Purapurani Aquifer is a natural reservoir of underground water extending across the Bolivian municipalities of El Alto, Laja, Pucarani and Viacha in the Altiplano. [1] The aquifer has its recharge area in its northern fringes. [2] The water supply of La Paz, El Alto and Viacha depends on the aquifer. [3] Some of its shallow waters in the north are contaminated. [3]