In this study, we present new data from the ancient Maya site of Yaxnohcah in southern Mexico. These data, which are drawn from lidar-based GIS analysis, field inspection, and the excavation of two small, closed depressions, suggest that many of this site's features served a dual function. Quarrying to extract construction materials left behind closed depressions that were then sealed to create household reservoirs. We classify these water-storage features as quarry-reservoirs. The ubiquity of these small quarry-reservoirs represented an important community water source outside the sphere of direct elite control.