Santos, LeniseFerreira, JoséSilva, MariaSimões, LuisFerreira, MiguelBrás, Isabel2025-01-092025-01-092024L.M.L. Santos, J.V.R. Ferreira, M.E.F. Silva, L.M.F. Simões, M.D. Ferreira, I.P.L. Brás (2024). Risk assessment of reusing treated water from the Viseu Sul WWTP for irrigation and similar uses. The 11th International Conference on Energy and Environment Research “Renewable Energy Towards Decarbonization”. Nídia de Sá Caetano and Carlos Felgueiras (editors). Instituto Superior de Engenharia do Porto, e-Book, pp 23-24.978-989-35251-8-0http://hdl.handle.net/10400.19/8735Due to the growing water scarcity, the reuse of treated wastewater arises as a possibility for sustainable water management. However, it is necessary to evaluate the possible risks associated with its activity. This study aims to develop a risk assessment of water for reuse, in terms of public health and water resources, for production and internal use by the Viseu Sul Wastewater Treatment Plant (WWTP) and external use in irrigation of green spaces in Viseu. The methodology used was a semi-quantitative risk assessment. The results demonstrated the viability of the production and use of Reused Water by the Viseu Sul WWTP, with an overall risk to public health of 0.68, and for use in irrigating green spaces in Viseu, with an overall risk of 0.75. The overall risk to water resources was 2.33 for nitrogen and phosphorus and 0.78 for E. coli. All risks were considered insignificant, considering the criteria defined by the method. Based on the information presented, it can be inferred that the use of treated wastewater to meet Viseu's water needs is a viable option.engRisk assessmentWastewaterWater for Reusebook part