The data presented in this study based on period 2008-2010 and rough estimate of fresh water requirement in crop production that optimal assumption. For assessment of the WF of crops, the study integrated information from several sources which adds a degree of uncertainty. For example, the CROPWAT model required input of planting date that was base on an assumption of data from Department of Agriculture which is not the same as the actual planting date. In fact, farmers are cultivating the crop in the rainy season which may differ from the reference in the calculation. Although the study cited data from the literature, it shows that water use efficiency of crops. The result from this study provides suitable guidelines for the management of water resource in northern Thailand.