DeLuca Plumbing, L.L.C. was founded in 1938 as a St. Louis Union Plumbing Company mainly focused on the business of plumbing, sewer work, gas fitting, and heating repairs by Peter L. DeLuca, the founder of DeLuca Plumbing. He then passed control of the company to John B. DeLuca, Master Plumber, who became President. In 1996, John DeLuca, Jr. received his Master Plumbing Contractors License to perform plumbing work throughout the St. Louis Metropolitan Area and the State of Florida.