The avoidance of water pollution is one of the main challenges of south-west European countries. Although current legislation obliges administrations to control their “priority pollutants”, supervision programmes have detected the diffuse and persistent pollution of “emerging” pollutants which are not affected by traditional purification treatments. The objective of this project is the carrying out of a study on the dumping of wastewater from old people’s homes in south-west Europe so as to install technologies for the treatment and follow-up of drugs.