance Association v. Garamendi (Insurance Commissioner) (2003)

California Court of Appeal

Issue:Whether insurers could cancel or non-renew policyholders simply for filing claims (“use it and lose it” practices). UP defended regulations prohibiting retaliatory cancellations.

Why it matters:If insurers can cancel your policy for filing a claim, the policy is worthless — you pay premiums for years but cannot use the coverage without losing it. Anti-retaliation protections are fundamental to insurance functioning as intended.

Fox Paine & Company v. Twin City Fire Insurance Co. (2025)

California Court of Appeal

Issue: Rules governing when an excess insurance policy is triggered (exhaustion of underlying coverage). UP briefed the court on how narrow exhaustion rules can leave policyholders without coverage despite paying for multiple layers of insurance.

Why it matters: While most relevant to commercial policyholders, the principles of stacking coverage and triggering excess layers apply to any policyholder with layered or umbrella coverage.

Yahoo Inc. v. National Union Fire Insurance Co. (2019)

California Court of Appeal

Issue:How ambiguous policy language should be interpreted. UP argued for strict application of California's contra proferentem doctrine — the rule that ambiguous policy language must be interpreted against the insurer who drafted it.

Why it matters: Contra proferentem is one of the most powerful tools available to policyholders. When the insurer wrote the confusing language and now claims it means something unfavorable to you, the court should construe it in your favor. Maintaining this doctrine prevents insurers from profiting from their own unclear drafting.