… the U.S. and Canadian governments deems Ontario fair, … Water Quality Agreement between Canada and the United States … by the United States and Canada in Niagara Falls, Ont., … chemicals; wetlands and native species; nutrients; non-native and invasive species; …… the U.S. and Canadian governments deems Ontario fair, … Water Quality Agreement between Canada and the United States … by the United States and Canada in Niagara Falls, Ont., … chemicals; wetlands and native species; nutrients; non-native and invasive species; …