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Tough decisions ahead for US chemical regulators

The US Environmental Protection Agency has its work cut out for it this year. Under the Toxic Substances Control Act (TSCA), the agency faces a June deadline to finalize risk evaluations for 10 chemicals already on the market. The agency must also begin reviewing an additional 20 high-priority chemicals in order to complete those evaluations within 3–3½ years. On top of that, the EPA is expected to evaluate the risks of two phthalates—diisononyl phthalate and diisodecyl phthalate—as requested by manufacturers. The EPA has been evaluating the first 10 chemicals since TSCA was revised in 2016. It has yet to release draft assessments for four of them, including two particularly controversial substances: asbestos and trichloroethylene. The agency plans to publish those drafts early this year to give stakeholders and its TSCA advisory committee time to provide input before the June deadline. Once the EPA finalizes all 10 reviews, the agency will