Beverly Ge, an environmental analyst at ERG, recently contributed to an article in Environmental Science & Technology Letters, a scientific journal published by the American Chemical Society. The article presents the results of using various modeling approaches to identify private wells in New Hampshire that may be susceptible to contamination by per- and polyfluoroalkyl substances (PFAS). PFAS have been widely used by industry and in consumer products for decades, and human exposure to PFAS has been linked to adverse health outcomes. Drinking water is an important pathway for human exposure to PFAS, and a critical data gap exists on the extent of PFAS contamination in private wells. The modeling approaches presented in this publication can be applied to other regions and used to prioritize sampling and testing in areas that are most likely to have harmful concentrations of PFAS.