America needs more plumbers, and Gen Z is answering the call. Long beset by a labor crunch, the skilled trades are newly appealing to the youngest cohort of American workers, many of whom are choosing to leave the college path. Rising pay and new technologies in fields from welding to machine tooling are giving trade professions a face-lift, helping them shed the image of being dirty, low-end work. Growing skepticism about the return on a college education, the cost of which has soared in recent decades, is adding to their shine. Enrollment in vocational training programs is surging as overall enrollment in community colleges and four-year institutions has fallen.