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📋 '''Pollution event''' is a discrete release, discharge, or escape of a [[Definition:Pollutant | pollutant]] into the environment that may give rise to [[Definition:Claims | claims]] under an [[Definition:Insurance policy | insurance policy]] — whether under a [[Definition:Pollution legal liability insurance | pollution legal liability]] form, a [[Definition:Commercial general liability (CGL) insurance | CGL policy]] (to the extent a pollution-related claim survives the [[Definition:Pollution exclusion | pollution exclusion]]), or a [[Definition:Property insurance | property]] or [[Definition:Inland marine insurance | inland marine]] form covering first-party cleanup costs. The concept is central to coverage analysis because the way an insurer classifies a pollution event — as a single [[Definition:Occurrence | occurrence]] or multiple occurrences, as sudden or gradual — determines which policy periods respond, how [[Definition:Deductible | deductibles]] and [[Definition:Self-insured retention (SIR) | self-insured retentions]] apply, and whether [[Definition:Aggregate limit | aggregate limits]] are exhausted.

⚙️ Determining what constitutes a single pollution event versus a series of related events is one of the most contested issues in environmental [[Definition:Claims | claims]] handling. Policies that use "pollution event" as the coverage trigger often define it as any one emission, release, or escape that begins at a specific time and place. If contamination is discovered to have migrated over months or years — common in groundwater plume scenarios — disputes arise over whether the gradual seepage is one continuous event or a succession of discrete ones. [[Definition:Underwriting | Underwriters]] address this through carefully worded [[Definition:Policy definitions | definitions]] and, in many environmental policies, through "related-events" clauses that aggregate connected releases into a single event for purposes of [[Definition:Limit of liability | limits]] and [[Definition:Deductible | deductible]] application. [[Definition:Claims adjuster | Adjusters]] and environmental consultants typically work together to establish the timeline, source, and pathways of contamination, with findings that directly shape the financial outcome of the claim.

🌍 The stakes around characterizing a pollution event extend well beyond individual claim settlements. For [[Definition:Reinsurance | reinsurers]] sitting above a [[Definition:Retention | retention]] on environmental books, the event definition determines whether losses pierce the [[Definition:Reinsurance attachment point | attachment point]] and how they accumulate against treaty limits — making it a focal point of [[Definition:Reinsurance | treaty]] negotiations. On the regulatory side, state and federal environmental agencies (such as the EPA) may impose [[Definition:Remediation | remediation]] obligations that create long-tail liabilities running for decades, and insurers must align their event definitions with these real-world cleanup timelines. The growing frequency of so-called "emerging" pollution events — PFAS contamination, microplastic releases, pharmaceutical runoff — is pushing carriers to re-examine legacy definitions and introduce more precise language that addresses substances and exposure pathways the original policy drafters never anticipated.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Pollutant]]
* [[Definition:Pollution exclusion]]
* [[Definition:Occurrence]]
* [[Definition:Pollution legal liability insurance]]
* [[Definition:Environmental impairment liability insurance]]
* [[Definition:Long-tail liability]]
{{Div col end}}

Definition:Pollution event - Revision history

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