Water stress, either caused by droughts, competing water uses or hydrological conditions is an important driver for an efficient water management by all water users. This applies to many regions across the world. Water reclamation and reuse – “Overcoming Water Stress by Water Reclamation and Reuse” – is the key strategy to cope with these problems. The 12th IWA International Conference on Water Reclamation and Reuse brings together experts from research and development, solution providers and application.