The urban cores of Sound Parc, Sandbank dén Castell, Top Grossa, Coves Noves, Na Macaret and Port Addaia, placed all of them to the North-East of the municipal area of Is Mercadal, they purify the waste water by means of individual septic tanks and with small filter systems._x000D_ The object of the action is the construction of the new one EDAR in Addaia, the conductions that transport the waste water up to a new EDAR and an ocean outfall that sends the waters treated to the sea.