Founded in 1935, Roto-Rooter is North America's largest plumbing, drain cleaning, and water cleanup services provider. In 1980, the Blanc family sold Roto-Rooter to Chemed Corporation, and Roto-Rooter moved its headquarters to Cincinnati but continued to manufacture the famous Roto-Rooter drain cleaning machines, cables, blades and other parts at its own factory in West Des Moines, Iowa.