This study was initiated to quantify and update values used by the swine industry and regulatory authorities for water consumption and waste production for swine operations using modern management practices. A second objective was to apportion total water usage and total waste production into components according to stage of production and function. Nine swine operations of similar design and management practices, but representing a cross section of herd sizes were selected and monitored for approximately 18 months. The following conclusions were drawn from the data collected: Total water use for all production phases and functions averages 89.5 litres/sow/day, eighty percent of total water use was for animal drinking, with the remainder used for animal cooling (10 a