Hi all…a proposed guideline technical document on 1,4-dioxane in drinking water is available for public comment on the Health Canada website. A maximum acceptable concentration (MAC) of 0.050 mg/L (50 μg/L) is being proposed.
Available at: www.canada.ca/en/health-canada/programs/consultation-1-4-dioxane-drinking-water.html For comparison, the USEPA includes 1,4-dioxane in its Final CCL 4 Chemical Contaminant List but isn’t proposing a maximum contaminant level (MCL) yet.
Comments and suggestions must be submitted to HC.water-eau.SC@canada.ca by November 9, 2018.
Bill
Part I. Overview and Application
“1.0 Proposed guideline–A maximum acceptable concentration (MAC) of 0.050 mg/L (50 μg/L) is proposed for 1,4-dioxane in drinking water.
2.0 Executive summary
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 through soil and can quickly reach groundwater sources.
This guideline technical document reviews and assesses all identified health risks associated with 1,4-dioxane in drinking water. It incorporates available studies and approaches and takes into consideration the availability of appropriate treatment technology. Based on this review, the proposed guideline for 1,4-dioxane in drinking water is a maximum concentration of 0.050 mg/L (50 μg/L). During its May 2017 meeting, the Federal-Provincial-Territorial Committee on Drinking Water reviewed the guideline technical document for 1,4-dioxane and gave approval for this document to undergo public consultation.”
