Minn. Stat. § 473.157

To help achieve federal and state water quality standards, provide effective water pollution control, and help reduce unnecessary investments in advanced wastewater treatment, the council shall adopt a water resources plan that includes management objectives for watersheds in the metropolitan area. The council shall recommend to the Board of Water and Soil Resources performance standards for watershed plans in the metropolitan area, including standards relating to the timing of plan revisions and proper water quality management.