When the researchers reviewed the scientific literature, they found that in many cases, drinking water salinity levels outstrip federal thresholds. The salt isn’t the only problem: Salts also increase the amount of elements such as cadmium, lead and even radium in groundwater. And because brackish drinking water can corrode plumbing, de-icing is linked to leaching of metals such as lead into the water supply in places such as Flint, Mich.

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