There’s growing evidence that activities related to hydraulic fracturing can contaminate water supplies. A controversial draft report last year from the Environmental Protection Agency said the contamination was not widespread or systemic — yet for a number of households whose water has been tainted, and for many more who fear it is tainted, the struggle for clean water can sap energy and take years. Maryam Jameel from the Center for Public Integrity has the first of two stories on families in Pennsylvania desperate for answers.