Water Talk – 1,4-Dioxane in drinking water

We have developed guidelines for 1,4‑dioxane in drinking water to protect the health of Canadians. Learn about the health effects of 1,4‑dioxane and how to reduce your exposure if it is present in your drinking water.

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1,4‑dioxane in drinking water

1,4‑dioxane is a human‑made chemical that is not found naturally in the environment. It is released in the environment mainly from:

It can be present in:

1,4‑dioxane is generally not found in drinking water supplies in Canada. In some cases, it has been found in groundwater located near landfills and industrial sites.

The only way to know if you have 1,4‑dioxane in your drinking water is to have your water tested. Contact your local public health authority for advice if you are interested in testing your drinking water, particularly if you have a private well.

Health effects of 1,4‑dioxane in drinking water

Drinking water that has high levels of 1,4‑dioxane may affect your liver and kidneys.

If you have concerns about your drinking water or health, contact your public drinking water authority or public health authority for more information.

How to reduce your exposure to 1,4‑dioxane in drinking water

You can install a reverse osmosis unit directly at the tap to help remove 1,4‑dioxane.

Make sure that any unit or system you buy is:

To make sure the treatment unit is working, you should conduct regular testing on:

Bathing and showering in water that contains 1,4‑dioxane should not be a health risk.

If you are pregnant or breastfeeding

You should have your drinking water tested if you are pregnant, breastfeeding or preparing infant formula and suspect that your drinking water may contain 1,4‑dioxane. If 1,4‑dioxane levels are above the limits, you may wish to:

Limit for 1,4‑dioxane in drinking water in Canada

We worked with provinces and territories to set a maximum level for 1,4‑dioxane in drinking water. The maximum acceptable concentration (MAC) is 0.050 milligrams per litre (mg/L). This level protects the health of all Canadians, including the most vulnerable members of society, such as infants and children.

Related information

Guidelines for Canadian Drinking Water Quality for 1,4‑dioxane.

If you have questions about the guidelines or 1,4‑dioxane in drinking water, you can contact us at:

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