What level of 1,4-dioxane is considered safe in drinking water?

The EPA has established safe levels for over one hundred substances that may be in public drinking water sources. There is no EPA or State of Colorado drinking water standard for 1,4-dioxane. The EPA has set a health advisory level of 35 parts per billion for 1,4-dioxane. The average concentration in the District’s drinking water is 1.3 parts per billion which is well below this EPA health advisory level. EPA health advisories are informal guidance levels for unregulated substances in drinking water, issued by the federal government to help states, local health officials, and community water systems in protecting public health. 

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1. Is my drinking water safe?
2. Is this substance in my water?
3. What is a part per billion?
4. How did the District find out that 1,4-dioxane was in the District’s groundwater sources?
5. What is 1,4-dioxane?
6. What level of 1,4-dioxane is considered safe in drinking water?
7. What is the District doing now that it knows this substance is present in the water?
8. Does the District know the source of 1,4-dioxane?
9. How are the State and EPA working to address the source of 1,4-Dioxane in the District's drinking water supply?
10. How will the District keep customers informed about the occurrences of 1,4-Dioxane?
11. How can I contact the District to get more information on this topic?