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Great Lakes Article:

Statistics about Great Lakes water use
Duluth News Tribune (MN)
Published October 25th, 2004

System contains estimated 6 quadrillion gallons of water, about 20 percent of world's fresh surface water and 90 percent of U.S. supply.

About 1 trillion gallons withdrawn from system daily; about 2.5 billion gallons consumed and not returned.

Ontario accounts for 27 percent of Great Lakes water consumption, followed by Michigan (21); Wisconsin (20); Indiana (7); New York, Quebec, Ohio (6 each); Illinois (4); Minnesota (2); Pennsylvania (less than 1).

Irrigation accounts for 29 percent of consumption, followed by public water supplies (28), industry (24), electric power plants (12), self-supplied domestic use (4) and livestock watering (3).

Water diverted from Great Lakes basin at Chicago and several other cities, but combined they are less than amount diverted into Lake Superior from Albany River system in Ontario.

Sources: International Joint Commission, Great Lakes Commission

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