Historically about the plumbers by Wikipedia
Wikipedia provides us with brief history of the plumbers:
The word "plumber" dates from the Roman Empire. The Latin for lead is plumbum. Roman roofs used lead in conduits and drain pipes and some were also covered with lead, lead was also used for piping and for making baths. In medieval times anyone who worked with lead was referred to as a plumber as can be seen from an extract of workmen fixing a roof in Westminster Palace and were referred to as plumbers "To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead, and about various defects in the roof of the little hall". Thus a person with expertise in working with lead was first known as a Plumbarius which was later shortened to plumber.
The pipes, whole drainage system, is such an essential thing nowadays, that we rarely even think about it. Until it breaks of course. Than it is the only thing on our minds - mostly because water isn't the best thing for your furniture and flooring.
It is good to have trusted plumber in times like this, but what if he isn't available? There are some times when you need somebody ASAP, and one man business isn't going to come to your aid. Emergency plumbing services is the answer ? company with more than one plumber, on standby.
All in all, it all comes to trust either way ? You need reliable emergency plumbers. But they all usually have what it takes, to fix your water issues. Besides, it's not like you won't try anyway ? right?
encyclopedically about plumbing - Wikipedia
Wikipedia tells us a little about what plumbing really is:
Plumbing is the system of pipes, drains, fittings, valves, and fixtures installed for the distribution of potable water for drinking, heating and washing, and waterborne waste removal. "Plumbing" also refers to a skilled trade which deals with installation and maintenance.
The plumbing industry is a basic and substantial part of every developed economy. The word derives from the Latin plumbum for lead, as the first effective pipes used in Roman era were lead pipes.
"Plumbing" often denotes the supply and waste system of an individual building, distinguishing it from water supply and sewage systems that serve a group of buildings.