In May 2000 , a 25 mgd facility , the Water Treatment Plant at Maffitt Lake , renamed the L.D. McMullen Water Treatment Plant in 2007 , began operation using five radial collector wells as its main source , and additionally also from Maffitt Reservoir . In August 2003 , a monthly pump record was set at 2,262.82 million gallons . In June 2006 , ground was broken for a third treatment plant with a capacity of 10 mgd , the Saylorville Water Treatment Plant , using membrane technology to soften and purify the water . In June 2006 , a daily pumpage record of 90.19 mg was set . During the Iowa flood of 2008 , the Raccoon River crested at 12.5 feet above flood stage , but DMWW operated normally due to levee work and flood preparation
Iowa flood of 2008
Iowa flood of 2008
Des Moines Water Works