Great Lakes from Space

Welcome to is a collaboration between the United States Environmental Protection Agency and Environment Canada to provide a single window on joint work undertaken by the Governments of the United States and Canada in support of achieving the purpose of the Great Lakes Water Quality Agreement.

The Great Lakes are the largest system of fresh surface water on earth, containing about 21% of the total global resource. The Great Lakes basin covers an area of more than 765,000 square kilometres (295,000 square miles), and is home to 39 million people.

Originally signed in 1972, the Canada-United States Great Lakes Water Quality Agreement has fostered cooperation towards the protection and restoration of this important resource. The Agreement was recently amended in 2012.

The Great Lakes Water Quality Agreement promotes advancement in areas of concern, lakewide management, and science;  as well as targeted commitments to address legacy and emerging issues such as aquatic invasive species, climate change impacts, nutrients, chemicals and other environmental concerns related to Great Lakes water quality.