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Groundwater is Nebraska's most important natural resource. The principal source of groundwater in Nebraska is the High Plains Aquifer System. This system underlies approximately 85 percent of the state and supplies 95 percent of all groundwater used in Nebraska. The majority of groundwater in Nebraska is used by agriculture but domestic and commercial uses are also important. Eighty-two percent of Nebraskans use groundwater as their major source of drinking water, and nearly all of the state's farm homes rely on groundwater for their domestic needs.