Firstly, the reason due to which the plumbers have to be called is tree root problem. This problem, is caused because the drainage pipes that are laid down are in the reach of these roots, sensing water movement in these pipes the roots starts probing these pipes and growing thicker around them and over time, if these roots become enough thick then they can break through the drainage pipe walls to get water, thus causing blockage of the flow of the water, or leaking of the water in the area, so the professional are called who analyze the problem and takes steps accordingly to solve the problem. Secondly, blocked drain is quite a big problem. These drain pipes can get blocked due to several reasons, like pile up of hair in the bath and sink plugholes or fat and grease is poured down the sink, causing the fat to get encrusted on the sides. This reduces the flow of the water and water borne wastes, thus clogging the drain pipes. Moreover, sometimes people carelessly, flush away things that are not supposed to be flushed away, like plastic wrappers, soaps, baby diapers etc these things tend to block the pipes and stop the flow of waste through them. This phenomenon is much more common than one thinks. So solve this problem professionals are called as they have the specific tools to clear away the clogs.
Thirdly, leaking taps is a major problem. With the passage of times, the washers and Teflon tape inside the taps gets worn out and as a result water starts to seep out. If this problem isnt taken care of then quite a large amount of water is lost from the leak, as with the passage of time, the leak will worsen. This constant leakage may also damage the toilet as it may step in to the walls or floor of the toilet causing major problem. Fourthly; there is a case of leaking toilet tanks, due to some problem or damage inflicted on the tank, the water starts to leak from them and it can result in huge loss of water. Fifthly; rusted and old water pipes is also one of the reason to call a professional. Over time the pipes get rusted or corrode away, as a result the water start leaking away, so either to repair the pipe, or to replace it, professional help is needed, otherwise it cannot be done individually.
These are some of the reasons mentioned because of which we need the plumbing service. There are a number of other reasons to out there, because of which one might need a professionals help, so it is necessary to have plumbing services to solve these problems and keep the plumbing condition perfect, as not every problem can be dealt with individually.