A study on bio fuels and water published by the Institute for Agriculture and Trade Policy (IATP) provides the following estimate: 
For Iowa, in the heart of corn production in the U.S., the water use (associated with crop water requirement) for producing a gallon of ethanol has been calculated to be between 1081 and 1121 gallons of water. However in fully irrigated agriculture, crop water use increases substantially.
For example for corn grown in Southwestern part of Nebraska, where it is irrigated, the average water use (associated with crop water requirement) for producing a gallon of ethanol has been estimated to be about 1568 gallons of water.
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