The highest paid type of plumber is generally one who has a lot of experience and expertise in a particular area of plumbing, such as plumbing for high-rise buildings, hospitals, industrial facilities, or other specialized settings. Plumbers who own their own businesses or have advanced training in a specific area may also command higher salaries. Additionally, plumbers who work in cities with a higher cost of living or in states with higher median incomes may earn higher salaries than those who work in other areas. In general, the more specialized a plumber’s skills and experience are, the higher their salary is likely to be.