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Abstract
The USDA’s 2019 Survey of Irrigation Organizations provides information on the quantities of water supplied to and delivered by irrigation water delivery organizations. This report examines these delivery organizations inflows and outflows and the extent of water transfers both within and across delivery organizations. Inflows to irrigation water delivery organizations make up nearly half of the average surface freshwater withdrawals in the United States and are especially important in more arid western regions. Much of the water flowing into delivery organizations’ systems comes from Federal water projects or is directly withdrawn from natural surface water bodies. Most water delivered by organizations goes to farms and ranches, with the remainder going to municipalities and domestic or other users. Among those organizations engaging in water transfers in 2019, transfers between water users within an organization were more common than external transfers (leases) between delivery organizations and other organizations or entities. However, since external transfers tend to be large quantities of water, the total amount of water transferred by users within organizations was smaller than the total water leased by organizations.