Risks have arisen even in protected National Parks, such as the Tablas de Daimiel, which are now fed by artificial surface water supply. Eighty-seven per cent of wetlands are, moreover, unprotected (Garcia Novo et al., While 97% of abstractions for human consumption comply with the nitrate regulations (MARM, 2008b), 25% of measuring stations reported very high concentrations of nitrates (more than 50 mg N03 per litre) in Spain in 2008. This share is larger than in almost all other European countries for which data are available from the European Environment Agency.2 Nitrate pollution mostly reflects diffuse pollution from agriculture and cattle-raising, although the consumption of nitrate-based fertilisers has fallen by about 25% since its peak in 2003.