Ball and stick model of the 1,4-dioxane molecule. Public health and environmental justice groups in Eastern North Carolina are calling for a judicial review of a recent federal report that the groups say understates the cancer risk to consumers from a compound found in household cleaning products that contaminates drinking water supplies across the region and beyond. The groups, Advance Carolina, Cape Fear River Watch, Center for Environmental Health, Clean Cape Fear, Democracy Green, Haw River Assembly and Toxic Free NC, say they are deeply concerned about widespread 1,4-dioxane contamination of the Cape Fear and Haw Rivers and other drinking water sources for hundreds of thousands of North Carolina residents. They said drinking water supplies in the state have among the highest levels of 1,4-dioxane in the country.