Water tower, Plaza de Castilla, Madrid, Water tank in Plaza de Castilla, Madrid, Spain

The water tower at Plaza de Castilla is a cylindrical structure that stores water and regulates pressure for the surrounding district. It stands freely within the plaza, where its form creates a clear focal point in the urban landscape.

The second elevated deposit of the Canal de Isabel II was built in 1939 next to the fourth deposit of Plaza de Castilla, with a capacity of 3,800 m³ and a height of about 40 m above ground. It was replaced in 1952 by the current Plaza de Castilla deposit, which holds 180,000 m³. The area was remodeled at the beginning of the 21st century.

The tower belongs to the Canal de Isabel II, Madrid's water utility, and is known as the second elevated deposit. It was built next to what had been the fourth deposit of Plaza de Castilla, on municipal land, and in 1952 it was superseded by the current Plaza de Castilla deposit.

The plaza is easily reached by metro from various parts of the city with multiple lines serving the station directly. The location is walkable and situated in a busy commercial district with shops and restaurants nearby.

The 1939 tower holds 3,800 m³ and rises about 40 m above ground, a smaller companion to the first elevated deposit built between 1907 and 1911 on Calle de Santa Engracia by Diego Martín Montalvo, Luis Moya Idígoras and Ramón de Aguinaga. It was superseded in 1952 by the Plaza de Castilla deposit, whose 180,000 m³ capacity occupies the site of the former fourth deposit.