Ground water is the source of domestic drinking water for about 50% of the population of the United States. In order to protect this valuable resource from contamination the 1986 Federal Safe Drinking Water Act Amendments require each state to develop a wellhead protection program for their public drinking water supply systems. Colorado's Wellhead Protection Program, approved by the EPA in 1994, takes a voluntary, non-regulatory approach to wellhead protection. Communities within Colorado have been encouraged to develop wellhead protection programs based on the State guidance document, Colorado Wellhead Protection Program. This project focused on three components of wellhead protection: delineation of wellhead protection areas (WHPAs), public participation, and identification of potential contaminant sources within a WHPA. Teller County, situated in the mountainous region of central Colorado, was the site of these wellhead protection efforts. Wellhead protection areas were delineated for nine communities in Teller County. One of these, the community of Highland Lakes, also participated in a public education campaign and contaminant inventory. The majority of Teller County's public drinking water supply wells are completed in fractured granite. This geologic setting makes delineation of wellhead protection areas a particularly challenging task. Wellhead protection areas were delineated using a combination of analytical modeling and hydrogeologic mapping techniques. The hydrogeologic data used in the analytical model and the model outputs and final WHPAs are summarized in this report.