Waterborne Transit has the potential to transform cities and positively affect the behavior and quality of life of metropolitan residents. The attractiveness of waterborne transit is related to several unique features, including route flexibility, limited infrastructure requirements, a relaxing and pleasant transit experience and utility in emergency situations. A passenger-only ferry (POF) system that is properly integrated into the broader multi-modal transit system could be an important transportation link in the city of the future. A major challenge of establishing and sustaining viable POF routes and systems is the need for significant behavioral changes among the target population. In other words, sustainable success of these systems is highly dependent on many different factors, including certain cultural factors that are difficult to measure. The purpose of this paper is to develop an LCA tool that will facilitate a forward-looking evaluation of the sustainable viability of starting up POF service for a given site or region.