Dawn Dugan specializes in writing books, articles, white papers, reports and special communications for the human resources industry. She is the co-author of Effective Executive Compensation, which was published by AMACOM in 2008. Read more...
Median annual salary: $40,334
Plumbers have to unblock a lot of bath drains and toilets, while hoping the thing causing the blockage is something more like a tennis ball instead of--well, you know. But all too often, it isn't.
Fortunately, plumbers also spend a good amount of time on "cleaner" endeavors, such as installing plumbing and water supply networks, ensuring clean drinking water and installing and fixing heating systems.
Some states require certification, an apprenticeship, or both.