This problem formulation and initial assessment examined likely 1,4-Dioxane exposure and hazard scenarios to workers and consumers based on current production, use, and fate information. The goal of this problem formulation and initial assessment was to identify scenarios where further risk analysis may be necessary. On April 20, 2015, EPA released a problem formulation and initial assessment. The conclusions are: a) there are no risks to the general population through exposure to air emissions; b) an assessment of risk from drinking water is not needed at this time because 1,4-Dioxane is currently being monitored and EPA will determine whether or not regulatory action is needed as part of its Regulatory Determination Process; c) EPA/OPPT will further assess risks to workers and consumers exposed to 1,4-Dioxane through certain uses. EPA plans to review and evaluate the results of previous exposure assessments and health benchmarks for this chemical. As a result, EPA/OPPT will develop margins of exposure and cancer risk estimates to evaluate the potential risks from worker and consumer exposure to 1,4-Dioxane.

Return to risk evaluation for 1,4-Dioxane

• 1,4- Dioxane Problem Formulation and Initial Assessment (PDF)(54 pp, 2 MB, April 2015, 740-R1-5003)