The purpose of this action is to improve the sanitation and purification of the Western District System in Tenerife, and to resolve the problems of non-compliance with the Directive on water protection 91/271 / CEE, as well as the regeneration of water treated residuals to allow reuse. It will be carried out, through the construction of a system of collectors in the midlands and a new regional WWTP that would collect and treat waste, as well as a coastal system and an ETBAR in Playa de San Juan that would collect waste, treat and boost it to the new WWTP.