A letter about testing her well water forced Michelle Reffelt to revisit the loss of her first husband to cancer, WPRI reported. After tests showed PFAS levels in the well at her Tiverton, Rhode Island, home were far above state guidelines, Reffelt began to wonder whether the chemicals had anything to do with the loss that devastated her family. What happened? Severe abdominal pain led to a cancer diagnosis for Bob Ferzan in 2007, and he died wi…