EPA announces TSCA chemical risk evaluation path forward
On June 30, 2021, EPA announced policy changes to risk evaluations issued under the Toxic Substances Control Act (TSCA). The announcement laid out a path forward for the first ten chemicals that will undergo this adjusted risk evaluation. TSCA requires EPS to review risks associated with high-priority chemicals already on the market, identify cases where an unreasonable risk is present, and take action to manage any unreasonable risks found.
First, EPA is looking at ways people and communities are exposed to chemicals from business operations, also called fenceline exposure. Specifically, this will include the re-opening and update to the 1,4-dioxane risk evaluation. EPA will look at including drinking water and air exposures and the production of 1,4-dioxane as a process byproduct. EPA it intends to take public comment on potential revisions to the 1,4-dioxane risk evaluation before it will be finalized.
For six other chemicals, methylene chloride, trichloroethylene, carbon tetrachloride, perchloroethylene, NMP, and 1-bromopropane, EPA plans to revisit risk evaluations for fenceline exposure. The agency is developing a screening-level approach, using existing data, to conduct ambient air and surface water fenceline assessments. Depending on the results of this initial screening, EPA will either move forward to risk management rulemakings or conduct more comprehensive exposure evaluations.
Second, EPA is revisiting risk evaluations related to the use of PPE. The agency is validating “no unreasonable risk” findings that had been based on the use of PPE to protect employees in the workplace. This change could impact previous conclusions about risk for some conditions of use for methylene chloride, 1-bromopropane, HBCD, NMP, perchloroethylene, and 1,4-dioxane.
Even with these process changes, EPA does have three chemicals ready to advance into the risk management rulemaking stage. For HBCD, PV29, and asbestos (part 1: chrysotile asbestos) EPA intends to reissue the risk determinations, incorporating the announced process changes, then, as quickly as possible, work on risk management for the three substances.