We are on the cusp of another milestone in the decades-long Montrose Chemical litigation, which has already yielded many important precedents in California on coverage for so-called “long-tail” pollution liabilities. “Long-tail” claims arise under historical comprehensive general, umbrella and excess liability policies for alleged pollution that was in progress through multiple policy periods—such as underground tank leaks, seepages from waste disposal impoundments, and similar occurrences taking place over time. Whether the so-called “qualified pollution exclusion” bars coverage for such long-tail claims is a question that has divided courts for decades. Now the California Supreme Court has agreed to hear a critical appeal that puts the interpretation of the qualified pollution exclusion in play—with potentially seismic impacts.
