Plumbing Engineering responsibilities overlap into the professional engineering areas of Civil Engineering, Mechanical Engineering, Chemical Engineering, Fire Protection Engineering, and Process Engineering. Traditionally the Plumbing Engineer performs the calculations, sizes the equipment, and prepares the plumbing design and construction documents under the supervision of a licensed Mechanical, Fire Protection or Civil, Professional Engineer.

In most states the Mechanical Engineer supervises the Plumbing Engineers' responsibilities in the following areas: (61G15, Florida Administrative Code)

  • Design of Process and Fluid Flow Systems
  • Design of Plumbing Systems
  • Design of Heat and Energy Transfer Systems

The Plumbing Engineer supports the Civil Engineer for the plumbing systems outside the building including storm water, sewer, natural gas, fire suppression water, domestic water, irrigation water, and other special water and waste systems.