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Water for agriculture is under pressure as it competes off withresidential, industrial and commercial users in the LajasValley, Puerto Rico. It can reasonably be assumed that the same scenario will come up in other regions of Puerto Rico and in other countries. As the people of Puerto Rico seek feasible alternatives for green energy, a bioenergyproject based on sugarcane ethanol is being considered for over 24,281 ha (60,000 ac) of prime farmland in the LajasValley. It is therefore imminent that a conflict for water use will come up in the near future that requires a very good understanding of reasonable water use for agriculture and other water users in southwestern Puerto Rico. The LajasValley is one of the most important agricultural regions in Puerto Rico. The LajasValley is considered dry with less than 1,100 mm of precipitation per year; however the region is well suited for irrigation with a system that transports water from the wet north facing slopes to the dry south valley through a series of interconnected lakes and tunnels. Predicting sugarcane water needs now and in the future is a critical issue for the sustainability of any agricultural enterprise in the region. Sugarcane has high water requirements and it is high sensitivity to drought (FAO, 1986). The objective of this work was to study the impact on irrigationrequirements using different climate change scenarios. In this study, climate change was defined as change in precipitation and temperature only.