HHCB Environmental Hazard Draft Data Quality Evaluation

EPA has published a draft data quality evaluation for HHCB (Hexahydrohexamethylcyclopentabenzopyran), a synthetic musk compound used in consumer fragrance products. The document assesses the quality, reliability, and adequacy of environmental hazard data submitted or identified for this chemical substance as part of the TSCA risk evaluation process.

Affected parties—including chemical manufacturers, importers, fragrance industry stakeholders, and downstream users of HHCB—should review the draft evaluation and submit comments addressing data gaps, methodological concerns, or additional data sources that should be considered. The outcome of this data quality evaluation will influence EPA's subsequent risk determination and potential regulatory actions under TSCA Section 6.