Water & Sewer

The City of Sioux City Zenith Water Treatment Plant was built in 1972 and updated in 1994, 2004 and 2012. It has a capacity of 30 million gallons per day (MGD). The Zenith Plant is a conventional filter plant. The Southbridge Regional Water Treatment Plant was constructed in 2010 with an initial capacity of 10 MGD expandable to 30 MGD. The Southbridge Plant is a Membrane filter Plant. On average Sioux City treats 13.75 MGD with a peak demand of 28.2 MGD. There are approximately 470 miles of distribution piping in the water system, which is made up of 5 pressure Zones. Three of these zones are increased pressure thru use of five booster stations and one is a reduced pressure zone using two pressure reducing valves. The water system has 8 storage tanks/reservoirs which hold approximately 31 million gallons of storage.