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The Delaware River salt line is 20 miles north of where it should be this time of year

Salty oceanwater is creeping up the Delaware River, the source for much of the drinking water for Philadelphia and millions of others, brought on by drought conditions and sea level rise. It’s prompting officials to tap reservoirs to push the unpotable tide back downstream. Officials say drinking water isn't imminently at risk yet, but they're monitoring the effects of the drought on the river and studying options for the future in case further droughts sap the area.
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