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.
Plumbing reached its early apex in ancient Rome, which saw the introduction of expansive systems of aqueducts, tile wastewater removal, and widespread use of lead pipes. With the Fall of Rome both water supply and sanitation stagnated—or regressed—for well over 1,000 years. Improvement was very slow, with little effective progress made until the growth of modern densely populated cities in the 1800s. During this period, public health authorities began pressing for better waste disposal systems to be installed, to prevent or control epidemics of disease. Earlier, the waste disposal system had merely consisted of collecting waste and dumping it on the ground or into a river. Eventually the development of separate, underground water and sewage systems eliminated open sewage ditches and cesspools.
When a person has a blockage in their sewage system they often try to fix it themselves by adding an acid or a base such as Drano in an attempt to dissolve or dislodge the problem. These chemicals can get into the plumbers eyes when the sewage is splashed during the repair. The plumbers skin during the repair does come into contact with the sewage water. The owner of the toilet might not report to the plumber they have already tried Drano a highly caustic base .