Upstream from St. Paul, the Minneapolis Water Works is engaged in an even more expensive capital investment. The utility, which also draws its water from the Mississippi, supplies water for Minneapolis and seven suburbs. It recently opened a new ultrafiltration plant in Columbia Heights capable of processing between 40 million and 75 million gallons a day, depending on the time of year (in winter, the water is colder, and therefore denser, slowing down filtration time). The utility also operates an older treatment plant in Fridley that can process about 125 million gallons per day. MORE »