Agricultural non-point source pollution is of increasing concern as attested by the implementation of new regulations like the European Water Framework Directive 2000/60/EC. Actions can be taken at different scales. At the local scale, fertilizers and pesticide application rate reduction should first be implemented. However, complementary actions at the watershed scale are needed since remaining applied molecules will transfer from the watershed to natural receiving waters. Among them, artificial wetlands including pond and reservoir are suspected to be able to provide nitrate and pesticides mitigation. The aim of this study is to observe the efficiency of a pond/reservoir to remove nitrate and pesticides from agricultural drainage water in intensive agricultural catchment located in Ile de France region of France, over the period 2007-2012.