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The reuse of resources obtained from regenerating. wastewater is an absolute must both from a social and also environmental and health viewpoint. For any water reuse project to be viable, water treatment processes must be optimised. In this sense, extensive knowledge of the structure of costs associated to each of the treatment technologies available is necessary. This research applies cost modelling methodology by adjusting a series of representative functions and an empirical analysis is undertaken for a sample of wastewater treatment plants in Spain.