Congress modernized the Toxic Substances Control Act (TSCA) in 2016 with the stated goals of better science, more federal authority to protect against unreasonable risk of injury to health and the environment, and the exercise of that authority in such a way that does not impede unduly or create unnecessary economic barriers to technological innovation.1 Six years into implementation of this law, the American Chemistry Council (ACC) is concerned that the TSCA program is failing to meet these goals. Continued failure could lead to major supply constraints on critical chemicals and applications, including but not limited to semiconductors, electric vehicles, pharmaceuticals, climate-friendly refrigerants, medical devices and water treatment. We respectfully request Congress reengage on TSCA before it is too late.