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There was a story on TIME claiming that plumbers can make up to 250k: "Americans want and need working pipes, just like they want and need their trash collected every few days — sanitation being another service always in demand by consumers and not always in demand by job-seekers, and typically pretty well paying as a result. That said, a plumber's earnings vary widely depending on the region in which they work and whether a plumber owns a business that employs others. Journeymen in cities such as New York, Chicago, Los Angeles and Boston are in higher demand and command higher prices — up to about $250,000 a year." [1]

[1] http://www.time.com/time/nation/article/0,8599,1851673,00.ht...