Does the District know the source of 1,4-dioxane?
The District has identified the main source of the substance as the Chemical Sales Co. Superfund site near 46th and Monaco St. in Denver, CO. Information we have gathered has been shared with the State and EPA who oversee remediation of the site. We are working alongside these agencies to perform additional groundwater sampling and testing. This work will further the efforts to better locate the origin of the contamination and inform future cleanup decisions related to this substance.

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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?