Water Consumption comes from a lake, reservoir, river or a groundwater aquifer via wells. Individually, we consume 80 to 100 gallons per day and the typical household 400/day. A Community Growth Management Plan determines the quantity of water that can be safely withdrawn from all sources under drought conditions; the available supply must then be compared with current demand as well as that with anticipated growth. If demand comes too close to supply, then the plan must recommend actions to offset a shortage.