Evaluation of wells drilled for fresh water present special problems in log analysis. In such analyses the problem is not to distinguish between two types of fluid, as in the evaluation of oil prospects, but to determine the quality and quantity of water that may be obtained from various strata. It has previously been shown that apparent formation factor in freshwater sands is sensitive to three factors: porosity, water resistivity, and effective grain size. Therefore, values of porosity and true resistivity are inadequate to predict formation water resistivity. This paper presents an alternative solution utilizing true resistivity, flushed zone resistivity, and mud filtrate resistivity to determine formation water resistivity. In addition, permeability may be determined from porosity, formation water resistivity, and true resistivity. Utilization of water resistivity and spontaneous potential derived activity provides an improved determination of total dissolved solids and also yields a water hardness index. Applications include the determination of formation water quality, permeability (transmissivity), yield, and volume (storativity). This methodology is easily quantified and can be used on an area-wide basis for regional resource assessment.