This Sept. 12, 2012 photo shows a water purifying lagoon the Archer Daniels Midland company plant in Decatur, Ill. While companies in the Great Lakes region and other parts of middle America long counted on water being cheap and plentiful, they now realize they must conserve because finding new water sources is difficult and expensive - if it can be done at all. (AP Photo/Seth Perlman)

Associated Press
This Sept. 12, 2012 photo shows a water purifying lagoon the Archer Daniels Midland company plant in Decatur, Ill. While companies in the Great Lakes region and other parts of middle America long counted on water being cheap and plentiful, they now realize they must conserve because finding new water sources is difficult and expensive - if it can be done at all. (AP Photo/Seth Perlman)
This Sept. 12, 2012 photo shows a water purifying lagoon the Archer Daniels Midland company plant in Decatur, Ill. While companies in the Great Lakes region and other parts of middle America long counted on water being cheap and plentiful, they now realize they must conserve because finding new water sources is difficult and expensive - if it can be done at all. (AP Photo/Seth Perlman)
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