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WATER GREMLIN PUBLIC HEALTH ASSESSMENT Appendix D - 1,4-Dioxane in Private Wells -- Gem Labe and the White Bear Area 3 DEPARTMENT OF HEALTH 1,4-Dioxane in Private Wells - Gem lake and the. White Bear Area 8/24/2021 MDFI'r3rinkir"`'water:` uidarice.. al What is 1A-dioxane? The main. use .of.l,4-dioxane was. as. a stabilizer for the chlorinated solvent 1,1,1-trich10roethane (often used for industrial, purposes).:1;4-dioxane can also be. an unintended, contaminant in the production of certain. products, includingsome. cleaners, detergents, adhesives, inks; automotive fluids, etc.. Groundwater contaminated with 1,4-d.ioxane..is largely caused by the historical use and..disposaI of chlorinated solvents. How can I be exposed to 1,4-dioxane7. Prinking contaminated water is the primary way.people are.exposed. Minor sources of exposure. are food prepared with contaminated water and incidental ingestion and inhalation of water vapor during showering. Absorption.through the skin is also thought to be insignificant. MOH Health Risk Limits Minnesota Department of I Health (MDH) uses Health Risk Limits (HRLs)"to protect people's health from drinking water contaminants. The table below shows three HRL values#or 1,4- dioxane set by MDH,.for differing time.frames and possible health endpoints theya.re based on. The 1,4-dioxane. HRL of 1 part.per billion (ppb) represents an amount of a. contaminant that poses little or no health. risk to those drinking the. water daily for a lifetime, including sensitive or highly exposed. people. M D H I Health Rislc Limits for 1,4-Dioxane: 10uratiori ::.`-< " HRL' h * n Health<Ercl of t Subchronic (>a0. days sap to 1.% of a lifetime) 300 Liver, kidney; and respiratory systems Chronic (>10%.of a lifetime) 100 Liver, kidney, and respiratorysystems Lifetime.10-70 years) 1 Cancer *HRLs are shown in 0nits of parts per billion (ppb). This is the same as micrograms. per liter (µg/L).