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Carcinogen 1,4-Dioxane Taints Tap Water Nationwide

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Average 1,4-Dioxane Levels for Public Water Systems from 2010 to 2015

For this analysis, EWG combined data from the EPA’s Third Unregulated Contaminant Monitoring, or UCMR3, program – nationwide water testing conducted primarily between 2013 and 2015 – together with results of water testing that some utilities conducted from 2010 to 2015. UCMR data are available on the EPA website, and state drinking water agencies provided the additional data in EWG’s Tap Water Database..

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