Assessing the adequacy of water pressure, among residents of a home, is often a case of perspective. I have seen people, used to a well system out in rural Bellingham or Whatcom county, move into a city home that had marginal pressure, per city standards, and they were thrilled. Other times, I have seen people look upon what I considered to be adequate pressure as poor pressure. It is all relative to what you are accustomed to.
Despite my saying it is relative, there are tests, and parameters, for pressure -- done with a simple water pressure gauge. The gauge above is showing water pressure over 120 PSI. That is high. Standard plumbing guidelines state that water pressure should run between 40 PSI and 80 PSI. Once it hits around or over 80, I give people the basic norms for water pressure and suggest that they contact a plumber. Pressure that is too high can shorten the lifespan of some appliances, valves, etc. At the other end, low pressure really does become relative and a matter of preference. It is not going to hurt anything, but it might also mean poor flow at sinks, showers, hoses, etc.
Typically, the ideal pressure at a one-story house is about 50 PSI and when you add on more floors, also, add about 5, or a bit more, PSI per floor.