It's a corrosive problem. Residents of the city of Flint in Michigan have been facing lead poisoning from their drinking water since switching from Detroit's water system to water from the Flint river in 2014. The latter is more corrosive to the lead pipes it flows through, and does not carry corrosion inhibitors. Since February 2015, tests have been finding lead levels far exceeding advised limits of 15 parts per billion. Now the city may have a chance to rebuild its ailing infrastructure. This month, US president Barack Obama declared a federal emergency and announced $80 million in aid to fix the problem.
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