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U.S. rivers and streams have become saltier and more alkaline over the last 50 years, posing risks to drinking water by damaging pipelines and other infrastructure, according to a study released on Monday.

As municipal workers dump salt on roads to combat ice and farmers put fertilizer on fields, the runoff has made U.S. waterways saltier and more alkaline, according to the study, which examined decades of data recorded from 232 U.S. Geological Survey monitoring sites.

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