The Metropolitan Council may enter into agreements with other governmental bodies and agencies and spend funds to implement total watershed management. “Total watershed management” means identifying and quantifying at a watershed level the (1) sources of pollution, both point and nonpoint, (2) causes of conditions that may or may not be a result of pollution, and (3) means of reducing pollution or alleviating adverse conditions. The purpose of total watershed management is to achieve the best water quality for waters of the state receiving the effluent of the metropolitan disposal system for the lowest total costs, without regard to who will incur those costs.