The EPA and HHS recently announced the draft Sixth Contaminant Candidate List (CCL6) for public review. This marks the first federal recognition of microplastics and pharmaceuticals as priority contaminants in drinking water and initiates a regulatory evaluation process that may lead to future enforceable standards. While scientific uncertainties and challenges remain in measurement and toxicological data, the draft CCL6 announcement signals increased federal scrutiny and highlights the need for environmental professionals to prepare for expanded monitoring and compliance efforts.