Leon C. Landis, Inc. is a full service plumbing, heating, air conditioning and fuel delivery company located in Quarryville, Pennsylvania. Founded in 1950, by Leon C. Landis, the company is owned and operated by Robert Landis, Jr., grandson of the founder. Landis serves southern Lancaster, southern York, southern Chester Counties and areas surrounding Lancaster, Pennsylvania.

They provide sales, service and installation of plumbing, plumbing fixtures, heating and air conditioning systems including geo thermal, heat pumps and propane furnaces and fireplaces. The company offers 24-Hour Emergency Service to its customers.