The City of Boulder is responsible for supplying reliable, high-quality treated water to 120,000 customers. The reliability and quality of the water supply result from short-term operational decisions, long-term planning efforts and policy development that are informed by a variety of factors including scientific research, data, hands-on experience, economic considerations and community values. In this presentation, I鈥檒l discuss the role that scientific information and data play in operation, development and management of the Boulder鈥檚 water supply as well as the importance of communicating technical information to a variety of audiences.