The major categories of plumbing systems or subsystems are: potable cold and hot tap water supply plumbing drainage venting sewage systems and septic systems with or without hot water heat recycling and graywater recovery and treatment systems Rainwater, surface, and subsurface water drainage fuel gas piping hydronics, i.e.
heating and cooling systems utilizing water to transport thermal energy, as in district heating systems, like for example the New York City steam system.Źródło: https://en.wikipedia.org/wiki/Plumbing
There are often such failures, which for a long time to hinder the normal functioning and cause many other problems, but some of them are too small and can be quickly repaired.
It is important, however, that even the smallest failure to call the appropriate professionals, because even if something on the surface it seems to us trivial, inadequately repaired, can result in a much higher failure and pretty large problems.
It is so much simpler, cheaper and better solution than self-repair..