The drinking water from four Long Island water suppliers that operate wells serving about 150,000 customers has been found to exceed the enforceable standard for the potentially carcinogenic chemical 1,4-dioxane.

The water suppliers provide drinking water to the Jericho Water District, the village of Hempstead, the Town of Hempstead and Liberty Water’s Merrick district.

“We really have no clue for how many years the public has been exposed to 1,4-dioxane,” said Sarah Meyland, a former professor of environmental technology at the New York Institute of Technology.

The EPA has identified 1,4-dioxane as a probable carcinogen, used as an industrial solvent, in spray foam insulation, adhesives and sealants, and is found in household detergents, soaps and cleaning products. 1,4-dioxane leaches into groundwater from industrial sites and landfills, and it has been detected in 70% of Long Island’s public wells.

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