Guidelines for Canadian Drinking Water Quality: Guideline Technical Document - 1,4-Dioxane (English, HTML)

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2021-11-30

1,4-Dioxane is a synthetic chemical that is not found naturally in the environment. It is produced in Canada and imported from other countries, primarily to be used as an industrial and commercial solvent. It can also be present as a contaminant in cosmetics, food additives, and food packaging materials, or on food crops treated with pesticides containing 1,4-dioxane. Its release to the environment is mainly from chemical waste disposal practices, leaks from landfills, or wastewater discharges. Because of its chemical properties, 1,4-dioxane travels rapidly, partitioning from soil to groundwater sources. A maximum acceptable concentration (MAC) of 0.050 mg/L (50 µg/L) is established for 1,4-dioxane in drinking water.

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