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📋 '''Pollutant''' is a term used in [[Definition:Insurance policy | insurance policies]] — most notably in [[Definition:Commercial general liability (CGL) insurance | commercial general liability (CGL)]] and [[Definition:Property insurance | property]] forms — to define the substances that trigger or fall under a [[Definition:Pollution exclusion | pollution exclusion]]. Standard [[Definition:Insurance Services Office (ISO) | ISO]] CGL language defines a pollutant broadly as any solid, liquid, gaseous, or thermal irritant or contaminant, including smoke, vapor, soot, fumes, acids, alkalis, chemicals, and waste. This sweeping definition has been the subject of extensive litigation, because its breadth can encompass everyday substances — carbon monoxide from a faulty heater, for instance — that policyholders may not intuitively associate with "pollution."

⚙️ Courts across the United States have interpreted the term inconsistently, creating a patchwork of case law that [[Definition:Underwriting | underwriters]], [[Definition:Claims adjuster | claims adjusters]], and coverage attorneys must navigate carefully. Some jurisdictions apply the definition strictly and literally, upholding exclusions whenever the substance at issue fits the policy's language regardless of context. Others adopt a "reasonable expectations" or "traditional environmental pollution" approach, limiting the exclusion to scenarios involving industrial-type contamination and declining to apply it to commonplace incidents like an accidental chemical spill inside a building. This jurisdictional variation means that a [[Definition:Claims | claim]] involving the same substance can be covered in one state and excluded in another, making [[Definition:Loss reserving | reserve]] setting and [[Definition:Coverage opinion | coverage opinions]] inherently complex.

🔬 The practical importance of how "pollutant" is defined ripples through product design, [[Definition:Risk selection | risk selection]], and [[Definition:Reinsurance | reinsurance]] structuring. Carriers writing [[Definition:Pollution legal liability insurance | pollution legal liability]] coverage must craft their own definitions with precision, often narrowing or expanding the standard language to match the risk profile of the insured industry — a hazardous-waste hauler faces a very different pollutant universe than a retail dry cleaner. For [[Definition:Insurance broker | brokers]] advising clients in manufacturing, energy, or real estate, understanding the specific pollutant definition in each policy layer is essential to identifying gaps where a [[Definition:Loss | loss]] could fall outside both the CGL and any standalone environmental policy. As regulatory attention to emerging contaminants like PFAS intensifies, the boundaries of the term continue to evolve, prompting fresh rounds of policy language revisions and [[Definition:Endorsement | endorsements]].

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Pollution exclusion]]
* [[Definition:Pollution event]]
* [[Definition:Pollution legal liability insurance]]
* [[Definition:Commercial general liability (CGL) insurance]]
* [[Definition:Environmental impairment liability insurance]]
* [[Definition:Endorsement]]
{{Div col end}}

Definition:Pollutant - Revision history

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