Rochester, MN (KROC-AM News) - Low water levels in a Twin Cities lake have prompted an unprecedented study of southeastern Minnesota's drinking water supplies. At that rate of growth, the city is projected to exceed its current capacity to meet the demand for water by 2031. RPU RPUCould the Zumbro and Mississippi Rivers Supply Rochester? It will also study the potential for pulling water out of the Zumbro and Mississippi rivers to meet the community's growing demand for water. The municipal utility says that data will form "the foundation for extensive capital planning for water supply, treatment, and distribution."