The Wasserstube was presumably established only in the 15th century and – like the former castle well in the inner courtyard of the complex – served the water supply of the castle’s inhabitants. It consists of a masonry-built chamber with a depth of approximately eight metres and a water level fluctuating between two and three metres, depending on weather conditions. The Wasserstube is fed by the so-called Schwitzwasser and by water seeping from the rock; according to tradition, this water source has never dried up.

Around the beginning of the 18th century, a so-called wash and bake house was added in front of the Wasserstube, serving the residents of the town of Leuchtenberg. As the name suggests, this communal building was used for washing and baking. Its immediate proximity to the Wasserstube was advantageous, as both activities required water and the town itself suffered from an insufficient water supply at the time. Around 1889, the building was left to decay and gradually disappeared.