This client alert is the fourth in a series that discusses the significant changes instituted by the passage of a new federal Toxic Substance Control Act (TSCA). The first alert addressed broadly the law’s myriad of changes. The second alert addressed how changes in the law will impact manufacturers, processors, and importers of new chemical and existing chemicals. The third alert addressed how TSCA, as amended, preempts state regulation of chemicals and preserves certain state laws and regulatory authority. A future alert will cover international impacts of the amendments.