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Certain ingredients in shampoo, detergents and other cleaning agents may help form a suspected cancer-causing contaminant in water. The poorly understood water contaminant, called NDMA, is of ongoing concern to health officials.
NDMA and other nitrosamines can form during water disinfection with chloramine. Substances called quaternary amines, which are found in cosmetics and household cleaning agents, may play a role in the formation of nitrosamines.