Abstract
In order to meet the targets set by European Directive 91/271/EEC on treatment of urban wastewater, the Government of Aragon launched the Special Plan for Sanitation and Water Treatment (PESD by its Spanish initials). The plan aims to treat wastewater in all agglomerations with a population-equivalent of more than 1000 inhabitants. The challenge is a major one, given that Aragon's relatively small population is very widely dispersed over frequently mountainous terrain. For the purposes of the plan, Aragon has been divided into 13 zones and 132 treatment plants are being built for 172 centres of population. Each zone is managed by a 20-year administrative concession, while projects are financed by a ‘Sanitation Toll’ in accordance with the principle of cost recovery. The population centres participating in the programme will receive environmental and social benefits as they see their rivers brought back to life.
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