Control aiming to assess, as part of the water status monitoring programme, the overall status of water and (long-term) evolution trends of the river basin, these changes being either natural or caused by human activities.
Control, as part of the water status monitoring programme, designed to look for the pressure which causes an observed degradation. It is carried out when the reasons for any significant alteration of the environment are unknown, to determine the causes for a water body not meeting the environmental objectives (when operational control has not yet been established), or for monitoring
Control of surface waters, as part of the water status monitoring programme, listed in the Register of protected areas : intakes of drinking water intended for human consumption (more than 100 m3/day on the average), water bodies of species habitat and protection areas (which are included in the operational monitoring programme when they may not meet their environmental goals).