Ever since Jacob Leinenkugel discovered spring waters here that were pure enough to brew his famous beer, this small Wisconsin city’s devotion to clean water has been paramount.  That’s why in 1997, when Chippewa Falls utility managers detected potentially dangerous concentrations of nitrates in a well supplying city water, officials acted. They installed new filtration […] The post This American City Perfected Clean Water for Beer — Now It’s Fighting to Keep Cancer-Causing Nitrates Out of the Tap appeared first on Circle of Blue .