The Terraio reservoir was built in 1963 at about 870 meters above sea level and serves the small town of Marroneto by gravity. It has a total accumulation volume of 70 cubic meters and is divided into 2 tanks of the same size fed in series. Like other Amiata villages, the settlement of Marroneto also owes its birth to the presence of water.

Built in 1963, the Marroneto reservoir (commonly called “del Terraio”) was  built to serve the inhabited centre of the mountain village. It is located at 871 meters above sea level and by gravity it manages to guarantee the branching of the waters to the families who live in this small mountain village. The basement  reservoir has a total accumulation volume of 70 cubic meters and is divided into 2 reservoirs of equal size fed in series. As well as the other villages that have risen on the slopes of Mount Amiata, the settlement of Marroneto is due precisely to the rich presence of water, which flows out here abundantly. Further downstream around the homonymous and characteristic springs, seven other hamlets have developed: case Raspini, case Tonini, Gretini, Mormoraio, Soana, case Bigi and case Baciacchi. The presence of water, even in this corner of the mountain, is synonymous with life and health.