The research focuses on the Water Festival (Yarqa Aspiy), an ancient event in the Peruvian Andes, and which, as an Inca activity, survived the extirpation of idolatries by the Spanish colonization. The objective is to determine the importance of ancestral rituals in the communal work of this festival that, by merging with those of the Catholic religion, survives to this day. The participant-observation methodology in the Ccarhuaccoco community allowed us to investigate the details of this ancestral communal activity with its Andean rituals. It is concluded that this activity of Inca origin is in the process of extinction due to the growth of the Evangelical Church, which eradicates idolatry in its community practice. Additionally, thanks to religious tolerance, freedom of belief, and the necessary coexistence of water with the community, the festivity is maintained, although with variations in its ritual.