Is this substance in my water?

The testing that the District has conducted for the presence of 1,4-dioxane has confirmed that this substance is present in some of the District’s groundwater supplies. Tests on treated drinking water confirm the presence of this substance at an average concentration of 1.3 parts per billion in District water supplies in 2016.

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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?