As required under the Toxic Substances Control Act (TSCA) and related implementing regulations, this proposed list initiates the prioritization process for 20 chemical substances as candidates for designation as High Priority Substances for risk evaluation and 20 chemical substances as candidates for designation as Low Priority Substances for risk evaluation. This document provides the identity of the chemical substances being initiated for prioritization, a general explanation of why the Agency chose these chemical substances and information on the data sources that EPA plans to use to support the designation.
EPA is providing a 90-day comment period (until June 19, 2019) during which interested persons may submit relevant information on these chemical substances.
Under the amended TSCA statute (section 6(b)(1)(B)) and implementing regulations (40 CFR 702.3), a High Priority Substance is defined as a chemical substance that EPA determines, without consideration of costs or other non-risk factors, may present an unreasonable risk of injury to health or the environment because of a potential hazard and a potential route of exposure under the conditions of use, including an unreasonable risk to potentially exposed or susceptible subpopulations identified as relevant by EPA. A Low Priority Substance is described as a chemical that EPA concludes, based on information sufficient to establish, without consideration of costs or other non-risk factors, does not meet the statutory criteria for designation as a High Priority Substance.
The EPA text from the Federal Register can be found at this link.