Abstract: A method based on linear programming was proposed to design water network in batch chemical processes with a single contaminantThe aim was to determine the optimal water use structure for fresh water minimization in each operation cycleEach operation in batch processes was assumed to connect with a tankThese operations are arranged in the order of outlet concentration from low to highThis method avoided the re-use-of high concentration water in the operation with low concentration waterThen a superstructure was developed which entailed all the re-use possibilitiesBy solving the linear programming model corresponding to the superstructure with general algebraic modeling system(GAMS), the minimal fresh water was identifiedFurthermore, it was proved that the final minimal fresh water reached a fixed value with repeating operation cyclesThe proposed method could be applied to the optimization of batch water network with or without a storage tankThe results of the case study show that the method is feasible and simpler than other methods.