The Ninth Circuit Court of Appeals ruled that a letter from the EPA under section 104(e) of CERCLA, requesting information from a landowner at a Superfund site, constitutes a "suit" and therefore triggers an insurer's duty to defend. This decision, along with previous trial court rulings in Oregon, establishes that insurers must defend policyholders who receive such information request letters. The court's interpretation of Oregon's environmental insurance claims statute, the OECAA, broadened the definition of "suit" and rejected arguments that the statute impaired contracts. This ruling may impact many involved at the Portland Harbor Superfund Site and other contaminated sites in Oregon.