Excavations at the Late Classic Maya site of Cancuen (Petén Department, Guatemala) uncovered a small-scale hydraulic system including stone-lined canals and reservoirs within the architectural core of the site. The abundance of other nearby potable water sources along with the elaborate form of the system demonstrate that it served an ideological rather than practical function. Artifacts deposited in the reservoirs support this interpretation. Moreover, the reservoir located in front of the site's royal palace contained the remains of at least 30 individuals who may represent members of the royal court massacred during the site's collapse. This paper reports the animal remains found within the site's reservoirs to further explore the nature and extent of ritual and disposal activities within these aquatic contexts. Inter- and intrasite comparisons are used to contextualize the results within broader discussions of how we identify ritual activity in the zooarchaeological record, and the role of water in ancient Maya ideological and political systems.