Dioxane

Safety

Dioxane is classified by several government agencies as a potential cancer-causing chemical. It is also classified by the IARC as a Group 2B carcinogen: possibly carcinogenic to humans because it is a known carcinogen in other animals. In 2024, the United States Environmental Protection Agency classified dioxane as a probable human carcinogen and an unreasonable risk to human health, which establishes a legal basis for federal regulation under the Toxic Substances Control Act. The State of New York has adopted a first-in-the-nation drinking water standard for 1,4-dioxane and set the maximum contaminant level of 1 part per billion.