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Persistent Pollutants

New York restricts 1,4-dioxane in cleaning and personal care products

State is first in US to limit level of this persistent pollutant in consumer goods

by Cheryl Hogue
December 13, 2019

Photo shows the hands of a person washing dishes in a sink.
Credit: Shutterstock
The persistent compound 1,4-dioxane is an unwanted industrial byproduct in some household cleaning products, including dish detergent.

New York is banning the sale of household cleaning and personal care products containing more than 2 ppm of 1,4-dioxane at the end of 2022. The state is the first in the US to set a maximum contaminant limit in products for 1,4-dioxane, which the US Environmental Protection Agency says is a likely human carcinogen and does not readily biodegrade in the environment.

Drawing shows the chemical structure of 1,4-dioxane.

The law, signed by Gov. Andrew M. Cuomo on Dec. 9, further tightens the limit to 1 ppm on Dec. 31, 2023. The law also prevents the sale in New York of cosmetics with more than 10 ppm of 1,4-dioxane as of the end of 2022.

The American Cleaning Institute, which represents producers of soaps and detergents, says the law is “ill advised” and could halt the sales of many common household products in New York.

The industry group says “minuscule amounts” of 1,4-dioxane can end up in some laundry and dish detergents. The chemical is an unwanted reaction byproduct of the ethoxylation process used to create ingredients such as surfactants and polyethylene glycols.

The advocacy group Citizen Campaign for the Environment has tested shampoos, body washes, baby products, laundry detergents, and hand and dish soaps for the presence of 1,4-dioxane and posted the results online.

Elevated levels of 1,4-dioxane, formerly used as a stabilizer in chlorinated solvents, primarily 1,1,1-trichloroethane, have been detected in drinking water across New York. Data show that Long Island has one of the highest levels found in the US, with contamination there stemming primarily from industrial operations, according to local officials.

The cleaning institute says the new law “will have no measurable impact on groundwater, and it will not have the intended effect for Long Island’s residents.”

There are no federal standards for 1,4-dioxane in drinking water, though the EPA has estimated there is a one-in-a-million lifetime cancer risk from drinking water with 0.35 ppb of the substance. The agency is evaluating the risks of 1,4-dioxane under the federal Toxic Substances Control Act. External science advisers recently took the agency to task for failing to consider exposure to consumers and the general population in that work.



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