Mass tourism, which has traditionally been associated with an unsustainable use of natural resources and intensive land use, is frequently identified as a major environmental stressor in coastal regions. Nonetheless, mass tourism resorts typically have a compact and vertical urban configuration and have been shown to make more efficient use of water resources than other low-density tourist destinations. This article investigates how the main variables identified by the literature as determinants of water consumption by hotels influences water efficiency in hotels in Lloret de Mar, a well-known mass tourism destination on the Costa Brava in Spain. The results of a generalized linear mixed model show that large, high-rise hotels that attract thousands of tourists annually also benefit from economies of scale in terms of water efficiency