According to this study, Kenya"s low freshwater endowment of 526 m3 per capita per year puts it in the bottom 8% of countries globally. Lack of water security causes economic losses and constrains growth potential. Kenya"s limited water storage capacity leaves the country vulnerable to climate and hydrologic variability. Inadequate development of water resources infrastructure leads to low water supply reliability and limited access to water. Catchment degradation compounds these challenge. The objective of this study is to advance the process of prioritizing water storage investments that could reduce water stress in economically important areas. The results of the water balance analysis show significant regional water deficits even though Kenya on average is not water stressed.