A plumbing foreman typically works in construction or maintenance and supervises a team of plumbers or other personnel. As a plumbing foreman, you are both a journeyman plumber and supervisor. Your duties cover supervising the assembly and repair of plumbing systems, such as water delivery systems, landscaping sprinklers, interior fire sprinklers, and drainage and wastewater disposal. Knowledge of residential, commercial, and industrial plumbing is helpful for work on a variety of job sites. Plumbing foreman responsibilities involve supervising a crew of employees, delegating tasks as necessary, communicating with site staff and management, diagnosing plumbing problems, and tending to all necessary equipment.