Minn. Stat. § 412.013

Any statutory city containing within its limits a plant for the concentration of taconite, either under construction or in operation, by resolution of its council may lease or purchase from the owners thereof sewer or water facilities or both and operate the same. Any such lease made by such city prior hereto, by action of the council, is hereby validated and such city may continue to provide sewer and water services to its inhabitants thereunder.