1,4-dioxane has been detected in my well. What does the level mean?

In areas around the state where there is contamination, the MDEQ sets cleanup levels that help protect public health. This level is called a cleanup criterion. In the past, the cleanup criterion for 1,4-dioxane in drinking water was 85 parts per billion (ppb). Based on updated science, the MDEQ has developed a draft drinking water cleanup criterion of at or below 7.2 ppb for 1,4-dioxane. The MDEQ is proposing the draft drinking water cleanup criterion using updated cancer risk estimates determined by the U.S. Environmental Protection Agency (EPA). The MDEQ used the EPA’s Integrated Risk Information System’s number because it is the best available science and protects everyone - including children - when people drink water with 1,4-dioxane at or below this level.


Water with 1,4-dioxane levels at or below 7.2 ppb - Based on current science, if your test level for 1,4-dioxane is at or below the draft MDEQ drinking water criterion of 7.2 ppb, your risk of having health problems from drinking water is considered low. You may choose to use other sources of water, but these sources will not be provided by the MDEQ.
Water with 1,4-dioxane levels above 7.2 ppb - If your test level for 1,4-dioxane is above 7.2 ppb, the MDEQ will contact you to provide bottled water for drinking until city water is available.

Show All Answers

1. What is 1,4-dioxane?
2. What can 1,4-dioxane do to my health?
3. How do I know if 1,4-dioxane is in my drinking water?
4. 1,4-dioxane has been detected in my well. What does the level mean?
5. Which wells are tested?
6. What if I want to test my water?
7. Is the a filter I can put on my faucet to remove 1,4-dioxane?
8. Can I use my well water for drinking?
9. Can I use my well water for bathing, washing hands, or laundry?
10. Should I be concerned about breastfeeding my child if I drink water with 1,4-dioxane?
11. Water comes into my basement. Do I need to worry about 1,4-dioxane in the water?
12. Can I use well water in my humidifier?
13. What if I want more information about the 1,4-dioxane plume?