Top 30 fastest-growing jobs by 2020
9. Plumbers, pipefitters, and steamfittersProjected increase in 2020: 45.4 percent
Number employed in 2010: 57,900
Median pay in 2010: $26,740
Education/training: Employer apprenticeships or technical schools and community colleges.
Job outlook: A growing emphasis on water conservation will require retrofitting. New construction is also spurring growth.