EPA releases common assumptions/default values used in TSCA new chemical risk assessments (transparency update)

EPA published documentation describing common assumptions (including default values) used in assessing new chemicals under TSCA, intended to increase transparency and improve the efficiency of the new chemicals review process. For PMN/SNUN submitters, this is actionable for aligning submissions with EPA’s stated assumptions to reduce follow-up information requests and better anticipate EPA’s exposure and hazard assessment approaches.