In 1933, Samuel Blanc created a funny‑looking sewer cleaning machine from a 1/6 HP Maytag washing machine motor, roller skate wheels and 3/8" cable to turn the blades. The device used a combination of special blades or "knives" to cut tree roots out of sewer lines. No digging was required. A year later, Sam's wife Lettie christened the prototype the "Roto-Rooter."

Founded in 1935, Roto-Rooter is the largest provider of plumbing and drain cleaning services in North America. In 1980, the Blanc family sold Roto-Rooter to Cincinnati-based Chemed Corporation, and Roto-Rooter moved its headquarters to Cincinnati, as well. In 1986, Roto-Rooter was spun off as a public company, with Chemed retaining majority ownership. In August 1996, Roto-Rooter again became a wholly owned subsidiary when Chemed bought back all outstanding shares.