The main rule included in IPPC directive (Directive 96/61/EC) obligating installation owners to operate in the sustainable way in order to reduce the impact on the environment. Water resources are limited, therefore many industries, in particular in water-stressed areas, must invest in water-saving programs. In particular, this problem applies to paper plants, which should limit their consumption of fresh water. However, the main environmental consequence in the production of pulp and paper refers not only to the consumption of water resources, but also to the emission of wastewater resulting from the production process. This paper focuses on the concept of sustainable management of water and wastewater. The proposed approach is demonstrated with a case study. The different treatment facilities option has been tested to find the optimal solution to minimalize consumption of fresh water and reduce effluent loads. The optimal water-wastewater configuration was found by testing several configurations. We concluded that striving for a nearly full circulation loop closure is not always justified by sustainable development and should be assessed in an integrated way.