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WATER .GREMLIN PUBLIC HEALTH ASSESSMENT: PUBLIC COMMENT DRAFT <br />Figure 11: 2020-2021 Prlvdte Well Testing Results for 1,4-0ioxone <br />MDH 1,4-Dioxane Health Risk Limit <br />MDH developed a Health Risk Limit of 1 ppb for 1,4-dioxane: in drinking water in 2013: The HRL <br />represents an amount of a contaminant that poses*liftle:or no health risk to those.drinking the water <br />daily fdra lifetime, l'ncluding,sensitive or highly expbsed people. L,4-Dioxane-is..coltsidered a likely <br />human carcinogen, based on studies of ahimals exposed.to .vety h1gh:aMourit5. The HRL of 1 ppb is <br />based on a negligible cancer risk of one -additional cancer in 100,000 people consuming the water fora <br />lifetime. The highest concentrations detected* In -well water In -Gem Lake arejust above the HRLand <br />present a low health risk. Most of the wells' results are less*than 1 ppb'and are. considered safe fdr <br />household .use by MDH. Appendix D presents an information sheet developed for and shared.with*the <br />commurllty about 1,4-dioxane exposure and health in Gem Lake. <br />38 <br />