Plumbers are skilled professionals who are trained to install and maintain pipes and systems for drinking water, sewage and drainage. They usually have trained through four- to five-year training programs, which include apprenticeships, via trade schools and community colleges. Plumbers’ areas of expertise typically go beyond pipes to include mathematics, blueprint reading, plumbing codes and water distribution. They handle plumbing emergencies, such as broken pipes or clogged drains, and install and maintain everything from a new piping system to a replacement faucet. Plumbers also know how to install bathtubs and showers, toilets, water heaters and dishwashers. Plumbers may work on residential or commercial sites, sometimes designing and laying out a pipe system during construction.