Statistics about Great Lakes water
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• About 1 trillion gallons withdrawn from system daily;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
Sources: International Joint Commission, Great Lakes