This article describes a study undertaken by the authors to determine what fraction of total per capita water consumption in growing southwestern Sunbelt cities is made up of water used by residential evaporative coolers. Water use was metered in sample homes during two cooling seasons. Meters were placed on incoming lines that provided makeup water to the evaporative cooler reservoir. Monitoring devices were configured to capture and meter the bleedoff water so water consumption for evaporation could be separated from total water delivered to the cooler. The study provided information about water consumption by residential evaporative coolers, bleedoff system (BS) water volumes and disposition, and statistical treatment of data on cooler water use from the two combined cooling seasons. Includes 13 references, tables, figures.