Hornby Island residents have an ongoing concern with the declining quality and quantity of their drinking water. This has become of greater concern in the past years as Hornby Island has become a more desired destination for vacationing in summer months. There are no adequate supplies of natural surface water on Hornby Island for drinking water and therefore, residents depend solely on the present limited supply of groundwater and water shipped to the Island. These concerns have prompted residents of Hornby Island to assess the importance of protecting their water supply. In turn, there is a need for determining what areas on the island are more vulnerable to aquifer contamination. In determining the aquifer vulnerability of Hornby Island by applying the DRASTIC model, we hope to provide a visual representation and guidance to future development decisions on the island.