This 2015 guide introduces climate change and adaptation planning to water sector utilities by outlining climate challenges based on type and geographic region. The Guide provides suggested adaptation strategies for system impacts associated with climate change challenges such as drought, water quality degradation, ecosystem changes, and changes in service demand and use. New features of the 2015 edition include: information based on updated models data from the U.S. Global Change Research Program 2014 Report, sustainability briefs addressing green infrastructure, energy management, and water demand management, and updated water utility climate adaptation case studies.