The city of Valdivia obtains most of its water supply from Calle-Calle River near Cuesta Soto. Decreasing precipitation has caused the river to be contaminated with saline water from the coast.
Valdivia's main source of water is the Calle-Calle River, located close to Cuesta Soto. Unfortunately, reduced precipitation has resulted in the river becoming polluted with seawater.