Boundary Waters Treaty
Prior to 1909, there was no bilateral international agreement between Canada and the United States pertaining to the diversion, uses and/or pollution of waters along their shared borders of the Great Lakes. Thus there were, for the most part, no rules.
The two countries soon recognized the problems associated to this lack of control and regulation and began negotiations to remedy the problem.
The first treaty designed to maintain and control the water in the Niagara River.
The second and current treaty that is in place for the two different countries along the Niagara River.