Nationwide, approximately 48 million people use private wells, including nearly 3 million in Pennsylvania. The water quality from these largely untreated wells is not federally regulated, and there have been few studies on both the extent and the source of microbial contamination in private wells.  In a new randomized controlled trial, Heather Murphy, assistant professor of epidemiology and biostatistics, will research the effects of drinking untreated well water on children ages three or under—effects that include gastrointestinal and respiratory symptoms from norovirus, Gi...