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On the one hand the water quality field is increasingly diverse and complex, on the other hand there is an increasing demand from the public, water managers and all stakeholders for simplified water quality indicators integrated over time and space, and appropriate to specific issues. The evolution of water quality is also of concern at the global scale (Vorosmarty and Meybeck, 2004). Questions raised by this evolution are presented here in the hope of opening a forum on this topic.