The Pease Study is the first site of the national Multi-site Study (MSS), which looks at health effects experienced by ten communities exposed to PFAS (per- and polyfluoroalkyl substances)  contaminated drinking water across the U.S. The MSS aims to expand the scientific understanding of drinking water exposure to PFAS and health effects and help address concerns about past exposure. The Centers for Disease Control and Prevention (CDC) and the Agency for Toxic Substances and Disease Registry (ATSDR) are evaluating the public health impact of drinking water contaminated with PFAS at the Pease International Tradeport and nearby wells in the Portsmouth, New Hampshire area. CDC and ATSDR want to understand more about how PFAS exposure affects human health.