Know the standards for water pressure at the entrance to the apartment you need every owner. If this norm is not met, then it is possible to raise the question of the low quality of the provided service( water supply), for which we pay quite even "qualitatively".However, do not confuse the water inlet pressure with the tap water pressure.
It should start with the fact that the water is supplied to the house by the water supply organization, and already inside the house, using engineering communications, is divorced on the entrances, risers and brought to each apartment. The norms have been reviewed countless times, and even officials are sometimes confused, trying to explain. Sometimes all "piled into a bunch."The fact is that such a rule exists separately in each region, and it depends on many factors - for example, the number of floors in the house and the number of apartments( that is, "consumers"), from the floor where the apartment is located. Therefore this figure is quite individual. Moreover, it is not known how many cranes are open at the moment throughout the house.
Nevertheless, the approximate water pressure in the aqueduct of the apartment can still be learned - one should be guided by such a figure. The water pressure from the mixer should not be less than 2 atmospheres - then the water will go from the tap normally. However, the permissible pressure in the water supply system is 6 atmospheres. More pressure can "break" the weak points in the system.2 atmosphere is enough for the washing machine, dishwasher.
If you are not satisfied with the pressure of water, then first determine in general - who is to blame? You need to ask neighbors on the landing, like they do. If the neighbors have everything in the norm, then the water is fed normally into the house. After that, you need to inquire about the water pressure in the neighbors on the riser - from below and from above. Then it will be clear - a malfunction in the riser or in the apartment. Can be "guilty" pipes, inlet filter, inlet valve( does not fully open the passageway).It is necessary to compare the pressure of water in different rooms of the apartment( kitchen, bathroom, a drain tank in the toilet).
Finally an interesting video on how to make a simple device for measuring water pressure:
